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Prof. Hideki Hosoda
Institute of Innovative Research, Tokyo Institute of Technology, Yokohama 226-8503, Japan

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0 Biomaterials
0 Mechanical Properties
0 Intermetallics
0 Physical Metallurgy
0 alloy design

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Shape memory and superelastic alloys
Mechanical Properties
phase stability
alloy design
Biomaterials
Intermetallics
Microstructural control

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Review
Published: 21 June 2021 in Electrochem
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A comprehensive review of the electroactive materials for non-enzymatic glucose sensing and sensing devices has been performed in this work. A general introduction for glucose sensing, a facile electrochemical technique for glucose detection, and explanations of fundamental mechanisms for the electro-oxidation of glucose via the electrochemical technique are conducted. The glucose sensing materials are classified into five major systems: (1) mono-metallic materials, (2) bi-metallic materials, (3) metallic-oxide compounds, (4) metallic-hydroxide materials, and (5) metal-metal derivatives. The performances of various systems within this decade have been compared and explained in terms of sensitivity, linear regime, the limit of detection (LOD), and detection potentials. Some promising materials and practicable methodologies for the further developments of glucose sensors have been proposed. Firstly, the atomic deposition of alloys is expected to enhance the selectivity, which is considered to be lacking in non-enzymatic glucose sensing. Secondly, by using the modification of the hydrophilicity of the metallic-oxides, a promoted current response from the electro-oxidation of glucose is expected. Lastly, by taking the advantage of the redistribution phenomenon of the oxide particles, the usage of the noble metals is foreseen to be reduced.

ACS Style

Wan-Ting Chiu; Tso-Fu Chang; Masato Sone; Hideki Hosoda; Agnès Tixier-Mita; Hiroshi Toshiyoshi. Developments of the Electroactive Materials for Non-Enzymatic Glucose Sensing and Their Mechanisms. Electrochem 2021, 2, 347 -389.

AMA Style

Wan-Ting Chiu, Tso-Fu Chang, Masato Sone, Hideki Hosoda, Agnès Tixier-Mita, Hiroshi Toshiyoshi. Developments of the Electroactive Materials for Non-Enzymatic Glucose Sensing and Their Mechanisms. Electrochem. 2021; 2 (2):347-389.

Chicago/Turabian Style

Wan-Ting Chiu; Tso-Fu Chang; Masato Sone; Hideki Hosoda; Agnès Tixier-Mita; Hiroshi Toshiyoshi. 2021. "Developments of the Electroactive Materials for Non-Enzymatic Glucose Sensing and Their Mechanisms." Electrochem 2, no. 2: 347-389.

Communication
Published: 07 June 2021 in Materials
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To enhance the mechanical properties (e.g., strength and elongation) of the face-centered cubic (fcc) α-phase in the Au-Cu-Al system, this study focused on the introduction of the martensite phase (doubled B19 (DB19) crystal structure of Au2CuAl) via the manipulation of alloy compositions. Fundamental evaluations, such as microstructure observations, phase identifications, thermal analysis, tensile behavior examinations, and reflectance analysis, have been conducted. The presence of fcc annealing twins was observed in both the optical microscope (OM) and the scanning electron microscope (SEM) images. Both strength and elongation of the alloys were greatly promoted while the DB19 martensite phase was introduced into the alloys. Amongst all the prepared specimens, the 47Au41Cu12Al and the 44Au44Cu12Al alloys performed the optimized mechanical properties. The enhancement of strength and ductility in these two alloys was achieved while the stress plateau was observed during the tensile deformation. A plot of the ultimate tensile strength (UTS) against fracture strain was constructed to illustrate the effects of the introduction of the DB19 martensite phase on the mechanical properties of the alloys. Regardless of the manipulation of the alloy compositions and the introduction of the DB19 martensite phase, the reflectance stayed almost identical to pure Au.

ACS Style

Kang-Wei Goo; Wan-Ting Chiu; Ayano Toriyabe; Masahiro Homma; Akira Umise; Masaki Tahara; Kenji Goto; Takumi Sannomiya; Hideki Hosoda. Mechanical Properties Enhancement of the Au-Cu-Al Alloys via Phase Constitution Manipulation. Materials 2021, 14, 3122 .

AMA Style

Kang-Wei Goo, Wan-Ting Chiu, Ayano Toriyabe, Masahiro Homma, Akira Umise, Masaki Tahara, Kenji Goto, Takumi Sannomiya, Hideki Hosoda. Mechanical Properties Enhancement of the Au-Cu-Al Alloys via Phase Constitution Manipulation. Materials. 2021; 14 (11):3122.

Chicago/Turabian Style

Kang-Wei Goo; Wan-Ting Chiu; Ayano Toriyabe; Masahiro Homma; Akira Umise; Masaki Tahara; Kenji Goto; Takumi Sannomiya; Hideki Hosoda. 2021. "Mechanical Properties Enhancement of the Au-Cu-Al Alloys via Phase Constitution Manipulation." Materials 14, no. 11: 3122.

Preprint
Published: 24 May 2021
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To enhance the mechanical properties (i.e. strength and elongation) of the face-centered cubic (fcc) α-phase in the Au-Cu-Al system, this study focused on the introduction of the martensite phase (doubled B19 (DB19) crystal structure of Au2CuAl) via the manipulation of alloy compositions. Fundamental evaluations, such as microstructure observations, phase identifications, thermal analysis, tensile behavior examinations, and reflectance analysis have been conducted. The presence of fcc annealing twins was both observed in the optical microscope (OM) and the scanning electron microscope (SEM) images. Both the strength and elongation of the alloys were greatly promoted while the DB19 martensite phase was introduced into the alloys. Amongst all the prepared specimens, the 47Au41Cu12Al and the 44Au44Cu12Al alloys performed the optimized mechanical properties. The enhancement of strength and ductility in these 2 alloys was achieved while the stress plateau was observed during the tensile deformation. A plot of the ultimate tensile strength (UTS) against fracture strain was constructed to illustrate the effects of the introduction of the DB19 martensite phase on the mechanical properties of the alloys. Regardless of the manipulation of the alloy compositions and the introduction of the DB19 martensite phase, the reflectance stayed almost identical to pure Au.

ACS Style

Kang Wei Goo; Wan–Ting Chiu; Ayano Toriyabe; Masahiro Homma; Akira Umise; Masaki Tahara; Kenji Goto; Takumi Sannomiya; Hideki Hosoda. Mechanical Properties Enhancement of the Au-Cu-Al Alloys via Phase Constitution Manipulation. 2021, 1 .

AMA Style

Kang Wei Goo, Wan–Ting Chiu, Ayano Toriyabe, Masahiro Homma, Akira Umise, Masaki Tahara, Kenji Goto, Takumi Sannomiya, Hideki Hosoda. Mechanical Properties Enhancement of the Au-Cu-Al Alloys via Phase Constitution Manipulation. . 2021; ():1.

Chicago/Turabian Style

Kang Wei Goo; Wan–Ting Chiu; Ayano Toriyabe; Masahiro Homma; Akira Umise; Masaki Tahara; Kenji Goto; Takumi Sannomiya; Hideki Hosoda. 2021. "Mechanical Properties Enhancement of the Au-Cu-Al Alloys via Phase Constitution Manipulation." , no. : 1.

Journal article
Published: 18 February 2021 in Journal of Alloys and Compounds
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Recently, the formation of the isothermal α″ phase (α″iso, orthorhombic) via aging heat treatment has been reported in several β-Ti alloys. The microstructure of the α + β dual phase that was obtained from the α″iso phase via a novel decomposition pathway (β → α″iso (single phase) → α + β) in metastable β-Ti alloys was investigated in the present study. Ex-situ X-ray diffraction measurements and scanning electron microscopy were performed to elucidate the phase constitution and the microstructural evolution, respectively, during the decomposition. The detailed microstructure of the α + β phases was observed using transmission electron microscopy. The microstructure of the α + β dual phase inherited the characteristics of the microstructure of the α″iso phase. The microstructural features included irregular-shaped variants, dense and fine twinning (width ~ 50–100 nm). The Burgers orientation relationship was satisfied between the initial β, α″iso, decomposed β, and decomposed α phases. Furthermore, only a specific variant combination of the decomposed α and β phases was observed. The crystallographic orientation (i.e., variant) of the decomposed β phase was similar to that of the initial β phase. These results indicated the existence of a strict variant selection rule between the α and β phases. The origin of this rule was the α″iso variant that was formed before the decomposition. When the Burgers orientation relationship was established, the α″iso variant determined the parallel plane and parallel direction between the α and β phases.

ACS Style

Masaki Tahara; Kazuya Hasunuma; Hideki Hosoda. Microstructure of α + β dual phase formed from isothermal α″phase via novel decomposition pathway in metastable β-Ti alloy. Journal of Alloys and Compounds 2021, 868, 159237 .

AMA Style

Masaki Tahara, Kazuya Hasunuma, Hideki Hosoda. Microstructure of α + β dual phase formed from isothermal α″phase via novel decomposition pathway in metastable β-Ti alloy. Journal of Alloys and Compounds. 2021; 868 ():159237.

Chicago/Turabian Style

Masaki Tahara; Kazuya Hasunuma; Hideki Hosoda. 2021. "Microstructure of α + β dual phase formed from isothermal α″phase via novel decomposition pathway in metastable β-Ti alloy." Journal of Alloys and Compounds 868, no. : 159237.

Journal article
Published: 01 February 2021 in AIP Advances
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Micro-pillars oriented in austenite along [100], [110], and [111] crystallographic directions were fabricated on the corresponding edges of a single crystalline plate of the Ni48Fe20Co5Ga27 magnetic shape memory alloy exhibiting martensitic transformation (MT) at 150 K. Superelastic behavior of pillars, due to micro-compression-induced MT, was investigated at different temperatures from 298 K to 373 K. At room temperature, Young’s moduli of the [100], [110], and [111] pillars in austenite are equal to 5.3 GPa, 7.9 GPa, and 9.9 GPa, respectively, resulting in the linear dependences of the elastic strain reaching up to the record-breaking value of 10%. On increasing temperature, the stress–strain dependencies exhibit changes that are interpreted in terms of the critical behavior on approaching to the end points on the martensite–austenite stress–temperature phase diagrams.

ACS Style

T.-F. M. Chang; V. Chernenko; H.-C. Tang; C.-Y. Chen; A. Umise; M. Tahara; H. Hosoda; M. Sone. Superelastic behavior of single crystalline Ni48Fe20Co5Ga27 micro-pillars near austenite–martensite critical point. AIP Advances 2021, 11, 025213 .

AMA Style

T.-F. M. Chang, V. Chernenko, H.-C. Tang, C.-Y. Chen, A. Umise, M. Tahara, H. Hosoda, M. Sone. Superelastic behavior of single crystalline Ni48Fe20Co5Ga27 micro-pillars near austenite–martensite critical point. AIP Advances. 2021; 11 (2):025213.

Chicago/Turabian Style

T.-F. M. Chang; V. Chernenko; H.-C. Tang; C.-Y. Chen; A. Umise; M. Tahara; H. Hosoda; M. Sone. 2021. "Superelastic behavior of single crystalline Ni48Fe20Co5Ga27 micro-pillars near austenite–martensite critical point." AIP Advances 11, no. 2: 025213.

Journal article
Published: 21 December 2020 in Crystals
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The aim of this study is to investigate a characteristic deformation behavior of a precipitation strengthening-type Cu-Ni-Si alloy (Cu-2.4Ni-0.51Si-9.3Zn-0.15Sn-0.13Mg) by microcompression specimens. Three micropillars with a square cross-section of 20 × 20 × 40 μm3 were fabricated by focused ion beam (FIB) micromachining apparatus and tested by a machine specially designed for microsized specimens. The three pillars were deformed complicatedly and showed different yield strengths depending on the crystal orientation. The micromechanical tests revealed work hardening by the precipitation clearly. Electron backscattered diffraction analysis of a deformed specimen showed a gradual rotation of grain axis at the grain boundaries after the compression test.

ACS Style

Sari Yanagida; Takashi Nagoshi; Akiyoshi Araki; Tso-Fu Mark Chang; Chun-Yi Chen; Equo Kobayashi; Akira Umise; Hideki Hosoda; Tatsuo Sato; Masato Sone. Heterogeneous Deformation Behavior of Cu-Ni-Si Alloy by Micro-Size Compression Testing. Crystals 2020, 10, 1162 .

AMA Style

Sari Yanagida, Takashi Nagoshi, Akiyoshi Araki, Tso-Fu Mark Chang, Chun-Yi Chen, Equo Kobayashi, Akira Umise, Hideki Hosoda, Tatsuo Sato, Masato Sone. Heterogeneous Deformation Behavior of Cu-Ni-Si Alloy by Micro-Size Compression Testing. Crystals. 2020; 10 (12):1162.

Chicago/Turabian Style

Sari Yanagida; Takashi Nagoshi; Akiyoshi Araki; Tso-Fu Mark Chang; Chun-Yi Chen; Equo Kobayashi; Akira Umise; Hideki Hosoda; Tatsuo Sato; Masato Sone. 2020. "Heterogeneous Deformation Behavior of Cu-Ni-Si Alloy by Micro-Size Compression Testing." Crystals 10, no. 12: 1162.

Journal article
Published: 25 December 2019 in Materials
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In this work, micro-compression tests are performed at various temperatures with Ti-27Nb (at.%) single crystalline pillars to investigate anisotropic deformation behavior, including the shape memory effect. In non-tapered single-crystal pillars with loading directions parallel to [001], [011], and [111], transformation strain and stress show orientation dependence. [001]-oriented micropillars with aspect ratios of 2 and 1.5 demonstrate temperature-dependent transformation stress during micro-compression at various temperatures. Although more stress is required to induce martensite transformation in the pillar with the lower aspect ratio, the temperature dependence of ~1.8 MPa/K observed in both pillars is in good agreement with that of bulk Ti-27Nb.

ACS Style

Takashi Nagoshi; Takahisa Yasuda; Nao Otaki; Masaki Tahara; Hideki Hosoda; Masato Sone. Evaluation of the Shape Memory Effect by Micro-Compression Testing of Single Crystalline Ti-27Nb Ni-Free Alloy. Materials 2019, 13, 110 .

AMA Style

Takashi Nagoshi, Takahisa Yasuda, Nao Otaki, Masaki Tahara, Hideki Hosoda, Masato Sone. Evaluation of the Shape Memory Effect by Micro-Compression Testing of Single Crystalline Ti-27Nb Ni-Free Alloy. Materials. 2019; 13 (1):110.

Chicago/Turabian Style

Takashi Nagoshi; Takahisa Yasuda; Nao Otaki; Masaki Tahara; Hideki Hosoda; Masato Sone. 2019. "Evaluation of the Shape Memory Effect by Micro-Compression Testing of Single Crystalline Ti-27Nb Ni-Free Alloy." Materials 13, no. 1: 110.

Short communication
Published: 16 September 2019 in Materials Letters
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The isothermal martensitic transformation (IMT) behavior of Ti–20Nb–0.7O (mol %) alloy was investigated via X-ray diffractometry. Isothermal formation of the α″ martensite phase was observed, and the activation energy was determined using the time-temperature-transformation diagram coupled with differential scanning calorimetry. IMT in Ti–20Nb–0.7O alloy was explained by nanometer-sized local lattice modulations (nanodomains) and diffusion of oxygen atoms in the β phase. The latter was found to be the primary rate-determining process.

ACS Style

Masaki Tahara; Tomonari Inamura; Hee Young Kim; Shuichi Miyazaki; Hideki Hosoda. Isothermal martensitic transformation behavior of Ti–Nb–O alloy. Materials Letters 2019, 257, 126691 .

AMA Style

Masaki Tahara, Tomonari Inamura, Hee Young Kim, Shuichi Miyazaki, Hideki Hosoda. Isothermal martensitic transformation behavior of Ti–Nb–O alloy. Materials Letters. 2019; 257 ():126691.

Chicago/Turabian Style

Masaki Tahara; Tomonari Inamura; Hee Young Kim; Shuichi Miyazaki; Hideki Hosoda. 2019. "Isothermal martensitic transformation behavior of Ti–Nb–O alloy." Materials Letters 257, no. : 126691.

Journal article
Published: 01 September 2019 in MATERIALS TRANSACTIONS
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ACS Style

Takayoshi Nakano; Takayuki Narushima; Takao Hanawa; Masato Ueda; Yoko Yamabe-Mitarai; Tadashi Furuhara; Hideki Hosoda; Mitsuo Niinomi. PREFACE. MATERIALS TRANSACTIONS 2019, 60, 1732 -1732.

AMA Style

Takayoshi Nakano, Takayuki Narushima, Takao Hanawa, Masato Ueda, Yoko Yamabe-Mitarai, Tadashi Furuhara, Hideki Hosoda, Mitsuo Niinomi. PREFACE. MATERIALS TRANSACTIONS. 2019; 60 (9):1732-1732.

Chicago/Turabian Style

Takayoshi Nakano; Takayuki Narushima; Takao Hanawa; Masato Ueda; Yoko Yamabe-Mitarai; Tadashi Furuhara; Hideki Hosoda; Mitsuo Niinomi. 2019. "PREFACE." MATERIALS TRANSACTIONS 60, no. 9: 1732-1732.

Journal article
Published: 01 September 2019 in MATERIALS TRANSACTIONS
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The effect of heat treatment temperature on texture formation in Ti–5.5Mo–8Al–6Zr (mol%) alloy sheets was systematically investigated in this study. α′′ martensite was induced by cold-rolling. Although the deformation texture of α′′ martensite could not be detected, the formation of {130}α′′⟨310⟩α′′ and (100)α′′[010]α′′ textures was proposed. The specimen heat-treated at 1073 K or higher consisted of a single β phase, and Goss, {110}β⟨113⟩β, and Brass orientations were formed as the recrystallization textures. The Goss orientation, which is irregular for β-Ti alloys, developed with increasing heat treatment temperature, and became the dominant component in the specimens heat-treated at 1173 K. The specimen heat-treated at 973 K consisted of the β + α phase. {113}β⟨110⟩β, {113}β⟨141⟩β, {223}β⟨252⟩β, {223}β⟨692⟩β, and {332}β⟨113⟩β were formed in the β phase, whereas {1120}α⟨1100⟩α – {1122}α⟨1100⟩α was formed in the α phase. Transmission electron microscopy observations revealed that the specimen heat-treated at 973 K was not completely recrystallized. This microstructural difference led to a difference in texture components between the specimens heat-treated at 973 K and at 1073 K or higher.

ACS Style

Yuri Shinohara; Tomoya Sasaki; Masaki Tahara; Hideki Hosoda; Tomonari Inamura. Goss Orientation Evolution in Ti–5.5Mo–8Al–6Zr Shape Memory Alloy upon Heat Treatment. MATERIALS TRANSACTIONS 2019, 60, 1890 -1897.

AMA Style

Yuri Shinohara, Tomoya Sasaki, Masaki Tahara, Hideki Hosoda, Tomonari Inamura. Goss Orientation Evolution in Ti–5.5Mo–8Al–6Zr Shape Memory Alloy upon Heat Treatment. MATERIALS TRANSACTIONS. 2019; 60 (9):1890-1897.

Chicago/Turabian Style

Yuri Shinohara; Tomoya Sasaki; Masaki Tahara; Hideki Hosoda; Tomonari Inamura. 2019. "Goss Orientation Evolution in Ti–5.5Mo–8Al–6Zr Shape Memory Alloy upon Heat Treatment." MATERIALS TRANSACTIONS 60, no. 9: 1890-1897.

Journal article
Published: 01 September 2019 in Results in Materials
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ACS Style

Pimpet Sratong-On; Volodymyr Chernenko; Hideki Hosoda. Influence of internal stress on magnetostrain effect in Ni–Mn–Ga/polymer composite. Results in Materials 2019, 2, 1 .

AMA Style

Pimpet Sratong-On, Volodymyr Chernenko, Hideki Hosoda. Influence of internal stress on magnetostrain effect in Ni–Mn–Ga/polymer composite. Results in Materials. 2019; 2 ():1.

Chicago/Turabian Style

Pimpet Sratong-On; Volodymyr Chernenko; Hideki Hosoda. 2019. "Influence of internal stress on magnetostrain effect in Ni–Mn–Ga/polymer composite." Results in Materials 2, no. : 1.

Full paper
Published: 30 August 2019 in Advanced Engineering Materials
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The microstructure of β‐metastable Ti–3Mo–6Sn–6Al (mol%) alloy is systematically investigated before and after isothermal aging. Before aging, nanosized martensite‐type lattice modulations are observed that correspond to the nanodomains reported in oxygen‐added Ti‐Nb base alloys. All six nanodomain variants are homogeneously distributed in the β phase, which suppresses the formation of macroscopic α″ martensite. An isothermal α″ phase (α″iso) forms in the parent β phase during isothermal aging. The crystal structure of the α″iso phase changes continuously during isothermal aging, approaching that of the α phase. No composition change is detected on α″iso phase formation, demonstrating that its formation is not due to precipitation or β phase decomposition. The thermally activated process required for the α″iso formation is considered to be a short‐range atomic rearrangement, which weakens the suppressive effect of nanodomains on α″ formation. However, the microstructure of the α″iso phase is different from the self‐accommodating structure of α″ martensite that forms on quenching or cooling. The α″iso phase comprises a main (matrix) variant, with all five other variants observed inside this matrix, with a size of 10–100 nm.

ACS Style

Masaki Tahara; Kazuya Hasunuma; Ryosuke Ibaki; Tomonari Inamura; Hideki Hosoda. Microstructural Evolution in β‐Metastable Ti–Mo–Sn–Al Alloy During Isothermal Aging. Advanced Engineering Materials 2019, 21, 1 .

AMA Style

Masaki Tahara, Kazuya Hasunuma, Ryosuke Ibaki, Tomonari Inamura, Hideki Hosoda. Microstructural Evolution in β‐Metastable Ti–Mo–Sn–Al Alloy During Isothermal Aging. Advanced Engineering Materials. 2019; 21 (11):1.

Chicago/Turabian Style

Masaki Tahara; Kazuya Hasunuma; Ryosuke Ibaki; Tomonari Inamura; Hideki Hosoda. 2019. "Microstructural Evolution in β‐Metastable Ti–Mo–Sn–Al Alloy During Isothermal Aging." Advanced Engineering Materials 21, no. 11: 1.

Journal article
Published: 29 August 2019 in Journal of Materials Research and Technology
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In the present work, the structural, mechanical and shape memory properties of Ni55Fe16Ga29 (at.%) melt-spun ribbons have been studied with a prospective of application in the elastocaloric devises. Particularly, a special thermo-mechanical treatment, consisting in the thermal aging under constant external stress, was elaborated to control the residual internal stress generated due to the melt-spinning processing and improve thermomechanical and superelastic responses of the ribbon. The stress-induced entropy change was evaluated for the ribbon with improved thermomechanical properties.

ACS Style

E. Villa; C.O. Aguilar-Ortiz; Adelaide Nespoli; P. Álvarez-Alonso; J.P. Camarillo-Garcia; D. Salazar; F. Passaretti; H. Flores-Zúñiga; Hideki Hosoda; V.A. Chernenko. Tailoring thermomechanical treatment of Ni-Fe-Ga melt-spun ribbons for elastocaloric applications. Journal of Materials Research and Technology 2019, 8, 4540 -4546.

AMA Style

E. Villa, C.O. Aguilar-Ortiz, Adelaide Nespoli, P. Álvarez-Alonso, J.P. Camarillo-Garcia, D. Salazar, F. Passaretti, H. Flores-Zúñiga, Hideki Hosoda, V.A. Chernenko. Tailoring thermomechanical treatment of Ni-Fe-Ga melt-spun ribbons for elastocaloric applications. Journal of Materials Research and Technology. 2019; 8 (5):4540-4546.

Chicago/Turabian Style

E. Villa; C.O. Aguilar-Ortiz; Adelaide Nespoli; P. Álvarez-Alonso; J.P. Camarillo-Garcia; D. Salazar; F. Passaretti; H. Flores-Zúñiga; Hideki Hosoda; V.A. Chernenko. 2019. "Tailoring thermomechanical treatment of Ni-Fe-Ga melt-spun ribbons for elastocaloric applications." Journal of Materials Research and Technology 8, no. 5: 4540-4546.

Journal article
Published: 28 May 2019 in Applied Energy
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Empty fruit bunch (EFB) has a high potential to be utilized as energy source. This study investigated the effects of the hydrothermal treatment and pelletizing temperature on the physical properties of the EFB pellets. EFB was hydrothermally treated using 10 m3 batch-type reactor and water washed using a centrifugal machine. Single pellet making device was used for pelletization of both treated and untreated EFB. The pellets were densified at a pressure of 60 MPa and a temperature of 100, 150 and 200 °C by using a single pelletizer. The pellet density, the compressive strength, the hydrophobicity and the durability of the produced pellets were evaluated. In addition, scanning electron microscope (SEM) was also utilized to examine the binding mechanism and its quality. The results showed that combination of hydrothermal treatment and water washing significantly improved the physical properties of EFB pellets especially, at the pelletizing temperature of 100 °C. At the pelletizing temperature of 100 °C, the pellet durability index (PDI) and compressive strength of untreated EFB pellet increased from 78.1% and 5.6 MPa to 98.72% and 15.6 MPa, respectively when compared to the treated pellet. Notable increase in pellet properties of untreated EFB were also observed as pelletizing temperature increase. At pelleting temperature of 200 °C, PDI and maximum load to 92.83% and 14.2 MPa respectively. However, only slight improvement in characteristics of the washed hydrochar pellets were observed as the pelletizing temperature increased. Finally, the energy balance in the process of EFB-to-Pellet was roughly calculated for the commercialized system, and the output energy in pellet products could reach 89.90%.

ACS Style

Sirawasith Ruksathamcharoen; Teerapong Chuenyam; Pimpet Stratong-On; Hideki Hosoda; Lu Ding; Kunio Yoshikawa. Effects of hydrothermal treatment and pelletizing temperature on the mechanical properties of empty fruit bunch pellets. Applied Energy 2019, 251, 113385 .

AMA Style

Sirawasith Ruksathamcharoen, Teerapong Chuenyam, Pimpet Stratong-On, Hideki Hosoda, Lu Ding, Kunio Yoshikawa. Effects of hydrothermal treatment and pelletizing temperature on the mechanical properties of empty fruit bunch pellets. Applied Energy. 2019; 251 ():113385.

Chicago/Turabian Style

Sirawasith Ruksathamcharoen; Teerapong Chuenyam; Pimpet Stratong-On; Hideki Hosoda; Lu Ding; Kunio Yoshikawa. 2019. "Effects of hydrothermal treatment and pelletizing temperature on the mechanical properties of empty fruit bunch pellets." Applied Energy 251, no. : 113385.

Journal article
Published: 01 May 2019 in MATERIALS TRANSACTIONS
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The compressive deformation behavior and magnetic volume susceptibility were investigated for Au2CuAl biomedical shape memory alloys in a compositional range from 25 to 45 mol%Cu. Compression tests revealed that the stress for martensite variant reorientation was 282 MPa in Au2CuAl, and the value increased with the Cu content. On the other hand, the slip stress was higher at intermediate compositions. Moreover, intergranular fracture was suppressed during compressive deformation. Calculated antiphase boundary (APB) energies suggest the dissociation of superlattice dislocation, which leads to the active slip of 〈111〉-type. The measured magnetic volume susceptibility was −2.7 × 10−6 in Au2CuAl, hence, this alloy is judged to be metal-artifact-free in magnetic resonance imaging (MRI). The magnetic susceptibility increased up to +7.0 × 10−6 with increasing Cu content.

ACS Style

Kenji Goto; Akira Umise; Masaki Tahara; Hideki Hosoda. Compressive Deformation Behavior and Magnetic Susceptibility of Au2CuAl Biomedical Shape Memory Alloys. MATERIALS TRANSACTIONS 2019, 60, 662 -665.

AMA Style

Kenji Goto, Akira Umise, Masaki Tahara, Hideki Hosoda. Compressive Deformation Behavior and Magnetic Susceptibility of Au2CuAl Biomedical Shape Memory Alloys. MATERIALS TRANSACTIONS. 2019; 60 (5):662-665.

Chicago/Turabian Style

Kenji Goto; Akira Umise; Masaki Tahara; Hideki Hosoda. 2019. "Compressive Deformation Behavior and Magnetic Susceptibility of Au2CuAl Biomedical Shape Memory Alloys." MATERIALS TRANSACTIONS 60, no. 5: 662-665.

Journal article
Published: 01 May 2019 in MATERIALS TRANSACTIONS
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The phase reaction and diffusion behavior of stoichiometric AuTi and CoTi intermetallic compounds were clarified using diffusion couple technique. It was found by scanning electron microscopy equipped with energy dispersive X-ray spectroscope that two intermetallic compounds of (Au,Co)Ti3 and (Au,Co)2Ti were produced near interface between the AuTi and CoTi when heat-treated at 1173 K and 1273 K, and that only (Au,Co)Ti3 was formed when heat-treated at 1373 K. The presence of these intermetallic compounds was explained by the concentration dependent diffusivity in the diffusion couple. With increasing the heat-treatment temperature from 1173 K to 1373 K, the thickness of the diffusion layer increased from 78 µm to 200 µm. The apparent activation energy for the layer growth was estimated as 127 kJ/mol. Furthermore, the diffusion path in the isothermal section at 1173 K–1373 K in the Au–Ti–Co system was also discussed.

ACS Style

Taywin Buasri; Kenji Goto; Masaki Tahara; Hideki Hosoda. Phase Reaction and Diffusion Behavior between AuTi and CoTi Intermetallic Compounds. MATERIALS TRANSACTIONS 2019, 60, 631 -635.

AMA Style

Taywin Buasri, Kenji Goto, Masaki Tahara, Hideki Hosoda. Phase Reaction and Diffusion Behavior between AuTi and CoTi Intermetallic Compounds. MATERIALS TRANSACTIONS. 2019; 60 (5):631-635.

Chicago/Turabian Style

Taywin Buasri; Kenji Goto; Masaki Tahara; Hideki Hosoda. 2019. "Phase Reaction and Diffusion Behavior between AuTi and CoTi Intermetallic Compounds." MATERIALS TRANSACTIONS 60, no. 5: 631-635.

Journal article
Published: 05 March 2019 in Scientific Reports
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Single crystalline Ni-Mn-Ga is well known as a prototype ferromagnetic shape memory alloy (FSMA) exhibiting a giant magnetic field-induced strain (MFIS), up to 12%, due to the magnetically driven twin boundary rearrangement. The large stroke and fast magnetomechanical response make it important for actuators and sensors. Polycrystalline Ni-Mn-Ga is inexpensive and technologically easy accessible, but constrains from the grain boundaries inhibit the twin boundary motion, whereby a very low MFIS is observed. Here, we have shown for the first time that a polycrystalline Ni-Mn-Ga can be split into the magnetostrain-active single grains which, being specially assembled in a silicone polymer matrix, caused large and fully reversible MFIS of the resulting composite. We termed the unique reversibility of a large MFIS of the composite as the magnetic field-induced rubber-like behavior. The magnetostrain of individual particles was explored by the X-ray μCT 3D imaging. The results suggest novel solutions for development of the low cost magnetic actuators and sensors for haptic applications.

ACS Style

P. Sratong-On; V. A. Chernenko; J. Feuchtwanger; Hideki Hosoda. Magnetic field-induced rubber-like behavior in Ni-Mn-Ga particles/polymer composite. Scientific Reports 2019, 9, 3443 .

AMA Style

P. Sratong-On, V. A. Chernenko, J. Feuchtwanger, Hideki Hosoda. Magnetic field-induced rubber-like behavior in Ni-Mn-Ga particles/polymer composite. Scientific Reports. 2019; 9 (1):3443.

Chicago/Turabian Style

P. Sratong-On; V. A. Chernenko; J. Feuchtwanger; Hideki Hosoda. 2019. "Magnetic field-induced rubber-like behavior in Ni-Mn-Ga particles/polymer composite." Scientific Reports 9, no. 1: 3443.

Journal article
Published: 01 February 2019 in Energy Procedia
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Palm empty fruit bunch (EFB) has a high potential to be utilized as energy source in Indonesia. However, due to some of its properties such as low bulk density, low hydrophobicity, high moisture content, high chlorine and alkaline content, pretreatment of EFB is required before it can be utilized as fuel. This study examined the effects of hydrothermal treatment and pelleting temperature on physical characteristics of EFB pellets. EFB was hydrothermally treated using 10m3 batch type reactor and water leached using centrifugal machine. Single pellet making device was used for densification of both treated and untreated EFB. Pellets were compacted at a pressure of 60 MPa and temperature of 100, 150 and 200 °C. Pellet density, compressive strength and durability of each pellets were evaluated. Results indicated that combination of hydrothermal treatment and water leaching significantly improved pelletization performance of EFB especially when it was pelletized at 100 °C. At pelleting temperature of 100 °C, pellet durability index (PDI) and compressive strength of EFB increased from 78.1% and 2.85 MPa to 98.72% and 7.80 MPa respectively when it was hydrothermally treated. Notable increase in pellet properties of untreated EFB were also observed as pelletizing temperature increase. At pelleting temperature of 200 °C, PDI and compressive strength increased to 92.83% and 7.09 MPa respectively. However, only slight improvement in characteristics of the washed hydrochar pellets were observed as the pelletizing temperature increased.

ACS Style

Sirawasith Ruksathamcharoen; Teerapong Chuenyam; Pimpet Stratong-On; Hideki Hosoda; Tri Sesillia; Kunio Yoshikawa. Effects of hydrothermal treatment and pelletizing temperature on physical properties of empty fruit bunch pellets. Energy Procedia 2019, 158, 681 -687.

AMA Style

Sirawasith Ruksathamcharoen, Teerapong Chuenyam, Pimpet Stratong-On, Hideki Hosoda, Tri Sesillia, Kunio Yoshikawa. Effects of hydrothermal treatment and pelletizing temperature on physical properties of empty fruit bunch pellets. Energy Procedia. 2019; 158 ():681-687.

Chicago/Turabian Style

Sirawasith Ruksathamcharoen; Teerapong Chuenyam; Pimpet Stratong-On; Hideki Hosoda; Tri Sesillia; Kunio Yoshikawa. 2019. "Effects of hydrothermal treatment and pelletizing temperature on physical properties of empty fruit bunch pellets." Energy Procedia 158, no. : 681-687.

Journal article
Published: 01 December 2018 in Materials Science Forum
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The stress-induced martensitic transformation and slip deformation behavior were investigated by the compression test with anin-situobservation in a Ti-6Mo-10Al (mol %) alloy single crystal. Owing to the stress-induced martensitic transformation from the parent β phase to the α′′ martensite phase, the single crystal of α′′ martensite without internal twinnings was successfully obtained at room temperature. By further compression, the slip deformation occurred in the single crystal of α′′ martensite. The operated slip system in the α′′ martensite was analyzed by the two face trace analyses, and the slip direction was determined to be []o.

ACS Style

Ryotaro Hara; Masaki Tahara; Tomonari Inamura; Hideki Hosoda. An In Situ Observation of Slip Deformation in a Compressed Ti-Mo-Al Single Crystal. Materials Science Forum 2018, 941, 1463 -1467.

AMA Style

Ryotaro Hara, Masaki Tahara, Tomonari Inamura, Hideki Hosoda. An In Situ Observation of Slip Deformation in a Compressed Ti-Mo-Al Single Crystal. Materials Science Forum. 2018; 941 ():1463-1467.

Chicago/Turabian Style

Ryotaro Hara; Masaki Tahara; Tomonari Inamura; Hideki Hosoda. 2018. "An In Situ Observation of Slip Deformation in a Compressed Ti-Mo-Al Single Crystal." Materials Science Forum 941, no. : 1463-1467.

Journal article
Published: 10 October 2018 in Optics Express
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To date, most distributed Brillouin sensors for structural health monitoring have employed glass optical fibers as sensing fibers, but they are inherently fragile and cannot withstand strains of >3%. This means that the maximal detectable strain of glass-fiber-based Brillouin sensors was ~3%, which is far from being sufficient for monitoring the possible distortion caused by big earthquakes. To extend this strain dynamic range, polymer optical fibers (POFs) have been used as sensing fibers. As POFs can generally withstand even ~100% strain, at first, Brillouin scattering in POFs was expected to be useful in measuring such large strain. However, the maximal detectable strain using Brillouin scattering in POFs was found to be merely ~5%, because of a Brillouin-frequency-shift hopping phenomenon accompanied by a slimming effect peculiar to polymer materials. This conventional record of the strain dynamic range (5%) was still far from being sufficient. Here, we have thought of an idea that the strain dynamic range can be further extended by employing a POF with its whole length slimmed in advance and by avoiding the Brillouin-frequency-shift hopping. The experimental results reveal that, by applying 3.0% strain to a slimmed POF beforehand, we can achieve a >25% strain dynamic range, which is >5 times the conventional value and will greatly extend the application fields of fiber-optic Brillouin sensing.

ACS Style

Yosuke Mizuno; Natsuki Matsutani; Neisei Hayashi; Heeyoung Lee; Masaki Tahara; Hideki Hosoda; Kentaro Nakamura. Brillouin characterization of slimmed polymer optical fibers for strain sensing with extremely wide dynamic range. Optics Express 2018, 26, 28030 -28037.

AMA Style

Yosuke Mizuno, Natsuki Matsutani, Neisei Hayashi, Heeyoung Lee, Masaki Tahara, Hideki Hosoda, Kentaro Nakamura. Brillouin characterization of slimmed polymer optical fibers for strain sensing with extremely wide dynamic range. Optics Express. 2018; 26 (21):28030-28037.

Chicago/Turabian Style

Yosuke Mizuno; Natsuki Matsutani; Neisei Hayashi; Heeyoung Lee; Masaki Tahara; Hideki Hosoda; Kentaro Nakamura. 2018. "Brillouin characterization of slimmed polymer optical fibers for strain sensing with extremely wide dynamic range." Optics Express 26, no. 21: 28030-28037.