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Weimin Long
State Key Laboratory of Advanced Brazing Filler Metals and Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001, China

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Journal article
Published: 16 May 2021 in Crystals
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The effect of different In contents on the melting characteristics, mechanical properties, and microstructure of 12Ag–Cu–Zn–Sn filler metal was investigated in this paper, and flame brazing of 304 stainless steel and copper plates was done using the 12Ag–Cu–Zn–Sn–xIn filler metal. The results indicate that adding appropriate amount of In can evidently decrease the solidus and liquidus temperatures and improve the wettability of the low silver based filler metals. In addition, the shear strength of 304 stainless steel and copper plates joint brazed by 12Ag–Cu–Zn–Sn–1In are satisfactory due to the solution strength effect, and scanning electron microscopy examination of the braze-zone revealed that more relatively sound joints were obtained when brazing was done with 12Ag–Cu–Zn–Sn–xIn filler metal than with Indium free one; its performance is comparable to that of the joint brazed with the 20Ag–Cu–Zn–Sn filler metal, having a remarkable silver-saving effect.

ACS Style

Jie Wu; Songbai Xue; Zhen Yao; Weimin Long. Study on Microstructure and Properties of 12Ag–Cu–Zn–Sn Cadmium-Free Filler Metals with Trace In Addition. Crystals 2021, 11, 557 .

AMA Style

Jie Wu, Songbai Xue, Zhen Yao, Weimin Long. Study on Microstructure and Properties of 12Ag–Cu–Zn–Sn Cadmium-Free Filler Metals with Trace In Addition. Crystals. 2021; 11 (5):557.

Chicago/Turabian Style

Jie Wu; Songbai Xue; Zhen Yao; Weimin Long. 2021. "Study on Microstructure and Properties of 12Ag–Cu–Zn–Sn Cadmium-Free Filler Metals with Trace In Addition." Crystals 11, no. 5: 557.

Article
Published: 05 January 2021 in Journal of Materials Engineering and Performance
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Microstructure, tensile property, microhardness and fracture behavior of the hydrogenated Ti-0.3Mo-0.8Ni alloy gas tungsten arc welding (GTAW) joints were investigated. The results show that the microstructure of the hydrogenated 0.21 wt.% H weld zone were composed of alternating lamellar alpha/needle-like transformed beta and the hydride. Transformed beta was secondary decomposed into the short rod-shaped secondary alpha and lamellar residual beta. The “Pinning” effect of the hydride and more difficult dislocations cross slip directly led to the increased ultimate tensile and yield strength. Average hardness of weld zone, heat affected zone and base metal for the hydrogenated specimens were 196, 177 and 169 HV respectively. Hardness of the former was greater than that of the latter two, hydrogen-induced hardness of the welded joint was significantly increased. Fracture mode of the hydrogenated welded joints changed from the single ductile fracture to mainly brittle fracture with a few dimples fracture. Main cracks that propagated alternately to the original beta grain boundary resulted in local fracture of the microstructure, the interconnected local fractures finally led to the overall fracture of the hydrogenated welded joint.

ACS Style

Quanming Liu; Weimin Long; Li Fu; Zhaohui Zhang; Sujuan Zhong; Haiying Yang. Microstructure and Mechanical Properties of Hydrogenated Ti-0.3Mo-0.8Ni Alloy Gas Tungsten Arc Welding Joints. Journal of Materials Engineering and Performance 2021, 30, 1022 -1029.

AMA Style

Quanming Liu, Weimin Long, Li Fu, Zhaohui Zhang, Sujuan Zhong, Haiying Yang. Microstructure and Mechanical Properties of Hydrogenated Ti-0.3Mo-0.8Ni Alloy Gas Tungsten Arc Welding Joints. Journal of Materials Engineering and Performance. 2021; 30 (2):1022-1029.

Chicago/Turabian Style

Quanming Liu; Weimin Long; Li Fu; Zhaohui Zhang; Sujuan Zhong; Haiying Yang. 2021. "Microstructure and Mechanical Properties of Hydrogenated Ti-0.3Mo-0.8Ni Alloy Gas Tungsten Arc Welding Joints." Journal of Materials Engineering and Performance 30, no. 2: 1022-1029.

Journal article
Published: 15 December 2020 in Applied Sciences
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In this study, the effect of appropriate Nd addition on improving the high-temperature reliability of Sn-3.8Ag-0.7Cu (SAC387)/Cu solder joint after aging treatment was investigated. The interfacial microstructure of solder joint was refined with proper addition of Nd. This phenomenon could be explained as the adsorbing-hindering effect of surface-active Nd atoms which blocked the growth of brittle intermetallic compounds (IMCs) in the solder joint. Theoretical analysis indicated that 0.05 wt. % addition of Nd could distinctly decrease the growth constant of Cu6Sn5 IMCs and slightly decrease the growth constant of Cu3Sn IMCs respectively. The shear force of SAC387-0.05Nd/Cu solder joint was evidently improved compared with the origin solder joint. In addition, SAC387-0.05Nd/Cu solder joint maintained excellent mechanical property compared with SAC387/Cu solder joint even after 1440 h aging treatment.

ACS Style

Peng Xue; Jianzhi Tao; Peng He; Weimin Long; Sujuan Zhong. The Enhanced Mechanism of 0.05 wt. % Nd Addition on High Temperature Reliability of Sn-3.8Ag-0.7Cu/Cu Solder Joint. Applied Sciences 2020, 10, 8935 .

AMA Style

Peng Xue, Jianzhi Tao, Peng He, Weimin Long, Sujuan Zhong. The Enhanced Mechanism of 0.05 wt. % Nd Addition on High Temperature Reliability of Sn-3.8Ag-0.7Cu/Cu Solder Joint. Applied Sciences. 2020; 10 (24):8935.

Chicago/Turabian Style

Peng Xue; Jianzhi Tao; Peng He; Weimin Long; Sujuan Zhong. 2020. "The Enhanced Mechanism of 0.05 wt. % Nd Addition on High Temperature Reliability of Sn-3.8Ag-0.7Cu/Cu Solder Joint." Applied Sciences 10, no. 24: 8935.

Journal article
Published: 29 October 2020 in Metals
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In order to meet the service requirements of electronic devices working at 300 °C in the fields of energy resource prospecting and space exploration, Cr element was added to modify AuGa solder to improve its high-temperature performance. The results showed that the addition of 0.3 wt.% Cr element reduced the loss of Ga element in the smelting and casting process, and effectively improved the problem of the inhomogeneous microstructure of the solder matrix. On the basis of maintaining the good wettability of the solder, the addition of trace chromium effectively restrains the excessive flux of the solder, and the presence of chromium improves the oxidation resistance of the solder. Furthermore, Cr element optimized the interface morphology and improved the mechanical properties of the solder joint. The shear strength of the AuGa-0.3Cr/Ni joint was 87.2 MPa, which was 13.1% higher than that of the joint without Cr element. After 240 h of aging, the shear strength of the AuGa-0.3Cr joint was still the peak value at 84.1 MPa, which was 16.3% higher than that of the AuGa joint.

ACS Style

Yu Tao; Songbai Xue; Han Liu; Weimin Long; Bo Wang. Effect of Cr Addition on Microstructure and Properties of AuGa Solder. Metals 2020, 10, 1449 .

AMA Style

Yu Tao, Songbai Xue, Han Liu, Weimin Long, Bo Wang. Effect of Cr Addition on Microstructure and Properties of AuGa Solder. Metals. 2020; 10 (11):1449.

Chicago/Turabian Style

Yu Tao; Songbai Xue; Han Liu; Weimin Long; Bo Wang. 2020. "Effect of Cr Addition on Microstructure and Properties of AuGa Solder." Metals 10, no. 11: 1449.

Journal article
Published: 15 October 2020 in Metals
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Extreme temperature change has generally been the great challenge to spacecraft electronic components, particularly in long, periodic, deep-space exploration missions. Hence, researchers have paid more attention to the reliability of component packaging materials. In this study, the microstructure evolution on the interface of Cu/Ni/Au/Au-12Ge/Au/Ni/Cu joints, as well as the effects of extreme thermal shock on mechanical properties and the fracture mode in the course of extreme thermal changes between −196 and 150 °C, have been investigated. Results revealed that the interface layers comprised of two thin layers of NiGe and Ni5Ge3 compounds after Au-12Ge solder alloy was soldered on the Au/Ni/Cu substrate. After extreme thermal shock tests, the microstructure morphology converted from scallop type to planar one due to the translation from NiGe to Ni5Ge3. Meanwhile, the thickness of interface layer hardly changed. The shear strength of the joints after 300 cycles of extreme thermal shock was 35.1 MPa, which decreased by 19.61%. The fracture location changed from the solder to solder/NiGe interface, and then to the interface of NiGe/Ni5Ge3 IMC layer. Moreover, the fracture type of the joints gradually transformed from ductile fracture mode to brittle mode during thermal shock test. Simultaneously, the formation and extension of defects, such as micro-voids and micro-cracks, were found during the process of thermal shock due to the different thermal expansion coefficient among the solder, interface layer and substrate.

ACS Style

Ziyi Wang; Songbai Xue; Weimin Long; Bo Wang; Jianhao Wang; Peng Zhang. Effects of Extreme Thermal Shock on Microstructure and Mechanical Properties of Au-12Ge/Au/Ni/Cu Solder Joint. Metals 2020, 10, 1373 .

AMA Style

Ziyi Wang, Songbai Xue, Weimin Long, Bo Wang, Jianhao Wang, Peng Zhang. Effects of Extreme Thermal Shock on Microstructure and Mechanical Properties of Au-12Ge/Au/Ni/Cu Solder Joint. Metals. 2020; 10 (10):1373.

Chicago/Turabian Style

Ziyi Wang; Songbai Xue; Weimin Long; Bo Wang; Jianhao Wang; Peng Zhang. 2020. "Effects of Extreme Thermal Shock on Microstructure and Mechanical Properties of Au-12Ge/Au/Ni/Cu Solder Joint." Metals 10, no. 10: 1373.

Article
Published: 21 July 2020 in Journal of Materials Engineering and Performance
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The effects of height reductions and microstructure inhomogeneity on hot deformation behavior of the hydrogenated 0.21 wt.%H Ti-0.3Mo-0.8Ni alloy welded joints were investigated. The hydrogen-induced evolution mechanisms of flow stress were discussed. The results show that fully lamellar microstructures were stretched or bent with increasing height reductions, the inhomogeneity had no significant effect on microstructure evolution at a small height reduction. The hydrides had occurred local fracture and a large angle bending at height reduction of 60%. The morphology of DRX grains tended to change from approximate equiaxed to large lamellar with increasing hydrogen content to the 0.21 wt.%H. Flow stress decreased significantly with increasing hydrogen content, but height reduction had a limited effect on flow stress evolution. Flow stress of the hydrogenated 0.21 wt.%H weld zone was larger than that of base metal at height reduction of 60%, the 0.21 wt.%H could not significantly improve hot working performance of the weld zone. The hydrogen-induced dynamic recrystallization of alpha lamellas and improved dislocation movement resulted in the rapid reduction of flow stress with the 0.21 wt.%H. The limited increase of beta phase and local stress concentration also finitely led to a slight decrease of flow stress.

ACS Style

Quanming Liu; Weimin Long; Li Fu; Sujuan Zhong; Luyi Wang. Hot Deformation Behavior of Hydrogenated 0.21 wt.%H Ti-0.3Mo-0.8Ni Alloy Welded Joints. Journal of Materials Engineering and Performance 2020, 29, 4814 -4821.

AMA Style

Quanming Liu, Weimin Long, Li Fu, Sujuan Zhong, Luyi Wang. Hot Deformation Behavior of Hydrogenated 0.21 wt.%H Ti-0.3Mo-0.8Ni Alloy Welded Joints. Journal of Materials Engineering and Performance. 2020; 29 (7):4814-4821.

Chicago/Turabian Style

Quanming Liu; Weimin Long; Li Fu; Sujuan Zhong; Luyi Wang. 2020. "Hot Deformation Behavior of Hydrogenated 0.21 wt.%H Ti-0.3Mo-0.8Ni Alloy Welded Joints." Journal of Materials Engineering and Performance 29, no. 7: 4814-4821.

Journal article
Published: 05 June 2020 in Metals
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The influence of heat and droplet transfer into weld pool dynamic behavior and weld metal microstructure in double-pulsed gas metal arc welding (DP-GMAW) was investigated by the self-designed high-speed welding photography system. The heat input, the arc pressure, the droplet momentum and impingement pressure were measured and calculated. It was found that the arc pressure is far less than the droplet impingement pressure. The heat input and droplet impingement pressure per unit time acting on weld pool were proportional to the current pulse frequency, which fluctuated with thermal pulse. The size and oscillation amplitude of the weld pool had noticeable periodic changes synchronized with the process of heat input and droplet impingement. Compared to the microstructure of pulsed gas metal arc welding (P-GMAW) weld metal, that of DP-GMAW weld metal was significantly refined. High oscillation amplitude assisted the enhancement of weld pool convection, which leads to more constitutional supercooling. The heat input and shear force during the peak of thermal pulse causing dendrite fragmentation which provided sufficient crystal nucleus for the growth of equiaxed grains and the possibility of grain refinement. The effects of current parameters on welding behavior and weld metal grain size are investigated for further understanding of DP-GMAW.

ACS Style

Tao Chen; Songbai Xue; Peng Zhang; Bo Wang; Peizhuo Zhai; Weimin Long. Investigation on the Dynamic Behavior of Weld Pool and Weld Microstructure during DP-GMAW for Austenitic Stainless Steel. Metals 2020, 10, 754 .

AMA Style

Tao Chen, Songbai Xue, Peng Zhang, Bo Wang, Peizhuo Zhai, Weimin Long. Investigation on the Dynamic Behavior of Weld Pool and Weld Microstructure during DP-GMAW for Austenitic Stainless Steel. Metals. 2020; 10 (6):754.

Chicago/Turabian Style

Tao Chen; Songbai Xue; Peng Zhang; Bo Wang; Peizhuo Zhai; Weimin Long. 2020. "Investigation on the Dynamic Behavior of Weld Pool and Weld Microstructure during DP-GMAW for Austenitic Stainless Steel." Metals 10, no. 6: 754.

Journal article
Published: 18 April 2020 in Metals
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Titanium and zirconia (ZrO2) ceramics are widely used in biomedical fields. This study aims to achieve reliable brazed joints of titanium/ZrO2 using biocompatible Au filler for implantable medical products. The effects of brazing temperature and holding time on the interfacial microstructures and mechanical properties of titanium/Au/ZrO2 joints were fully investigated by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS) and X-ray diffraction (XRD). The results indicated that the typical interfacial microstructure of the titanium/Au/ZrO2 joint was titanium/Ti3Au layer/TiAu layer/TiAu2 layer/TiAu4 layer/TiO layer/ZrO2 ceramic. With an increasing brazing temperature or holding time, the thickness of the Ti3Au + TiAu + TiAu2 layer increased gradually. The growth of the TiO layer was observed, which promoted metallurgical bonding between the filler metal and ZrO2 ceramic. The optimal shear strength of ~35.0 MPa was obtained at 1150 °C for 10 min. SEM characterization revealed that cracks initiated and propagated along the interface of TiAu2 and TiAu4 reaction layers.

ACS Style

Yuzhen Lei; Hong Bian; Wei Fu; Xiaoguo Song; Jicai Feng; Weimin Long; Hongwei Niu. Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties. Metals 2020, 10, 526 .

AMA Style

Yuzhen Lei, Hong Bian, Wei Fu, Xiaoguo Song, Jicai Feng, Weimin Long, Hongwei Niu. Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties. Metals. 2020; 10 (4):526.

Chicago/Turabian Style

Yuzhen Lei; Hong Bian; Wei Fu; Xiaoguo Song; Jicai Feng; Weimin Long; Hongwei Niu. 2020. "Evaluation of Biomedical Ti/ZrO2 Joint Brazed with Pure Au Filler: Microstructure and Mechanical Properties." Metals 10, no. 4: 526.

Journal article
Published: 15 April 2020 in Applied Sciences
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The internal relations among the oscillation characteristics of the weld pool, the voltage signal curve and the penetration status of the weld joint in pulsed gas metal arc welding were investigated by using high-speed camera and image analysis system to extract characteristics of weld pool oscillation. The results show that the amplitude of weld pool oscillation decreased with decreasing weld penetration. An abrupt change occurred in the frequency components and amplitude of weld pool oscillation, accompanying the transition from partial to full penetration. The voltage signal curve lost the oscillation frequency characteristic of the pool, due to the curvature of the weld pool surface. While similar to the oscillation amplitude, the fluctuation of the voltage signal caused by the weld pool oscillation reflected the penetration of the weld pool. The abrupt transition in the fluctuation amplitude of the voltage signal in the base duration from partial penetration to full penetration may be used to sense the penetration of the weld pool in real time.

ACS Style

Tao Chen; Songbai Xue; Peizhuo Zhai; Bo Wang; Weimin Long. Study on Penetration Sensing Method Based on Pool Oscillation and Arc Voltage during Pulsed GMAW. Applied Sciences 2020, 10, 2735 .

AMA Style

Tao Chen, Songbai Xue, Peizhuo Zhai, Bo Wang, Weimin Long. Study on Penetration Sensing Method Based on Pool Oscillation and Arc Voltage during Pulsed GMAW. Applied Sciences. 2020; 10 (8):2735.

Chicago/Turabian Style

Tao Chen; Songbai Xue; Peizhuo Zhai; Bo Wang; Weimin Long. 2020. "Study on Penetration Sensing Method Based on Pool Oscillation and Arc Voltage during Pulsed GMAW." Applied Sciences 10, no. 8: 2735.

Journal article
Published: 11 December 2019 in Metals
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The synergistic effects of Nd and Ga on the microstructure and mechanical properties of ER4047 alloy wires and the resulting MIG(Melt inert-gas welding) joints were investigated. Experimental results show that the hydrogen content in the liquid and solid alloy decreases rapidly and then increases slowly with the addition of Nd in the range of 0–0.8 wt.%. Under the same conditions, the hydrogen content ratio in the solid and liquid is between 1.9 and 2.1. After adding 0.08–0.2 wt.% Nd, the α-Al dendrites and eutectic Si phases in the ER4047 alloys are refined and modified, respectively; the quality index of the cast rod increases and the weld percent porosity of the MIG joint significantly decreases. However, when 0.8 wt.% Nd is added, although the size of the eutectic Si phase reaches a minimum value, a large number of coarse needle-like Nd-rich phases precipitate in the structure. Moreover, Ga inhibits the precipitation of the Nd-rich phases, thus improving the mechanical properties, especially the elongation of the cast rod. When 0.2 wt.% Nd and 0.05 wt.% Ga are added into the alloy wire, the porosity of the MIG joint reaches the lowest value herein, and the tensile strength and face/back bending angles reach their maximum values.

ACS Style

Peng Xue; Jianzhi Tao; Peng He; Bo Wang; Weimin Long; Sujuan Zhong; Jingyi Luo. Synergistic Effect of Nd and Ga on the Microstructure and Mechanical Properties of ER4047 Alloy Wires. Metals 2019, 9, 1336 .

AMA Style

Peng Xue, Jianzhi Tao, Peng He, Bo Wang, Weimin Long, Sujuan Zhong, Jingyi Luo. Synergistic Effect of Nd and Ga on the Microstructure and Mechanical Properties of ER4047 Alloy Wires. Metals. 2019; 9 (12):1336.

Chicago/Turabian Style

Peng Xue; Jianzhi Tao; Peng He; Bo Wang; Weimin Long; Sujuan Zhong; Jingyi Luo. 2019. "Synergistic Effect of Nd and Ga on the Microstructure and Mechanical Properties of ER4047 Alloy Wires." Metals 9, no. 12: 1336.

Journal article
Published: 07 December 2019 in Metals
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In order to study internal relation among the behavior of the weld pool, the microstructure of weld bead and the waveform of short-circuiting gas metal arc welding (S-GMAW), a high speed photograph-images analysis system was formed to extract characteristics of weld pool behavior. Three representative waveform control methods were used to provide partly and fully penetrated weld pools and beads. It was found that the behavior of the weld pool was related to the instantaneous power density of the liquid bridge at the break-up time. Weld pool oscillation was triggered by the explosion of the liquid bridge, the natural oscillation frequencies were derived by the continuous wavelet transform. The change of weld pool state caused the transition of oscillation mode, and it led to different nature oscillation frequencies between partial and full penetration. Slags flow pattern could be an indication of the weld pool flow. Compared with the scattered slags on fully penetrated weld pool, slag particles accumulated on partially penetrated weld pools. The oscillating promoted the convection of the welding pool and resulted in larger melting width and depth, the grain size, and the content of pro-eutectoid ferrite in the weld microstructure of S235JR increased, the content of acicular ferrite decreased.

ACS Style

Tao Chen; Songbai Xue; Bo Wang; Peizhuo Zhai; Weimin Long. Study on Short-Circuiting GMAW Pool Behavior and Microstructure of the Weld with Different Waveform Control Methods. Metals 2019, 9, 1326 .

AMA Style

Tao Chen, Songbai Xue, Bo Wang, Peizhuo Zhai, Weimin Long. Study on Short-Circuiting GMAW Pool Behavior and Microstructure of the Weld with Different Waveform Control Methods. Metals. 2019; 9 (12):1326.

Chicago/Turabian Style

Tao Chen; Songbai Xue; Bo Wang; Peizhuo Zhai; Weimin Long. 2019. "Study on Short-Circuiting GMAW Pool Behavior and Microstructure of the Weld with Different Waveform Control Methods." Metals 9, no. 12: 1326.

Journal article
Published: 04 June 2019 in Coatings
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The effect of Sn content added in pre-alloy powder on the microstructure, porosity, hardness and bending strength of hot pressing sintering of a diamond matrix was investigated. The results show that with the increase of Sn content in the pre-alloy powder, a reduction in grain size and porosity as well as an increase in hardness is observed. As a result of the reduction in porosity, the flexural strength increases with the increase in the Sn content in the pre-alloy powder. However, with the increase of Sn content, the bending strength decreases owing to the formation of Cu5.6Sn in the matrix. The properties of the diamond matrix are improved, and the lifetime of the diamond matrix is prolonged when the Sn content is 4 wt.%.

ACS Style

Dashuang Liu; Weimin Long; Mingfang Wu; Kai Qi; Juan Pu. Microstructure Evolution and Lifetime Extension Mechanism of Sn-Added Fe-Based Pre-Alloy Brazing Coating in Diamond Tools. Coatings 2019, 9, 364 .

AMA Style

Dashuang Liu, Weimin Long, Mingfang Wu, Kai Qi, Juan Pu. Microstructure Evolution and Lifetime Extension Mechanism of Sn-Added Fe-Based Pre-Alloy Brazing Coating in Diamond Tools. Coatings. 2019; 9 (6):364.

Chicago/Turabian Style

Dashuang Liu; Weimin Long; Mingfang Wu; Kai Qi; Juan Pu. 2019. "Microstructure Evolution and Lifetime Extension Mechanism of Sn-Added Fe-Based Pre-Alloy Brazing Coating in Diamond Tools." Coatings 9, no. 6: 364.

Journal article
Published: 03 June 2019 in Metals
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Medical titanium and alumina (Al2O3) bioceramic are widely utilized as biomaterials. A reliable brazed joint of titanium and alumina was successfully obtained using biocompatible Au foil for implantable devices in the present study. The interfacial microstructure and reaction products of titanium/Au/Al2O3 joints brazed under different conditions were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). In this study, the typical interfacial microstructure of the titanium/Au/Al2O3 joint was titanium/Ti3Au layer/TiAu layer/TiAu2 layer/TiAu4 layer/Au + granular TiAu4 layer/TiOx phase/Al2O3 ceramic. With increasing brazing temperature or holding time, the thicknesses of Ti3Au + TiAu + TiAu2 layers adjacent to the titanium substrate increased gradually. Shear tests indicated that the joint brazed at 1115 °C for 3 min exhibited the highest shear strength of 39.2 MPa. Typical fracture analysis displayed that the crack started at the Al2O3 ceramic and propagated along the interface of TiAu2 and TiAu4 reaction layers.

ACS Style

Hong Bian; Xiaoguo Song; Shengpeng Hu; Yuzhen Lei; Yide Jiao; Shutong Duan; Jicai Feng; Weimin Long. Microstructure Evolution and Mechanical Properties of Titanium/Alumina Brazed Joints for Medical Implants. Metals 2019, 9, 644 .

AMA Style

Hong Bian, Xiaoguo Song, Shengpeng Hu, Yuzhen Lei, Yide Jiao, Shutong Duan, Jicai Feng, Weimin Long. Microstructure Evolution and Mechanical Properties of Titanium/Alumina Brazed Joints for Medical Implants. Metals. 2019; 9 (6):644.

Chicago/Turabian Style

Hong Bian; Xiaoguo Song; Shengpeng Hu; Yuzhen Lei; Yide Jiao; Shutong Duan; Jicai Feng; Weimin Long. 2019. "Microstructure Evolution and Mechanical Properties of Titanium/Alumina Brazed Joints for Medical Implants." Metals 9, no. 6: 644.

Review
Published: 17 May 2019 in Applied Sciences
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With the development of microelectronic packaging and increasingly specific service environment of solder joints, much stricter requirements have been placed on the properties of lead-free solders. On account of small size effect and high surface energy, nanoparticles have been widely used to improve the microstructure and properties of lead-free solders. Therefore, the composite solders bearing nanoparticles have recently attracted wide attention. This article reviewed the recent research on SnAgCu, SnBi, and SnZn composite solder alloys and introduced the effect of nanoparticles on their microstructure, mechanical properties, wettability, and reliability. The mechanism of nanoparticles strengthening was analyzed and summarized. In addition, the shortcomings and future development trends of nanoparticle-reinforced lead-free solders were discussed, which is expected to provide some theoretical reference for the application of these composite solder in 3D IC package.

ACS Style

Peng Zhang; Songbai Xue; Jianhao Wang; Peng Xue; Sujuan Zhong; Weimin Long. Effect of Nanoparticles Addition on the Microstructure and Properties of Lead-Free Solders: A Review. Applied Sciences 2019, 9, 2044 .

AMA Style

Peng Zhang, Songbai Xue, Jianhao Wang, Peng Xue, Sujuan Zhong, Weimin Long. Effect of Nanoparticles Addition on the Microstructure and Properties of Lead-Free Solders: A Review. Applied Sciences. 2019; 9 (10):2044.

Chicago/Turabian Style

Peng Zhang; Songbai Xue; Jianhao Wang; Peng Xue; Sujuan Zhong; Weimin Long. 2019. "Effect of Nanoparticles Addition on the Microstructure and Properties of Lead-Free Solders: A Review." Applied Sciences 9, no. 10: 2044.

Journal article
Published: 01 June 2018 in Rare Metal Materials and Engineering
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Effects of Ca impurity on microstructures and mechanical properties of Al-5Mg filler alloys were investigated with SEM, EDS, XRD, tensile test and impact test. The results indicate that the phase composition of Al-5Mg alloy is affected by the Ca impurity. It is observed that block-like (Ti,Cr)2Ca(Al,Mg)20 phase is distributed discontinuously along the grain boundaries when the content of Ca is less than 0.28 wt%. When the content of Ca is over 0.28 wt%, bar-like Al2Ca and block-like (Ti,Cr)2Ca(Al,Mg)20 combine together and are distributed along the grain boundaries, and the amount and size of Ca-rich phase (both the bar-like and block-like) increase with the increasing of Ca content. Tensile strength of the Al-5Mg alloys increases firstly and then decreases with the increasing Ca content, and the tensile strength gets to a maximum value when the content of Ca is 0.28 wt%. The plasticity and fracture toughness decrease slowly (Ca content 0 wt%~0.28 wt%) but then significantly decrease (Ca content>0.28 wt%), and the tensile or impact fracture mode transform from the transgranular ductile fracture to brittle cleavage fracture.

ACS Style

Lu Quanbin; Shen Yuanxun; Zhong Sujuan; Zhao Chenfeng; Long Weimin. Effect of Ca Impurity on Microstructures and Mechanical Properties of As-Cast Al-5Mg Filler Alloy. Rare Metal Materials and Engineering 2018, 47, 1739 -1743.

AMA Style

Lu Quanbin, Shen Yuanxun, Zhong Sujuan, Zhao Chenfeng, Long Weimin. Effect of Ca Impurity on Microstructures and Mechanical Properties of As-Cast Al-5Mg Filler Alloy. Rare Metal Materials and Engineering. 2018; 47 (6):1739-1743.

Chicago/Turabian Style

Lu Quanbin; Shen Yuanxun; Zhong Sujuan; Zhao Chenfeng; Long Weimin. 2018. "Effect of Ca Impurity on Microstructures and Mechanical Properties of As-Cast Al-5Mg Filler Alloy." Rare Metal Materials and Engineering 47, no. 6: 1739-1743.