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AA6082 extruded bars were annealed and then hot-deformed at 693 K, cold-deformed at room temperature (RF), or treated at sub-zero temperatures (CF). After the solution and the aging treatment, the mechanical properties of the samples were tested. The experimental results demonstrate that the hot-deformed samples were stronger but less elongated than the RF and CF samples. All hot-deformed (HF), RF, and CF samples had mechanical properties that exceeded UTS > 310, YS > 260 MPa and an elongation > 10%. The RF and CF samples greatly enhance elongation (up to 16%) and toughness in addition to moderate strength (UTS ≥ 320 and YS ≥ 295 MPa). Affected by having high fractions of high misorientation angle grain boundaries (MAGBs) per unit area in the matrix, the RF and CF samples deteriorated their corrosion resistance by degrading Ecorr values. The surface of corroded HF50 was recorded to confirm that the particles were attacked by chloride and oxidized. Increasing the total lengths of high-MAGBs and particle counts per unit area accelerated corrosion to lift up Icorr values.
Teng-Shih Shih; Sung-Ta Lin; Lih-Ren Hwang. Factors Affecting Toughness and Corrosion Resistance of AA6082 Forgings. Journal of Materials Engineering and Performance 2021, 30, 367 -378.
AMA StyleTeng-Shih Shih, Sung-Ta Lin, Lih-Ren Hwang. Factors Affecting Toughness and Corrosion Resistance of AA6082 Forgings. Journal of Materials Engineering and Performance. 2021; 30 (1):367-378.
Chicago/Turabian StyleTeng-Shih Shih; Sung-Ta Lin; Lih-Ren Hwang. 2021. "Factors Affecting Toughness and Corrosion Resistance of AA6082 Forgings." Journal of Materials Engineering and Performance 30, no. 1: 367-378.
Al–8Zn–2.5Mg–1Cu alloy casting blocks were subjected to homogenization and annealing. The treated blocks were then held at different temperatures and forged in different dies to obtain 20 mm-thick plates. After T73 heat treatment, the plates were cut and machined to obtain tensile bar samples that were further subjected to tensile and potentiodynamic polarization tests. Upon analyzing the experimental results, the subzero-treated and forged samples (SO) developed fine grains in their matrix and displayed yield stress (YS) about 400 MPa and an elongation of 11%. The hot-forged samples (HC) displayed a relatively higher YS slightly >440 MPa and a lower elongation of 4%. The intermetallic compound particles confined to the HC decreased its corrosion resistance to be worse than that of the SO. All anodized and sealed samples effectively improved their corrosion resistance. Due to its fine grains, the anodized SO sample produced a higher Icorr than the anodized HC sample.
Teng-Shih Shih; Ei-Ting Kwang; Yung-Sen Huang. The Optimum Process to Produce High-Strength Cast/Forged Al–8%Zn–2.5%Mg–1%Cu Alloy. Metals 2019, 9, 970 .
AMA StyleTeng-Shih Shih, Ei-Ting Kwang, Yung-Sen Huang. The Optimum Process to Produce High-Strength Cast/Forged Al–8%Zn–2.5%Mg–1%Cu Alloy. Metals. 2019; 9 (9):970.
Chicago/Turabian StyleTeng-Shih Shih; Ei-Ting Kwang; Yung-Sen Huang. 2019. "The Optimum Process to Produce High-Strength Cast/Forged Al–8%Zn–2.5%Mg–1%Cu Alloy." Metals 9, no. 9: 970.
In this study, AA6066 alloy samples were cryogenically forged after annealing and then subjected to solution and aging treatments. Compared with conventional 6066-T6 alloy samples, the cryoforged samples exhibited a 34% increase in elongation but sacrificed about 8%–12% in ultimate tensile strength (UTS) and yield stress (YS). Such difference was affected by the constituent phases that changed in the samples’ matrix. Anodization and sealing did minor effect on tensile strength of the 6066-T6 samples with/without cryoforging but it decreased samples’ elongation about 8%–10%. The anodized/sealed anodic aluminum oxide (AAO) film enhanced the corrosion resistance of the cryoforged samples.
Teng-Shih Shih; Hwa-Sheng Yong; Wen-Nong Hsu. Effects of Cryogenic Forging and Anodization on the Mechanical Properties and Corrosion Resistance of AA6066–T6 Aluminum Alloys. Metals 2016, 6, 51 .
AMA StyleTeng-Shih Shih, Hwa-Sheng Yong, Wen-Nong Hsu. Effects of Cryogenic Forging and Anodization on the Mechanical Properties and Corrosion Resistance of AA6066–T6 Aluminum Alloys. Metals. 2016; 6 (3):51.
Chicago/Turabian StyleTeng-Shih Shih; Hwa-Sheng Yong; Wen-Nong Hsu. 2016. "Effects of Cryogenic Forging and Anodization on the Mechanical Properties and Corrosion Resistance of AA6066–T6 Aluminum Alloys." Metals 6, no. 3: 51.
In this study, high-strength AA7075 alloy samples were cryogenically forged after annealing and then subjected to solution and aging treatments. The cryogenically forged 7075-T73 alloy samples displayed equiaxed fine grains associated with abundant fine precipitates in their matrix. Compared with conventional 7075-T73 alloy samples, the cryogenically forged samples exhibited an 8-12% reduction in tensile strength and an increased fatigue strength and higher corrosion resistance. The fatigue strength measured at 107 cycles was 225 MPa in the bare samples; the strength was increased to 250 MPa in the cryogenically forged samples. The effect of anodization on the corrosion resistance of the bare samples was improved from (E corr) −0.80 to −0.61 V.
Teng-Shih Shih; Tien-Wei Liao; Wen-Nong Hsu. Effects of Cryogenic Forging and Anodization on the Mechanical Properties of AA 7075-T73 Aluminum Alloys. Journal of Materials Engineering and Performance 2016, 25, 1211 -1218.
AMA StyleTeng-Shih Shih, Tien-Wei Liao, Wen-Nong Hsu. Effects of Cryogenic Forging and Anodization on the Mechanical Properties of AA 7075-T73 Aluminum Alloys. Journal of Materials Engineering and Performance. 2016; 25 (3):1211-1218.
Chicago/Turabian StyleTeng-Shih Shih; Tien-Wei Liao; Wen-Nong Hsu. 2016. "Effects of Cryogenic Forging and Anodization on the Mechanical Properties of AA 7075-T73 Aluminum Alloys." Journal of Materials Engineering and Performance 25, no. 3: 1211-1218.
The choice of an electrode is the most critical parameter for water electrolysis. In this study, powder metallurgy is used to prepare aluminum-magnesium (Al-Mg) alloy electrodes. In addition to pure Mg and Al electrodes, five Al-Mg alloy electrodes composed of Al-Mg (10 wt%), Al-Mg (25 wt%), Al-Mg (50 wt%), and Al-Mg (75 wt%) were prepared. In water electrolysis experiments, the pure Al electrode exhibited optimal electrolytic efficiency. However, the Al-Mg (25 wt%) alloy was the most efficient when the anticorrosion effect and materials costs were considered. In this study, an ultrasonic field was applied to the electrolysis cell to improve its efficiency. The results revealed that the current increased by approximately 23.1% when placed in a 30 wt% KOH solution under the ultrasonic field. Electrochemical polarization impedance spectroscopy (EIS) was employed to evaluate the effect of the ultrasonic field on the reduction of polarization resistance. The results showed that the concentration impedance in the 30 wt% KOH electrolyte decreased markedly by 44%–51% Ω.
Wen-Nong Hsu; Teng-Shih Shih; Ming-Yuan Lin. Preparation of Al-Mg Alloy Electrodes by Using Powder Metallurgy and Their Application for Hydrogen Production. Advances in Materials Science and Engineering 2014, 2014, 1 -7.
AMA StyleWen-Nong Hsu, Teng-Shih Shih, Ming-Yuan Lin. Preparation of Al-Mg Alloy Electrodes by Using Powder Metallurgy and Their Application for Hydrogen Production. Advances in Materials Science and Engineering. 2014; 2014 ():1-7.
Chicago/Turabian StyleWen-Nong Hsu; Teng-Shih Shih; Ming-Yuan Lin. 2014. "Preparation of Al-Mg Alloy Electrodes by Using Powder Metallurgy and Their Application for Hydrogen Production." Advances in Materials Science and Engineering 2014, no. : 1-7.
Yung-Sen Huang; Teng-Shih Shih; Jun-Hung Chou. Electrochemical behavior of anodized AA7075-T73 alloys as affected by the matrix structure. Applied Surface Science 2013, 283, 249 -257.
AMA StyleYung-Sen Huang, Teng-Shih Shih, Jun-Hung Chou. Electrochemical behavior of anodized AA7075-T73 alloys as affected by the matrix structure. Applied Surface Science. 2013; 283 ():249-257.
Chicago/Turabian StyleYung-Sen Huang; Teng-Shih Shih; Jun-Hung Chou. 2013. "Electrochemical behavior of anodized AA7075-T73 alloys as affected by the matrix structure." Applied Surface Science 283, no. : 249-257.
AA 6063 alloys were cold-rolled (CR) either before or after solution treatment (S) and then different samples were artificially aged (T6) to obtain different samples (CRST6 and SCRT6). The highest dislocation density was observed in the SCRT6 sample which also showed the lowest particle count among the three samples; ST6, CRST6 and SCRT6. Subsequently, all samples were anodized in a 15 wt% sulfuric acid solution for different time spans to obtain anodic aluminum oxide (AAO) films. The anodized samples were further analyzed with X-ray Photoelectron Spectroscopy (XPS) analysis. We determined that the constituent phases in the AAO film were composed of hydrated amorphous alumina, hydrated oxide (Al(OH)3) and oxyhydroxide (AlOOH) phases together with some silicon-containing particles trapped in the films on all samples. In the electrochemical test, the silicon-containing particles and hydrated Al(OH)3 oxide that existed at the electrolyte/film (e/f) interface were found to inversely influence the corrosion resistance of the anodized samples.
Yung-Sen Huang; Teng-Shih Shih; Chen-En Wu. Electrochemical behavior of anodized AA6063-T6 alloys affected by matrix structures. Applied Surface Science 2013, 264, 410 -418.
AMA StyleYung-Sen Huang, Teng-Shih Shih, Chen-En Wu. Electrochemical behavior of anodized AA6063-T6 alloys affected by matrix structures. Applied Surface Science. 2013; 264 ():410-418.
Chicago/Turabian StyleYung-Sen Huang; Teng-Shih Shih; Chen-En Wu. 2013. "Electrochemical behavior of anodized AA6063-T6 alloys affected by matrix structures." Applied Surface Science 264, no. : 410-418.
Wen-Nong Hsu; Teng-Shih Shih. Effect of the nanoscratch resistance of indium nitride thin films in the etching duration. Applied Surface Science 2012, 261, 610 -615.
AMA StyleWen-Nong Hsu, Teng-Shih Shih. Effect of the nanoscratch resistance of indium nitride thin films in the etching duration. Applied Surface Science. 2012; 261 ():610-615.
Chicago/Turabian StyleWen-Nong Hsu; Teng-Shih Shih. 2012. "Effect of the nanoscratch resistance of indium nitride thin films in the etching duration." Applied Surface Science 261, no. : 610-615.
Teng-Shih Shih; Yung-Sen Huang; Chi-Fan Chen. Constituted oxides/nitrides on nitriding 304, 430 and 17-4 PH stainless steel in salt baths over the temperature range 723 to 923K. Applied Surface Science 2011, 258, 81 -88.
AMA StyleTeng-Shih Shih, Yung-Sen Huang, Chi-Fan Chen. Constituted oxides/nitrides on nitriding 304, 430 and 17-4 PH stainless steel in salt baths over the temperature range 723 to 923K. Applied Surface Science. 2011; 258 (1):81-88.
Chicago/Turabian StyleTeng-Shih Shih; Yung-Sen Huang; Chi-Fan Chen. 2011. "Constituted oxides/nitrides on nitriding 304, 430 and 17-4 PH stainless steel in salt baths over the temperature range 723 to 923K." Applied Surface Science 258, no. 1: 81-88.
In this study, high purity aluminum (Al) samples containing different levels of hydrogen were used as a base metal for anodization. To ensure constant current densities during the experiments, the voltage–time (V–t) curves were recorded. The differential ΔV/Δt curves were plotted and the energy consumed during different steps of anodization was calculated. Experimental observations show that differences in the hydrogen content affected the amount of energy consumed. The process was divided into three steps. When the voltage response at the end of step 2 exceeded 25 V, the energy consumed in steps 2 + 3 reached or exceeded 7.4 J/cm2, and the pore channels branched or merged, creating a spike in the ΔV/Δt curves in step 3. A combination of the effects of the high voltage response at the end of step 2 and the high hydrogen content in the Al samples led to the formation of an anodic aluminum oxide (AAO) film in the sulfuric acid solution, which produced crystallized boehmite. This study proposes a unique tool for understanding certain special anodic behaviors of pure Al, wherein the branching or merging of pore channels and the partial crystallization of the AAO film can be ascertained by looking at the irregularities in the ΔV/Δt curves obtained in step 3.
Teng Shih Shih; Po-Chen Chen; Yung-Sen Huang. Effects of the hydrogen content on the development of anodic aluminum oxide film on pure aluminum. Thin Solid Films 2011, 519, 7817 -7825.
AMA StyleTeng Shih Shih, Po-Chen Chen, Yung-Sen Huang. Effects of the hydrogen content on the development of anodic aluminum oxide film on pure aluminum. Thin Solid Films. 2011; 519 (22):7817-7825.
Chicago/Turabian StyleTeng Shih Shih; Po-Chen Chen; Yung-Sen Huang. 2011. "Effects of the hydrogen content on the development of anodic aluminum oxide film on pure aluminum." Thin Solid Films 519, no. 22: 7817-7825.
Teng Shih Shih; Y-J Jhou; J-W Wang; L-R Hwang. Anodisation of friction stir welds in AA 5052-O alloy. Science and Technology of Welding and Joining 2011, 16, 385 -391.
AMA StyleTeng Shih Shih, Y-J Jhou, J-W Wang, L-R Hwang. Anodisation of friction stir welds in AA 5052-O alloy. Science and Technology of Welding and Joining. 2011; 16 (5):385-391.
Chicago/Turabian StyleTeng Shih Shih; Y-J Jhou; J-W Wang; L-R Hwang. 2011. "Anodisation of friction stir welds in AA 5052-O alloy." Science and Technology of Welding and Joining 16, no. 5: 385-391.
Teng-Shih Shih; Jyun-Bo Liu; Pai-Sheng Wei. Thermally-Formed Oxide on Magnesium and Magnesium Alloys. Magnesium Alloys - Corrosion and Surface Treatments 2011, 1 .
AMA StyleTeng-Shih Shih, Jyun-Bo Liu, Pai-Sheng Wei. Thermally-Formed Oxide on Magnesium and Magnesium Alloys. Magnesium Alloys - Corrosion and Surface Treatments. 2011; ():1.
Chicago/Turabian StyleTeng-Shih Shih; Jyun-Bo Liu; Pai-Sheng Wei. 2011. "Thermally-Formed Oxide on Magnesium and Magnesium Alloys." Magnesium Alloys - Corrosion and Surface Treatments , no. : 1.
In this study, thermogravimetric analysis (TG) testing is used to measure the mass loss of polished Al–6Zn–XMg (X = 0 and 2 mass%) alloy samples heated at 773 K for 6 h in dry air or nitrogen gas. The progressive development of thermally formed oxides on an Al–6Zn–XMg (X = 0 and 2 mass%) alloy as shown by X-ray diffractometer analyses is discussed. Zn-spinel and Mg-spinel are detected on the Al–6Zn and Al–6Zn–2Mg alloy samples, respectively, and then heated in the dry air atmosphere; AlN and Mg3N2 are detected in alloy samples heated in nitrogen gas. The chain reactions that cause the serrated change in the mass loss curve are proposed and discussed.
Po-Chen Chen; Teng Shih Shih; Juen-Shiou Chen. Thermally formed oxide films on Al–6Zn–XMg (X = 0 and 2 mass%) alloys heated in different gases. Journal of Thermal Analysis and Calorimetry 2009, 99, 229 -235.
AMA StylePo-Chen Chen, Teng Shih Shih, Juen-Shiou Chen. Thermally formed oxide films on Al–6Zn–XMg (X = 0 and 2 mass%) alloys heated in different gases. Journal of Thermal Analysis and Calorimetry. 2009; 99 (1):229-235.
Chicago/Turabian StylePo-Chen Chen; Teng Shih Shih; Juen-Shiou Chen. 2009. "Thermally formed oxide films on Al–6Zn–XMg (X = 0 and 2 mass%) alloys heated in different gases." Journal of Thermal Analysis and Calorimetry 99, no. 1: 229-235.
Po-Chen Chen; Teng-Shih Shih; Chin-Yie Wu. Thermally Formed Oxides on Al-2 and 3.5 mass% Mg Alloys Heated and Held in Different Gases. MATERIALS TRANSACTIONS 2009, 50, 2366 -2372.
AMA StylePo-Chen Chen, Teng-Shih Shih, Chin-Yie Wu. Thermally Formed Oxides on Al-2 and 3.5 mass% Mg Alloys Heated and Held in Different Gases. MATERIALS TRANSACTIONS. 2009; 50 (10):2366-2372.
Chicago/Turabian StylePo-Chen Chen; Teng-Shih Shih; Chin-Yie Wu. 2009. "Thermally Formed Oxides on Al-2 and 3.5 mass% Mg Alloys Heated and Held in Different Gases." MATERIALS TRANSACTIONS 50, no. 10: 2366-2372.
Li Wu Huang; Yeong Jern Chen; Teng Shih Shih; Lih Ren Hwang. 10.4028/0-87849-408-1.1311. Inactive DOIs 2008, 1 .
AMA StyleLi Wu Huang, Yeong Jern Chen, Teng Shih Shih, Lih Ren Hwang. 10.4028/0-87849-408-1.1311. Inactive DOIs. 2008; ():1.
Chicago/Turabian StyleLi Wu Huang; Yeong Jern Chen; Teng Shih Shih; Lih Ren Hwang. 2008. "10.4028/0-87849-408-1.1311." Inactive DOIs , no. : 1.
Thermogravimetric analysis (TGA) testing was used to measure the change in weight of polished samples of Al–XSi (X = 0 and 1.2 mass%) alloys. The samples were heated at 843 K for 6 h in dry air or nitrogen gas. X-ray diffraction was used to monitor the formation of the oxide films on the surface of the samples. The surface oxide films were more compact after the Al alloy samples were heated in air, and the oxide films showed some cracks after being heated in nitrogen gas. The thermally formed surface oxide films on the Al–1.2 mass% Si alloy samples heated in air and in nitrogen gas possessed loose structures, which comprised mainly γ-alumina, diaspore, and gibbsite, along with metallic silicon and/or aluminum. The weight variation curve of the films appeared serrated; this can be attributed to chain reactions (3Si + 3O2 → 3SiO2 + 4Al → 3Si + 2Al2O3) that occurred within the film.
Teng Shih Shih; Po-Chen Chen; Chi-Chou Huang. Thermally Formed Oxide Films on Al–XSi Alloys Heated in Different Gases. Oxidation of Metals 2008, 70, 69 -83.
AMA StyleTeng Shih Shih, Po-Chen Chen, Chi-Chou Huang. Thermally Formed Oxide Films on Al–XSi Alloys Heated in Different Gases. Oxidation of Metals. 2008; 70 (1):69-83.
Chicago/Turabian StyleTeng Shih Shih; Po-Chen Chen; Chi-Chou Huang. 2008. "Thermally Formed Oxide Films on Al–XSi Alloys Heated in Different Gases." Oxidation of Metals 70, no. 1: 69-83.
In this study the reflectance and nano-structure of anodized aluminum oxide (AAO) films that formed on Al1050 alloys in a 15% w/w sulphuric acid solution were examined. It was found that AAO films that formed under a high bath temperature and/or low anodic current density had a high pore density (count dm− 2). The reflectance of AAO films formed at different anodizing times is a function of their thickness. The surface reflectance spectra showed interference when the AAO films exceeded a critical thickness (~ 100 nm). The reflectance curves oscillated and were affected by the pore density. We calculated the refractive index (n) and extinction coefficient (k) of the films based on the measured film thickness and reflectance. We can see from the experimental results that reflectance decreased with increasing thickness, while increasing pore density led to an increased refractive index but decreased extinction coefficient.
Teng-Shih Shih; Pai-Sheng Wei; Yung-Sen Huang. Optical properties of anodic aluminum oxide films on Al1050 alloys. Surface and Coatings Technology 2008, 202, 3298 -3305.
AMA StyleTeng-Shih Shih, Pai-Sheng Wei, Yung-Sen Huang. Optical properties of anodic aluminum oxide films on Al1050 alloys. Surface and Coatings Technology. 2008; 202 (14):3298-3305.
Chicago/Turabian StyleTeng-Shih Shih; Pai-Sheng Wei; Yung-Sen Huang. 2008. "Optical properties of anodic aluminum oxide films on Al1050 alloys." Surface and Coatings Technology 202, no. 14: 3298-3305.
Blasting can eliminate or change the surface texture of as-rolled aluminum alloy by indentation to roughen the alloy’s surface. We investigated the effects of the blasting conditions on the glossiness and reflectance of Al1050-H16 and Al5052-H32 alloys in this study. As-rolled sheets were blasted at various pressures, and then removed for sequential cleaning, chemical polishing, and anodizing steps. After each step the samples were measured by micro-TRI-gloss meter and spectrophotometer to compare the effects produced by the abrasive powders and processing variables. Polyhedral alumina and round iron powders were used as the blasting media. The glossiness (Gs(60°)) decreased as the root mean square roughness (Rq) increased, regardless of the shape of the abrasive powders. The abrasives powders could cause wear and/or fracturing during the blasting process as well as fine debris, which could become embedded in the blasted surface. When an aluminum alloy was blasted with iron powders, the glossiness value after alkaline etching and chemical polishing was greater than that after being blasted with alumina; while the anodized Al5052-H32 alloy’s surface became more yellowish in color.
Teng-Shih Shih; Pai-Sheng Wei; Chih-Liang Wu. Effect of abrasives on the glossiness and reflectance of anodized aluminum alloys. Journal of Materials Science 2008, 43, 1851 -1858.
AMA StyleTeng-Shih Shih, Pai-Sheng Wei, Chih-Liang Wu. Effect of abrasives on the glossiness and reflectance of anodized aluminum alloys. Journal of Materials Science. 2008; 43 (6):1851-1858.
Chicago/Turabian StyleTeng-Shih Shih; Pai-Sheng Wei; Chih-Liang Wu. 2008. "Effect of abrasives on the glossiness and reflectance of anodized aluminum alloys." Journal of Materials Science 43, no. 6: 1851-1858.
Teng-Shih Shih; Po-Chen Chen; Wei-Shian Tsai. Tensile Properties of Forged Direct-Squeeze-Cast Al-(6.0∼8.0 mass%)Si-(0.3∼0.52 mass%)Mg Alloy. MATERIALS TRANSACTIONS 2008, 49, 737 -745.
AMA StyleTeng-Shih Shih, Po-Chen Chen, Wei-Shian Tsai. Tensile Properties of Forged Direct-Squeeze-Cast Al-(6.0∼8.0 mass%)Si-(0.3∼0.52 mass%)Mg Alloy. MATERIALS TRANSACTIONS. 2008; 49 (4):737-745.
Chicago/Turabian StyleTeng-Shih Shih; Po-Chen Chen; Wei-Shian Tsai. 2008. "Tensile Properties of Forged Direct-Squeeze-Cast Al-(6.0∼8.0 mass%)Si-(0.3∼0.52 mass%)Mg Alloy." MATERIALS TRANSACTIONS 49, no. 4: 737-745.
Teng-Shih Shih; Jyun-Bo Liu; Pai-Sheng Wei. Oxide films on magnesium and magnesium alloys. Materials Chemistry and Physics 2007, 104, 497 -504.
AMA StyleTeng-Shih Shih, Jyun-Bo Liu, Pai-Sheng Wei. Oxide films on magnesium and magnesium alloys. Materials Chemistry and Physics. 2007; 104 (2-3):497-504.
Chicago/Turabian StyleTeng-Shih Shih; Jyun-Bo Liu; Pai-Sheng Wei. 2007. "Oxide films on magnesium and magnesium alloys." Materials Chemistry and Physics 104, no. 2-3: 497-504.