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Microtwin formation in the α phase of duplex titanium alloys affected by strain rate |
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| Authors: | Yi-Hsiang LinShu-Ming Wu Fang-Hsin KaoShing-Hoa Wang Jer-Ren YangChia-Chih Yang Chuan-Sheng Chiou |
| Affiliation: | a Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, No. 2 Pei Ning Road, Keelung 20224, Taiwan b Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan c Department of Mechanical Engineering, Yuan Ze University, Taoyuan 32003, Taiwan |
| Abstract: | The effect of tensile strain rate on deformation microstructure was investigated in Ti-6-4 (Ti-6Al-4V) and SP700 (Ti-4.5Al-3V-2Mo-2Fe) of the duplex titanium alloys. Below a strain rate of 10−2 s−1, Ti-6-4 alloy had a higher ultimate tensile strength than SP700 alloy. However, the yield strength of SP700 was consistently greater than Ti-6-4 at different strain rates. The ductility of SP700 alloy associated with twin formation (especially at the slow strain rate of 10−4 s−1), always exceeded that of Ti-6-4 alloy at different strain rates. It is caused by a large quantity of deformation twins took place in the α phase of SP700 due to the lower stacking fault energy by the β stabilizer of molybdenum alloying. In addition, the local deformation more was imposed on the α grains from the surrounding β-rich grains by redistributing strain as the strain rate decreased in SP700 duplex alloy. |
| Keywords: | Duplex titanium alloy Twin Dislocation |
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