Superplastic behaviour and microstructure evolution of a fine-grained TA15 titanium alloy |
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Authors: | Zhanglong Zhao Hongzhen Guo Li Chen Zekun Yao |
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Affiliation: | School of Material Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China |
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Abstract: | The fine-grained microstructure of TA15 titanium alloy was prepared through two-step forging technology combined with high
and low temperatures, and a transnormal superplastic elongation of more than 2000% was obtained. The superplastic behaviour
and microstructure evolution were systematically researched at different temperatures and strain rates through superplastic
tensile test. The results indicate that the fine-grained TA15 alloy exhibits superplasticity at temperatures of 760–980°C
and initial strain rates from 1.1 × 10?2 to 5.5 × 10?5 s?1. The optimal superplastic conditions are 940°C and 3.3 × 10?4 s?1, in which the average elongation is 2526% and the maximum elongation is 2743%. During superplastic deformation, dynamic recovery
and recrystallization occur obviously, and the corporate effect of strain hardening and recrystallization softening decides
the superplastic ability directly. |
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Keywords: | titanium alloys superplasticity microstructure elongation |
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