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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Zhao, Z., Guo, H., Chen, L. et al. Superplastic behaviour and microstructure evolution of a fine-grained TA15 titanium alloy. Rare Metals 28, 523–527 (2009). https://doi.org/10.1007/s12598-009-0101-8
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DOI: https://doi.org/10.1007/s12598-009-0101-8