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Materials (Basel). 2018 Jul 13;11(7). pii: E1212. doi: 10.3390/ma11071212.

Low-Temperature Superplasticity and Deformation Mechanism of Ti-6Al-4V Alloy.

Author information

1
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China. zhouge19850131@163.com.
2
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China. chenlijia@sut.edu.
3
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China. liulirong@sut.edu.cn.
4
Research and development center, Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China. hangtian402@163.com.
5
Research and development center, Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China. phl12616040811@126.com.
6
Research and development center, Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China. lizhongquan401@163.com.

Abstract

The low-temperature superplastic tensile behavior and the deformation mechanisms of Ti-6Al-4V alloy are investigated in this paper. Through the experiments carried out, elongation to failure (δ) is calculated and a set of values are derived that subsequently includes the strain rate sensitivity exponent (m), deformation activation energy (Q) at low-temperature superplastic deformation, and the variation of δ, m and Q at different strain rates and temperatures. Microstructures are observed before and after superplastic deformation. The deformation mechanism maps incorporating the density of dislocations inside grains at temperatures of 973 and 1123 K are drawn respectively. By applying the elevated temperature deformation mechanism maps based on Burgers vector compensated grain size and modulus compensated stress, the dislocation quantities and low-temperature superplastic deformation mechanisms of Ti-6Al-4V alloy at different temperatures within appropriate processing regime are elucidated.

KEYWORDS:

Ti-6Al-4V alloy; deformation activation energy; deformation mechanism map; low-temperature superplasticity; strain rate sensitivity exponent

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