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Materials 2018, 11(7), 1212; https://doi.org/10.3390/ma11071212

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

1
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2
Research and development center, Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China
*
Author to whom correspondence should be addressed.
Received: 24 May 2018 / Revised: 9 July 2018 / Accepted: 10 July 2018 / Published: 13 July 2018
(This article belongs to the Special Issue Deformation, Fatigue and Fracture of Materials)
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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. View Full-Text
Keywords: Ti-6Al-4V alloy; deformation activation energy; strain rate sensitivity exponent; low-temperature superplasticity; deformation mechanism map Ti-6Al-4V alloy; deformation activation energy; strain rate sensitivity exponent; low-temperature superplasticity; deformation mechanism map
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhou, G.; Chen, L.; Liu, L.; Liu, H.; Peng, H.; Zhong, Y. Low-Temperature Superplasticity and Deformation Mechanism of Ti-6Al-4V Alloy. Materials 2018, 11, 1212.

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