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

Materials

Haijian Liu¹  Yiping Zhong¹  Heli Peng¹  Lirong Liu²  Ge Zhou²  Lijia Chen² 

[1] Research and development center, Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China;School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;

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

DOI  :  10.3390/ma11071212

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown