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张雪华,赵永庆,曾卫东.细晶Ti-6Al-4V 宽幅板材的超塑性变形机理及组织演变[J].稀有金属材料与工程(英文),2020,49(2):391~397.[zhang xuehua,zhao yongqing and zeng weidong.Superplastic deformation mechanism and simultaneous microstructure evolution of fine grained Ti-6Al-4V wide sheet[J].Rare Metal Materials and Engineering,2020,49(2):391~397.]
Superplastic deformation mechanism and simultaneous microstructure evolution of fine grained Ti-6Al-4V wide sheet
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Received:July 18, 2019  Revised:October 17, 2019
DOI:
Key words: Ti-6Al-4V wide sheet  Superplasticity  Deformation mechanism  Anisotropy
Foundation item:Foundation item: National Natural Science Foundation of China(51471136)
Author NameAffiliation
zhang xuehua,zhao yongqing and zeng weidong  
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Abstract:
      The superplasticity of fine grained Ti-6Al-4V wide sheet was investigated by constant strain rate tensile method in this work. The superplastic tensile tests were carried out at temperatures ranging from 1103K to 1223K and strain rates from 3.2×10-4 s-1 to 1×10-2s-1. The tensile elongation to failure values between 100% and 604% were obtained. Microstructure evolution and deformation mechanism were analyzed. The main deformation mechanism was grain boundary sliding, accommodated by matrix dislocation movement and the intragranular slip of β phase. It was also found that the Ti-6Al-4V wide sheet showed anisotropy when deformed at lower temperatures, which was obviously reduced when deformed at higher temperatures.