TC8钛合金等温压缩变形过程中的不连续屈服特征

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Bibliographic Details
Published in中国有色金属学报：英文版 Vol. 26; no. 6; pp. 1583 - 1588
Main Author 王柯 李淼泉
Format Journal Article
LanguageEnglish
Published 2016
Subjects
不连续屈服
动态理论
流动应力
钛合金
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ISSN1003-6326

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Bibliography:titanium alloy; flow stress; discontinuous yielding; dynamic theory
43-1239/TG
The discontinuous yielding phenomenon （DYP） during high temperature deformation was investigated based on the isothermal compression of TC8 titanium alloy. The DYP of TC8 titanium alloy was characterized by quantifying the yield drop of the DYP （△σUL） and ending strain of flow oscillation （εOSC） based on the flow stress？strain curves, and then the effect of deformation parameters on the △σUL and εOSC values was analyzed. The results show that the △σUL and εOSC values increase with the increase of strain rate. The effect of deformation temperature on the ？σUL value depends on the strain rate. Finally, the transmission electron microscope （TEM） observation shows the evidence for the dynamic theory, which ascribes the DYP to the generation of mobile dislocation at the grain boundary. Meanwhile, the optical microscope （OM） observation shows that both the primary α grain and β grain become smaller with the increase of strain, which well interprets the effect of deformation parameters on the △σUL and εOSC values.
Ke WANG, Miao-quan LI （School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China）
ISSN:1003-6326