(西安高新技术研究所601室，西安 710025)
摘 要: 不连续屈服行为是近α、β钛合金高温变形过程中出现的一种重要现象，对钛合金高温变形的力学特性有重要的影响，引起了材料研究者越来越广泛的关注。综合目前发生不连续屈服的钛合金高温变形研究现状，介绍了下屈服点前、后的流动曲线特性；分析了影响不连续屈服的主要因素、不连续屈服发生的相关机理；探讨了发生不连续屈服的钛合金高温变形机制和考虑不连续屈服现象时钛合金高温变形的本构模型构建；并在此基础上提出了当前研究中存在的不足和值得进一步研究的内容。
关键字: 不连续屈服；钛合金；高温变形；变形机理；本构模型
（601 Staff Room, Xi’an Hi-Tech Institute, Xi’an 710025, China）
Abstract:The discontinuous yielding behavior is one of the important phenomenas for near α and β titanium alloys during hot deformation. It has the important effect on the mechanical behavior of titanium alloys during hot deformation, and there has been a growing interest on this phenomenon. With a view to the current researches of high temperature deformation of titanium alloys with discontinuous yielding, the characteristics of flow stress curves before and after the lower yield point were introduced. The dominating influencing factors and theoretic mechanism on the discontinuous yielding were analyzed. The deformation mechanism of titanium alloys with discontinuous yielding during hot deformation was discussed as well as the methods to develop the constitutive model. At last the current shortage and future research contents were also proposed.
Key words: discontinuous yielding; titanium alloy; hot deformation; deformation mechanism; constitutive model
