(西安高新技術(shù)研究所601室，西安 710025)
摘 要: 不連續(xù)屈服行為是近α、β鈦合金高溫變形過程中出現(xiàn)的一種重要現(xiàn)象，對鈦合金高溫變形的力學特性有重要的影響，引起了材料研究者越來越廣泛的關(guān)注。綜合目前發(fā)生不連續(xù)屈服的鈦合金高溫變形研究現(xiàn)狀，介紹了下屈服點前、后的流動曲線特性；分析了影響不連續(xù)屈服的主要因素、不連續(xù)屈服發(fā)生的相關(guān)機理；探討了發(fā)生不連續(xù)屈服的鈦合金高溫變形機制和考慮不連續(xù)屈服現(xiàn)象時鈦合金高溫變形的本構(gòu)模型構(gòu)建；并在此基礎(chǔ)上提出了當前研究中存在的不足和值得進一步研究的內(nèi)容。
關(guān)鍵字: 不連續(xù)屈服；鈦合金；高溫變形；變形機理；本構(gòu)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
