中文摘要：

对固溶处理后的Ti-10Mo-8V-1Fe-3.5Al （TB3）合金施加弹性压应力,同时在500℃下进行时效处理.TEM观察结果表明：在应力时效的样品里大部分晶粒中α片相互平行排列,即只有一种α片变体,而在未施加压应力常规时效的样品中出现了数种α片的变体.选择了两种强度相当的热处理状态的TB3试样进行低周疲劳测试,一种是500℃自由时效9h,另一种是在约200 MPa压应力下,500℃时效6h.低周疲劳测试结果表明：在同一应变幅下,应力时效试样具有较高的低周疲劳寿命.

英文摘要：

After solution treatment,Ti-10Mo-8V-1Fe-3.5Al （TB3） alloy was aged at 500 ℃ under a compressive stress.TEM results show that several α variants are observed in conventionally aged samples.However,in the stress-aged TB3 samples,most α plates are parallel to each other in one β grain,which indicates a variant selection effect.Two kinds of TB3 samples were selected for low cycle fatigue tests,which had been heat treated to the same strength level.The one was conventionally aged at 500 ℃ for 9 h,and the other was aged at 500℃ for 6 h with about 200 MPa compressive stress.Low cycle fatigue （LCF） test results show that the stress-aged TB3 samples exhibit a longer LCF lifetime than the conventionally aged ones.