(哈尔滨工业大学材料科学与工程学院, 哈尔滨 150001)
摘 要: 对1 020、950和900 ℃空冷的TC4合金在-196～350 ℃间进行了热循环试验,测 定了热循环前后的拉伸性能。结果表明: 经1 000次热循环后强度上升, 塑性下降,合金中的位错密度增大，形变孪晶的数量增多，其中950 ℃空冷合金的强度上升幅度最大, 剩余塑性也最大。
关键字: 钛合金 热循环 拉伸性能 显微组织
（School of Materials and Engineering，Harbin Institute of Technology, Harbin 150001）
Abstract:The thermal cycling tests between -196 and 350 ℃ were performed on the TC4 alloy air cooled from 1 020, 950 and 900 ℃. The tensile properties before and after thermal cycling were evaluated. Experimental results show that after 1 000 thermal cycles , the strength increases, the ductility decreases and the dislocation density or amount of deformation twins increase, among which the specimens air cooled from 950 ℃ have the largest increase in strength and have the largest residual ductility.
Key words: titanium alloy thermal cycling tensile property microstructure
