(哈爾濱工業(yè)大學(xué)材料科學(xué)與工程學(xué)院, 哈爾濱 150001)
摘 要: 對(duì)1 020、950和900 ℃空冷的TC4合金在-196～350 ℃間進(jìn)行了熱循環(huán)試驗(yàn),測(cè) 定了熱循環(huán)前后的拉伸性能。結(jié)果表明: 經(jīng)1 000次熱循環(huán)后強(qiáng)度上升, 塑性下降,合金中的位錯(cuò)密度增大，形變孿晶的數(shù)量增多，其中950 ℃空冷合金的強(qiáng)度上升幅度最大, 剩余塑性也最大。
關(guān)鍵字: 鈦合金 熱循環(huán) 拉伸性能 顯微組織
（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
