(1. 宝钛集团有限公司，宝鸡 721014；2. 宝鸡钛业股份有限公司，宝鸡 721014；
3. 中南大学 材料科学与工程学院，长沙 410083)
摘 要: 对高强高韧TC18钛合金的高温蠕变行为进行研究，蠕变实验的外加应力为200、250和300 MPa，蠕变温度为400和500 ℃，蠕变持续时间为72 h。借助透射电镜观察蠕变后合金的微观组织。结果表明：高温高应力状态下，位错攀移在蠕变过程中起主要作用；在高温低应力或低温高应力状态下，合金的蠕变机理为位错滑移。
关键字: TC18钛合金；蠕变行为；微观组织；位错攀移；位错滑移
（1. Bao Ti Group Co., Ltd., Baoji 721014, China;
2. Baoji Titanium Industry Co., Ltd., Baoji 721014, China;
3. School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The high temperature creep behavior of TC18 titanium alloy was studied. The conditions of creep experiment were as follows: applied stress 200, 250 and 300 MPa, creep temperature 400 and 500 ℃, holding time 72 h. Transmission electric microscope was used to observe the microstructure evolution of TC18 alloy after creep testing. The results show that, at higher temperature and higher applied stress, dislocation climbing plays a key role during creep deformation behavior; at higher temperature and lower applied stress, or at lower temperature and higher applied stress, the creep mechanism of alloy is dislocation slipping.
Key words: TC18 titanium alloy; creep behavior; microstructure; dislocation climbing; dislocation slipping
