TC6钛合金的高温拉伸蠕变行为研究  

Tensile Creep Behavior at High Temperature of TC6 Alloy

作　　者：李学雄[1] 夏长清[1] 戚延龄[1] 王志辉 牛国帅[1] 孙玮[1] 

机构地区：[1]中南大学,湖南长沙410083 [2]湖南三一重工总部,湖南长沙410083

出　　处：《稀有金属材料与工程》2013年第9期1901-1904,共4页Rare Metal Materials and Engineering

基　　金：总装备部预研基金(51312010311)

摘　　要：通过高温拉伸蠕变实验,获得了TC6合金的蠕变应变-时间曲线,并计算了其不同应力与不同温度下的稳态蠕变速率、应力指数及在350～450℃范围内的蠕变激活能,借助OM、TEM等手段对合金蠕变前后的显微组织进行了观察和分析,并在此基础上研究了其蠕变变形机制。结果表明:TC6合金的稳态蠕变速率随温度或恒应力的增加而增大,该合金在此温度范围内的蠕变受位错和扩散双重机制的控制,晶界滑动对蠕变也有一定的作用。Through the high temperature tensile creep experiments, the TC6 alloy creep strain-time curves were obtained, and the steady creep rate, the stress exponent and the apparent creep activation energy were calculated in the temperature range of 350-450 ℃ and different stresses. Microstructures of the alloy before and after creeping were analyzed by OM and TEM. On this basis the creep deformation mechanism was also studied. The results show that the steady creep rate increases with the increase of temperature or stress. The creep behavior of TC6 alloy in the range of 350-450 ℃ is controlled by double mechanisms of dislocation and diffusion. The boundary slip also has some effects on creeping

关 键 词：TC6 蠕变 显微组织 蠕变机制 

分 类 号：TG146.23[一般工业技术—材料科学与工程]