应变速率对TC11钛合金流动应力和微观组织的影响  

Effect of strain rate on flow stresses and microstructures of titanium alloy TC11 alloy

作　　者：李鑫[1] 鲁世强[1] 刘志和[1] 王克鲁[1] 赵为纲[1] 

机构地区：[1]南昌航空大学材料科学与工程学院

出　　处：《锻压技术》2007年第6期47-50,共4页Forging & Stamping Technology

基　　金：江西省自然科学基金(2007GQC1575);江西省材料科学与工程研究中心预研基金(ZX200601002)

摘　　要：利用THERMECMASTOR-Z型热模拟试验机,在温度为960和1050℃。应变速率为0.001～70 s^(-1)范围内对TC11钛合金进行了真应变为1.2的等温恒应变速率压缩实验,得到了高温塑性流动的真应力—真应变关系曲线特征。采用金相显微镜对其变形前后的微观组织进行了观察。结果表明,在960℃,较佳的应变速率为0.001 s^(-1),变形机制为超塑性;在1050℃,较佳的应变速率在0.1 s^(-1)附近,变形机制为动态再结晶。Isothermal constant strain rate compression tests on TC11 alloy in the strain rate range of 0. 001-70.0s^-1 were conducted up to a true strain of 1.2 using the THERMECMASTOR-Z hot working simulator, at 960 and 1050℃, respectively. The characteristic of true stress-true stain curves of high temperature plastic flow was obtained, and the microstructures of the pressed samples and those before pressing were investigated with metallographic microscope. The results indicate that the strain rates of 0. 001 and 0. 1 s^-1are preferable for hot working at 960 and 1050℃, respectively. Corresponding deformation mechanisms are superplasticity and dynamic recrystallization for the former and the later, respectively.

关 键 词：TC11钛合金 应变速率 流动应力 微观组织 变形机制 

分 类 号：TG115.53[金属学及工艺—物理冶金]