Dynamic globularization kinetics during hot working of TA15 titanium alloy with colony microstructure  

片状TA15钛合金在热变形过程中的动态球化动力学(英文)

作　　者：吴成宝[1] 杨合[1] 樊晓光[1] 孙志超[1] 

机构地区：[1]西北工业大学材料学院凝固技术国家重点实验室,西安710072

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第9期1963-1969,共7页中国有色金属学报（英文版）

基　　金：Project(50935007)supported by the National Natural Science Foundation of China;Project(2010CB731701)supported by the National Basic Research Program of China

摘　　要：The dynamic globularization kinetics of TA15（Ti-6Al-2Zr-1Mo-1V） titanium alloy with a colony α microstructure during deformation at temperature range of 860-940 ℃ and strain rate range of 0.01-10 s-1 was quantitatively studied through isothermal compression tests.It is found that the dynamic globularization kinetics and the kinetics rate of TA15 are sensitive to deformation parameters.The dynamic globularized fraction increases with increasing strain,temperature but decreasing strain rate.The variation of globularized fraction with strain approximately follows an Avrami type equation.Using the Avrami type equation,the initiation and completion strains for dynamic globularization of TA15 were predicted to be 0.34-0.59 and 3.40-6.80.The kinetics rate of dynamic globularization increases with strain at first,then decreases.The peak value of kinetics rate,which corresponds to 20%-33% globularization fraction,increases with increasing temperature and decreasing strain rate.通过等温热压缩实验定量地研究片层TA15钛合金在860～940℃,应变速率0.01～10s?1范围内的动态球化动力学。研究发现TA15钛合金的动态球化动力学和动力学速率对热变形参数很敏感。动态球化率随应变的增加、温度的升高和应变速率的降低而增大,且应变的变化规律遵循动力学Avrami模型曲线。通过模型预测球化开始应变和完全球化所需要的应变分别为0.34～0.59和3.40～6.80。动态球化动力学速率随着应变的增加呈现先增大后减小的趋势。球化动力学速率的峰值对应的球化率为20%～33%,且随着温度的升高和应变速率的降低而增大。

关 键 词：TA15 titanium alloy dynamic globularization KINETICS STRAIN kinetics rate 

分 类 号：TG146.23[一般工业技术—材料科学与工程]