Internal state variable models for micro-structure in high temperature deformation of titanium alloys

作     者：LUO Jiao LI MiaoQuan LI XiaoLi 

作者机构：School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2008年第51卷第11期

页      面：1921-1929页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：the National Natural Science Foundation of China (Grant No. 50475144) the NPU Foundation for Research (Grant No. NPU-FFR-006) the National Basic Research Program of China ("973") (Grant No. G20000672) 

主　　题：titanium alloy grain size dislocation density models parameter recognition 

摘      要：There exists an interaction between microstructural evolution and deformation behavior in high temperature deformation of titanium alloys. And the microstruc- ture of titanium alloys is very sensitive to the process parameters of plastic de- formation process. In this paper, on the basis of plastic deformation mechanism of metals and alloys, a microstructural model including dislocation density rate equa- tion and grain growth rate equation is established with the dislocation density rate being an internal state variable. Applying the model to the high temperature de- formation process of Ti60 titanium alloy, the average relative errors of grain sizes between the experiments and the predictions are 9.47% for sampled data, and 13.01% for non-sampled data.