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

作　　者：LUO Jiao LI MiaoQuan LI XiaoLi 

机构地区：[1]School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Science China(Technological Sciences)》2008年第11期1921-1929,共9页中国科学（技术科学英文版）

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)

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.There exists an interaction between microstructural evolution and deformation behavior in high temperature deformation of titanium alloys. And the microstructure of titanium alloys is very sensitive to the process parameters of plastic deformation process. In this paper, on the basis of plastic deformation mechanism of metals and alloys, a microstructural model including dislocation density rate equation and grain growth rate equation is established with the dislocation density rate being an internal state variable. Applying the model to the high temperature deformation 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.

关 键 词：TITANIUM alloy GRAIN size DISLOCATION density models parameter recognition 

分 类 号：TG146.23[一般工业技术—材料科学与工程]