Strain rate sensitivity of tensile properties in high Nb containing TiAl alloys

查看全文 作　　者：Jianfeng Gao Xiangjun Xu Junpin Lin Xiping Song Yanli Wang Guoliang [1]Chen 机构地区：[1]State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China 出　　处：《Journal of University of Science and Technology Beijing》索引2005年第12卷第6期,共5页 基　　金：This work was financially supported by the National Natural Science Foundation of China (No.50274005) and the State Key Projectfor Fundamental Research Developing Plan (No.G2000067206-2). 摘　　要：The effect of strain rate on the yield strength of high Nb containing TiAl alloy was studied. The results show that the strain rate sensitivity varies with the test temperature, and the yield strength is not sensitive to the strain rate at room temperature but sig- nificantly sensitive to the strain rate at high temperature. An increase of the strain rate or a decrease of the temperature results in an obvious change of fracture mode. It is found that the strain rate sensitivity of this alloy varying with temperature is due to the dislo- cation climb generated at high temperature. 关 键 词：钛铝合金 应变率 拉伸性能 热激发 铌