HOT DEFORMATION BEHAVIOR OF IN SITU TIB_2 REINFORCED 6351 AL COMPOSITES DURING COMPRESSION AT ELEVATED TEMPERATURES
The hot deformation behavior of in situ TiB2 reinforced 6351 Al composites synthesized by mixed salt reaction method was investigated by compression tests in the temperature range of 300-550℃ and strain rate range of 0.001-10 s-1. The microstructure evolution during compression was observed by employing transmission electron microscopy (TEM). The results show that, the flow stress decreases with decreasing strain rate and increasing temperature, and the activation energy is about 169.98 kJ/mol. Microstructure observation indicates that the complex dislocation structures were formed around the TiB2 paniculate at the lower temperature and the lower strain rate and their density is reducing with increasing temperature. Dynamic recovery and recrystalized structures were observed in the lower and higher deformation temperature, respectively. At the higher strain rate, the interface separation between TiB2 particulate and Al matrix alloy and TiB2 particulate cracking were found in this study. The main restoration mechanisms of TiB2/6351 composites during hot deformation are dynamic recovery and dynamic recrystallization.
TiB2/6351 composites dislocation dynamic recovery dynamic recrystallization
SHENGLI GUO DEFU LI DONG CHEN HAOWEI WANG
General Research Institute for Nonferrous Metals of Beijing, Beijing, Peoples Republic of China State Key Laboratory of Metal Matrix Composite, Shanghai Jiaotong University, Shanghai, Peoples Rep
国际会议
第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)
哈尔滨
英文
1432-1437
2008-09-03（万方平台首次上网日期，不代表论文的发表时间）