Yield Strength of Transparent MgAl2O4 Nano-Ceramic at High Pressure and Temperature
Jie Zhang1, Tiecheng Lu, Xianghui Chang
1Department of Physics and Key Laboratory for Radiation Physics and Technology of Ministry of Education, Sichuan University, 610064, Chengdu, People's Republic of China. lutiecheng@scu.edu.cn.
Abstract:
We report here experimental results of yield strength and stress relaxation measurements of transparent MgAl2O4 nano-ceramics at high pressure and temperature. During compression at ambient temperature, the differential strain deduced from peak broadening increased significantly with pressure up to 2 GPa, with no clear indication of strain saturation. However, by then, warming the sample above 400°C under 4 GPa, stress relaxation was obviously observed, and all subsequent plastic deformation cycles are characterized again by peak broadening. Our results reveal a remarkable reduction in yield strength as the sintering temperature increases from 400 to 900°C. The low temperature for the onset of stress relaxation has attracted attention regarding the performance of transparent MgAl2O4 nano-ceramics as an engineering material.
