title: Yield Strength of Transparent MgAl2O4 Nano-Ceramic at High Pressure and Temperature.
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.
authors.affiliation: Department 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.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.forename: Tiecheng
authors.initials: T
authors.lastname: Lu
authors.forename: Xianghui
authors.initials: X
authors.lastname: Chang
authors.forename: Shengli
authors.initials: S
authors.lastname: Jiang
authors.forename: Nian
authors.initials: N
authors.lastname: Wei
authors.forename: Jianqi
authors.initials: J
authors.lastname: Qi