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Yield Strength of Transparent MgAl2O4 Nano-Ceramic at High Pressure and Temperature

Author(s): Zhang Jie | Lu Tiecheng | Chang Xianghui | Jiang Shengli | Wei Nian | Qi Jianqi

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 5;
Issue: 8;
Start page: 1329;
Date: 2010;
Original page

Keywords: Transparent MgAl2O4 nano-ceramics | High pressure/temperature | Differential strain | Yield strength | Stress relaxation

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.
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