Abstract：Magnesium aluminum spinel is a hard, brittle and transparent ceramic material. In order to solve its difficult machining problem, ultra–precision laser–assisted turning technology is used in precision machining. Therefore, Vickers indentation experiments and scratch experiments at high temperature is of great significance for the study of the processing property of magnesium aluminum spinel at high temperature. When the processing environment temperature increased from 23℃ to 283℃, the Vickers microhardness decreased from 15.85GPa to 7.66GPa, and ductile–to–brittle transition depth increased from 0.51μm to 0.80μm. The method of material removal in the brittle mode and plastic mode at high temperature was explored. By observing the surface morphology of the scratches, the depth of the subsurface cracks decreased with increasing temperature, which provided a certain technical basis for ultra–precision laser–assisted turning technology.
2022, 
