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.