Abstract: Glass-ceramic is a new kind of substrate for hard disk of computer. In recent years, the mostly used ultra-precision machining methods are lapping and polishing. In this paper, the mechanism of brittle-ductile transition of glass-ceramics at different low temperatures was studied. Formation, propagation,length of crack and hardness of glass-ceramics were investigated at different temperature by means of Vickers indentation. The effect of temperature on the mechanism of its brittle-ductile transition was analyzed. Results show that with the increase of load at different temperatures, glass-ceramic goes through the ductile to brittle transition. Besides, with the decrease of temperature its hardness increases gradually,and the length of crack decreases.

Key words: glass-ceramic%low temperature%indentation method%brittle-ductile transition