'classical' superplasticity of SiAION ceramics

摘要

"Classical" superplasticity of SiAION ceramics with the moninal composition (Y_xLi_y)_0.6/(3x+y)Si_8.9Al_3.1O_2.5N_13.5 is reported in this study. During deformation, these materials exhibit little microstructural evolution, with negligible growth of elongated β'-phase grains and minimal texture formation. Excellent formabilities are obtained in the tem- perature range of 1500°-1600 deg C in compression, where a strain rate of 10~2 s~1 has been achieved, and in punch stretching, where a strain rate of 1.2x10~3 s~1 has been used successfully.