High-Temperature Compressive Deformation of SiAlON Polycrystals Prepared without Additives
The high-temperature deformation of dense nano-sized Ca-α SiAlON and submicron- sized β-SiAlON polycrystals were investigated by compression tests. These polycrystals were fabricated from Ca-α SiAlON and β-SiAlON nano powders respectively, and contained almost no intergranular glass phase. Both SiAlONs exhibited large plastic deformations with the stress exponent n ~1 in the higher stress region, and n ~2 in the lower stress region. Shear-thickening creep (n < 1), which has been reported in liquid contained SiAlONs, was not observed.
Katsutoshi Komeya, Yi-Bing Cheng, Junichi Tatami and Mamoru Mitomo
K. Chihara et al., "High-Temperature Compressive Deformation of SiAlON Polycrystals Prepared without Additives", Key Engineering Materials, Vol. 403, pp. 117-120, 2009