TY - JOUR
T1 - Superplastic behavior of fine-grained β-silicon nitride material under compression
AU - Zhan, Guo Dong
AU - Mitomo, Mamoru
AU - Nishimura, Toshiyuki
AU - Xie, Rong Jun
AU - Sakuma, Taketo
AU - Ikuhara, Yuichi
PY - 2000
Y1 - 2000
N2 - The deformation behavior of a hot-pressed, fine-grained β-Si3N4 ceramic was investigated in the temperature range 1450°-1650 °C, under compression, and the results for strain rate and temperature dependence of the flow stress are presented here. The present results show that the material is capable of high rates of deformation (approximately 10-4-10-3s-1) within a wide range of deformation temperatures and under a pressure of 5-100 MPa; no strain hardening occurs in the material, even at slow deformation rates, because of its stable microstructure; Newtonian flow occurs, with a stress exponent of approximately unity; and the material has activation energy values for flow in the range 344-410 kJ·mol-1. Grain-boundary sliding and grain rotation, accommodated by viscous flow, might be the mechanisms of superplasticity for the present material.
AB - The deformation behavior of a hot-pressed, fine-grained β-Si3N4 ceramic was investigated in the temperature range 1450°-1650 °C, under compression, and the results for strain rate and temperature dependence of the flow stress are presented here. The present results show that the material is capable of high rates of deformation (approximately 10-4-10-3s-1) within a wide range of deformation temperatures and under a pressure of 5-100 MPa; no strain hardening occurs in the material, even at slow deformation rates, because of its stable microstructure; Newtonian flow occurs, with a stress exponent of approximately unity; and the material has activation energy values for flow in the range 344-410 kJ·mol-1. Grain-boundary sliding and grain rotation, accommodated by viscous flow, might be the mechanisms of superplasticity for the present material.
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U2 - 10.1111/j.1151-2916.2000.tb01283.x
DO - 10.1111/j.1151-2916.2000.tb01283.x
M3 - Article
AN - SCOPUS:0033894689
SN - 0002-7820
VL - 83
SP - 841
EP - 847
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 4
ER -