Microstructure and Creep Behavior of a Y-α-β Sialon Composite

Abstract

Abstract: Four-point bending creep behaviour of a Y-α-β sialon composite with YAG as the intergranular phase and
with the theoretical α/β ratio of 65/35 was studied at 1250～1350℃ and stresses of 110～290MPa in air. The stress exponents at 1250, 1300 and 1350℃ were found to be 1.31, 1.49 and
1.62, respectively, and creep activation energy was 677kJ·mol^-1. Cavities were found mainly on multi grain junctions. Grain boundary
diffusion coupled with sliding was identified to be the dominant creep deformation mechanism. The creep rate exponent, p, in Monkman-Grant relation
was 1.6, and the nucleation/growth, coalescence and linkage of multi-grain-junction cavities were responsible for the creep rupture.

Key words: sialon composite, creep, microstructure, oxidation, phase transformation

CLC Number:

TQ17

LIN Ming-Tong,JIANG Dan-Yu,WANG Lin,RUAN Mei-Ling,SHI Jian-Lin. Microstructure and Creep Behavior of a Y-α-β Sialon Composite[J]. Journal of Inorganic Materials.

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