Microstructures and Toughening Mechanisms of Alumina-Matrix Composites

Abstract

Abstract: Various toughening methods, such as transformation toughening, transformation-whiskerreinforcement and transformation-particle reinforcement were used toimprove the mechanical properties of alumina.The fracture behaviors and toughening mechanisms of the composites werc studied by measuringmechanical properties, analyzing microstructures and comparing fracture morphologies. The mechanical propertiesof testing materials arc closely related with the morphologies of fracturc surfaces. The two tougheningmcchanisms in joint toughening composites will affect with each other, and produce an effect of cooperative toughening on certain conditions. The dislocations were observed in matrix of meterials undergoing property test. The tearing ridges, which are created generally in ductile fracture, were also observed on fracture surface in ZTA material.

Key words: ceramic composite, toughening mechanism, microstructure, mechanical property

ZHOU Yang,ZHAN Guodong,XU Mingying ZHANG Yizeng. Microstructures and Toughening Mechanisms of Alumina-Matrix Composites[J]. Journal of Inorganic Materials.

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Microstructures and Toughening Mechanisms of Alumina-Matrix Composites

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