MECHANICAL-PROPERTIES AND INTERFACIAL MICROSTRUCTURE OF SIC WHISKER-REINFORCED ZRO2-Y2O3 COMPOSITES

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	MECHANICAL-PROPERTIES AND INTERFACIAL MICROSTRUCTURE OF SIC WHISKER-REINFORCED ZRO2-Y2O3 COMPOSITES
	F. Ye; T. C. Lei; Y. C. Zhao; Y. Zhou; J. Y. Dai
	1995
发表期刊	Ceramics International
ISSN	0272-8842
卷号	21 期号:4 页码:243-247
摘要	Mechanical properties and fracture mechanisms of 20 vol% SiC whisker-reinforced ZrO2 (Y2O3) composites were investigated. The phase composition, fractography and the microstructure of the whisker-matrix interface were studied by XRD, SEM, TEM and HREM. The results show that flexural strength and fracture toughness of SiCw/ZrO2 (with 2 mol% Y2O3) composites increase by 453 MPa and 2.6 MPa m(1/2), respectively. However, in the composites with 6 mol% Y2O3, the increment is only 17 MPa and 1.6 MPa m(1/2), respectively. It reveals that the ZrO2 (2 mol% Y2O3) composites have a good toughening effect by incorporating SiC whiskers. HREM observations indicate that the whiskers in ZrO2 (2 mol% Y2O3) composites are directly bonded with the ZrO2 matrix, only few atom disorder zones exist at the interface. In contrast, for ZrO2 (6 mol% Y2O3) composites, there is a thin, uniform layer of amorphous phase at the interface between SiC whisker and ZrO2 matrix, indicating that high Y2O3 content promotes the formation of an interfacial layer. The study of fracture surfaces by SEM indicates that the main toughening mechanisms in SiCw/ZrO2 (with 2 mol% Y2O3) composites are crack deflection, crack bridging, whisker pull-out and dynamic t-->m transformation. Crack deflection is the main toughening mechanism in SiCw/ZrO2, (with 6 mol% Y2O3) composites.
部门归属	acad sinica,inst met res,shenyang 110015,peoples r china.;ye, f (reprint author), harbin inst technol,dept met & technol,harbin 150001,peoples r china
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/38732
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	F. Ye,T. C. Lei,Y. C. Zhao,et al. MECHANICAL-PROPERTIES AND INTERFACIAL MICROSTRUCTURE OF SIC WHISKER-REINFORCED ZRO2-Y2O3 COMPOSITES[J]. Ceramics International,1995,21(4):243-247.
APA	F. Ye,T. C. Lei,Y. C. Zhao,Y. Zhou,&J. Y. Dai.(1995).MECHANICAL-PROPERTIES AND INTERFACIAL MICROSTRUCTURE OF SIC WHISKER-REINFORCED ZRO2-Y2O3 COMPOSITES.Ceramics International,21(4),243-247.
MLA	F. Ye,et al."MECHANICAL-PROPERTIES AND INTERFACIAL MICROSTRUCTURE OF SIC WHISKER-REINFORCED ZRO2-Y2O3 COMPOSITES".Ceramics International 21.4(1995):243-247.