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Temperature-Dependent Toughening in Whisker-Reinforced Ceramics

Shaw, M. C. and Faber, K. T. (1987) Temperature-Dependent Toughening in Whisker-Reinforced Ceramics. In: Ceramic Microstructures ’86: Role of Interfaces. Materials Science Research. No.21. Plenum Press , New York, NY, pp. 929-938. ISBN 978-1-4612-9074-2.

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The mechanical response of whisker-reinforced ceramics, which is dominated by interfacial chemistry-arid stress, is expected to vary as thermal mismatch stresses diminish and grain boundary phases soften with increasing temperature. To examine the temperature dependence of the toughening process two silicon carbide whisker-reinforced systems have been studied: alumina and mullite. The systems represent a range of thermal mismatch conditions and potential crack-whisker interactions including crack bridging, whisker pull-out and crack deflection. For both systems, fracture toughness and hardness are measured as a function of temperature. The fracture toughness of both materials shows little change to 1100°C. However, post-mortem fractography indicates that limited pullout occurs in the mullite/SiC_w system at elevated temperatures. Only whiskers oriented normal to the fracture plane are pulled out without fracture due to the additional bending stresses on the whiskers. In the alumina/SiC_w system, the mode of fracture remains invariant with temperature because of high whisker compressive stresses. These observations indicate that for randomly-oriented whiskers substantial toughening by pull-out is contingent upon low interfacial stresses coupled with high strength whiskers which can sustain large bending stresses.

Item Type:Book Section
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Faber, K. T.0000-0001-6585-2536
Additional Information:© 1987 Plenum Press. The work of M. C. Shaw was supported by the LTV Aerospace and Defense Company. K. T. Faber is supported by the National Science Foundation under DMR-8351476.
Funding AgencyGrant Number
LTV Aerospace and Defense CompanyUNSPECIFIED
Series Name:Materials Science Research
Issue or Number:21
Record Number:CaltechAUTHORS:20140916-125902002
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49747
Deposited By: George Porter
Deposited On:16 Sep 2014 22:50
Last Modified:10 Nov 2021 18:47

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