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Fracture and Fatigue Resistance of Ag/Ta-coated SCS-6/Ti3Al Composites

Published online by Cambridge University Press:  15 February 2011

Hsing-Pang Chiu  and
J.-M. Yang
Hsing-Pang Chiu
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles Los Angeles, CA 90024
J.-M. Yang
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles Los Angeles, CA 90024
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Abstract

The effect of a Ag/Ta coating on the fracture resistance of a notched SCS-6 fiber-reinforced Ti3Al matrix composite under both static and fatigue loading was investigated. The crack propagation patterns and damage mechanisms under various loading conditions were characterized and compared with the uncoated composite counterparts. The results show that the Ag/Ta-coated composites exhibit typical mode-I failure patterns under both static and fatigue loading, while mixed mode-I & H failure patterns were observed in the uncoated SCS-6/Ti-25-10 composite. Localized interfacial debonding, matrix cracking and fiber fracture in the crack wake were the responsible damage mechanisms for the Ag/Ta-coated SCS-6/Ti-25-10 composite. Extensive interfacial debonding, crack splitting and branching, however, were found to be the dominant mechanisms in the uncoated SCS-6/Ti-25-10 composite.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 153
Copyright
Copyright © Materials Research Society 1994

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