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Ductile Phase Toughening of MoSi2: Effect of Reinforcement Morphology

Published online by Cambridge University Press:  15 February 2011

Long-Ching Chen ,
Nedhal Bahtishi ,
Richard Lederich  and
Wolé Soboyejo
Long-Ching Chen
Affiliation:
The Ohio State University, Department of Materials Science and Engineering, Columbus, OH 443210-1179
Nedhal Bahtishi
Affiliation:
The Ohio State University, Department of Materials Science and Engineering, Columbus, OH 443210-1179
Richard Lederich
Affiliation:
McDonnell Douglas Corporation, St. Louis, MO 63166-0516
Wolé Soboyejo
Affiliation:
The Ohio State University, Department of Materials Science and Engineering, Columbus, OH 443210-1179
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Abstract

The effects of ductile reinforcement morphology on the mechanical behavior of MoSi2 reinforced with 20 vol.% Nb are presented. While all the composites exhibit improved fracture toughness relative to the monolithic MoSi2, the most significant improvement is obtained in the composite with laminate reinforcement, followed by coarse fiber, fine fiber and particulate reinforcements. Bend strength measurements indicate a ductile-brittle-transition-temperature of ∼1250°C, and highlight the attractive properties of laminate reinforced composite. Preliminary studies of room temperature fatigue crack growth in particulate reinforced composites show a stable fatigue crack growth, which is not achieved in monolithic MoSi2. Possible ways of achieving a better combination of mechanical properties are also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 183
Copyright
Copyright © Materials Research Society 1994

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