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Ta and Nb Reinforced MoSi2

Published online by Cambridge University Press:  21 February 2011

David H. Carter  and
Patrick L. Martin
David H. Carter
Affiliation:
Los Alamos National Laboratory, Mail Stop G770, Los Alamos, NM 87545
Patrick L. Martin
Affiliation:
Rockwell Science Center, 1049 Camino dos Rios, Thousand Oaks, CA 91360
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Abstract

MoSi2 matrix composites have been recognized lately as potential materials for structural applications at elevated temperatures. Specifically, MoSi2 composites may exhibit useful properties at temperatures to 1400°C. Previous work improved the yield strength of MoSi2 at 1400°C by a factor of five through SiC whisker reinforcement. Current research is directed towards increasing the fracture toughness of MoSi2 through the addition of ductile phase reinforcements such as niobium and tantalum. The reaction between Nb and MoSi2 to form (Mo,Nb)5 Si3 proceeds with faster kinetics at hot isostatic press temperatures as low as 1100°C when compared to the reaction between Ta and MoSi2 to form (Mo,Ta)5Si3. This reaction product exhibits very poor properties, as evidenced by crack propagation through this layer during fracture. The feasibility of hot working these composites to produce tailored microstructures is examined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 131
Copyright
Copyright © Materials Research Society 1990

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