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Microcracking, Strain Rate and Large Strain Deformation Effects in Molybdenum Disilicide

Published online by Cambridge University Press:  25 February 2011

D. A. Hardwick  and
P. L. Martin
D. A. Hardwick
Affiliation:
Rockwell International Science Center, 1049 Camino Dos Rios, Thousand Oaks, CA 91360
P. L. Martin
Affiliation:
Rockwell International Science Center, 1049 Camino Dos Rios, Thousand Oaks, CA 91360
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Abstract

High purity molybdenum disilicide was deformed in compression to strains ranging from 5 to >50%. The deformation was accomplished at temperatures in the range 1200°-1400°C and at strain rates from 10−3 to 10−5 sec−1. The strength of this high purity material was found to be at least twice that of MoSi2 produced by the hot pressing of commercial powder. Microstructural examination revealed that subgrain formation resulted from modest strains (≈10%) while dynamic recrystallization was observed following large strains. Transmission microscopy revealed a significant change in the dislocation substructure after straining as the temperature was increased from 1300°C to 1400°C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 209
Copyright
Copyright © Materials Research Society 1994

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