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Elevated temperature mechanical behavior of CoSi and particulate reinforced CoSi produced by spray atomization and co-deposition

Published online by Cambridge University Press:  03 March 2011

Don Baskin ,
Jeff Wolfenstine  and
Enrique J. Lavernia
Don Baskin
Affiliation:
Materials Section, Department of Mechanical and Aerospace Engineering, University of California-Irvine, Irvine, California 92717-3975
Jeff Wolfenstine
Affiliation:
Materials Section, Department of Mechanical and Aerospace Engineering, University of California-Irvine, Irvine, California 92717-3975
Enrique J. Lavernia
Affiliation:
Materials Section, Department of Mechanical and Aerospace Engineering, University of California-Irvine, Irvine, California 92717-3975
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Abstract

Monolithic CoSi and TiB2 reinforced CoSi materials were produced by spray atomization and co-deposition. The creep behavior of both materials at elevated temperature was investigated. The unreinforced material of grain size ≍25 μm exhibited a stress exponent of three, activation energy for creep of 320 kJ/mole, dislocation substructure of homogeneously distributed dislocations, and inverse creep transients upon stress increases. These results suggest that the creep behavior of CoSi is controlled by a dislocation glide mechanism. In contrast, the reinforced material of a finer grain size (≍10 μm) exhibited a stress exponent of unity, activation energy for creep of 240 kJ/mole, and negligible creep transients upon stress increases, suggesting that the creep behavior of the reinforced material is controlled by a diffusional creep mechanism. The creep resistance of the reinforced material was lower than that for the unreinforced material. This is a result of the finer grain size and higher porosity in the reinforced material.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 2 , February 1994 , pp. 362 - 371
Copyright
Copyright © Materials Research Society 1994

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