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

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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.

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Authors and Affiliations

  1. Materials Section, Department of Mechanical and Aerospace Engineering, University of California-Irvine, Irvine, California, 92717-3975, USA

    Don Baskin, Jeff Wolfenstine & Enrique J. Lavernia

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  1. Don Baskin
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  3. Enrique J. Lavernia
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Baskin, D., Wolfenstine, J. & Lavernia, E.J. Elevated temperature mechanical behavior of CoSi and particulate reinforced CoSi produced by spray atomization and co-deposition. Journal of Materials Research 9, 362–371 (1994). https://doi.org/10.1557/JMR.1994.0362

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