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Strengthening by ordered precipitates in a Ni−Ni4Mo system

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Abstract

The strength characteristics and microstructures of aged Ni−Mo alloys containing ordered (Ni4Mo) precipitates were studied as a function of aging time and temperature. It was found that 17 at. pct Mo alloy aged at 750°C produced a uniform dispersion of cuboidal β precipitates which coarsened with time producing a gradual increase in flow stress. The flow stress increment was found to vary in qualitative agreement with both order strengthening and coherency strain models. Both these models give over-estimates of the strengthening increment. A negative dependence of flow stress on temperature is attributed to coherency strain contributions.

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Authors and Affiliations

  1. Georgia Institute of Technology, 30332, Atlanta, GA

    John W. Goodrum (Research Engineer)

  2. Bell Laboratories, Atlanta, GA

    Bruce G. Lefevre (Member of Technical Staff)

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  1. John W. Goodrum
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  2. Bruce G. Lefevre
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Goodrum, J.W., Lefevre, B.G. Strengthening by ordered precipitates in a Ni−Ni4Mo system. Metall Trans A 8, 939–943 (1977). https://doi.org/10.1007/BF02661576

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  • DOI: https://doi.org/10.1007/BF02661576

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