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Precipitation of NiMo in a Ni-Mo base alloy

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Abstract

A study, using electron microscopy and diffraction techniques, was made to characterize a minor second phase present in a corrosion resistant Ni-Mo base alloy (Hastelloy alloy B containing 27.8 wt% Mo and less than 0.002 wt% C. The effect of second phase distribution in the microstructure on tensile properties and corrosion resistance was determined. The only second phase that could be identified by electron diffraction was found to be the intermetallic NiMo δ phase. It was found that during aging of previously solution treated material, selected grain boundary segments migrate and leave behind NiMo particles. This grain boundary reaction was found to have no detrimental effect on ductility and corrosion resistance.

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  1. High Technology Materials Division, Cabot Corporation, 46901, Kokomo, Indiana, USA

    H. M. Tawancy

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  1. H. M. Tawancy
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Tawancy, H.M. Precipitation of NiMo in a Ni-Mo base alloy. J Mater Sci 15, 2597–2604 (1980). https://doi.org/10.1007/BF00550765

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  • DOI: https://doi.org/10.1007/BF00550765

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