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Mechanical properties of precipitation-strengthened Ni-Al-Cr alloy based on an NiAl intermetallic compound

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Abstract

Mechanical properties of a ternary alloy Ni-30.3 at. % Al-6.6 at. % Cr have been studied in the temperature range 25 to 1100° C. The material was heat-treated to produce a stable dispersion of incoherent rod-shaped Ni3Al precipitates, 1μm in diameter and 20μm long. The tensile properties were found to be temperature dependent. Below 750° C the material had high strength, low ductility and low strain-rate sensitivity, whilst above 750° C the strength fell, ductility increased and the material became strain-rate sensitive. The room temperature fracture toughness of the single-phase material was 6 MN m−3/2 and increased to 50 MN m−3/2 in the two-phase material. This can be attributed to the effect of Ni3Al on crack nucleation and propagation.

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Author notes

  1. R. Moskovic

    Present address: CEGB, Scientific Services Department, Gravesend Laboratory, Canal Road, Gravesend

Authors and Affiliations

  1. Department of Metallurgy and Material Science, University of Cambridge, Pembroke Street, Cambridge

    R. Moskovic

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  1. R. Moskovic
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Moskovic, R. Mechanical properties of precipitation-strengthened Ni-Al-Cr alloy based on an NiAl intermetallic compound. J Mater Sci 13, 1901–1906 (1978). https://doi.org/10.1007/BF00552896

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  • DOI: https://doi.org/10.1007/BF00552896

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