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NiAl formation by annealing of infiltrated aluminium-nickel precursors

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Abstract

Samples fabricated by pressure-infiltration of nickel powders with molten aluminium were heat treated at 1200 °C under vacuum or argon isostatic pressure. Reaction and diffusion in the asinfiltrated samples, which contained nickel, aluminium and varying amounts of Ni2Al3 and Al3Ni, resulted in the formation of NiAl as a principal phase with nickel and Ni3Al as minor phases. All samples exhibited macroporosity due to the formation of an interconnected transient liquid phase during heat treatment. Vacuum-annealed samples also showed extensive Kirkendall porosity in the nickel phase, which was, however, pore-free in hot isostatically pressed samples due to compaction during reaction. Concentration profiles of aluminium in these nickel regions were measured and are in good agreement with predicted values.

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  1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA

    D. C. Dunand

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  1. D. C. Dunand
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Dunand, D.C. NiAl formation by annealing of infiltrated aluminium-nickel precursors. JOURNAL OF MATERIALS SCIENCE 29, 4056–4060 (1994). https://doi.org/10.1007/BF00355969

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