Abstract
The tensile properties of hot extruded powders of Ni-24.1Al, Ni-19.1Al-8.5Cr, and Ni-17.4Al-7.9Cr-0.5Zr have been evaluated from room temperature to 1000° C. These powder metallurgy materials have a fine grain size that results in relatively little increase in yield stress with increasing temperature compared to coarse-grained or single-crystal materials. The alloy containing chromium and zirconium shows greatly reduced dynamic embrittlement in the temperature range 600 to 800° C where the unalloyed aluminide exhibits brittle behaviour. The Cr- and Cr + Zr-containing alloys deform superplastically above 900° C. The mechanism of superplastic deformation appears to be predominantly grain-boundary sliding.
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Wright, R.N., Sikka, V.K. Elevated temperature tensile properties of powder metallurgy Ni3Al alloyed with chromium and zirconium. J Mater Sci 23, 4315–4318 (1988). https://doi.org/10.1007/BF00551925
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DOI: https://doi.org/10.1007/BF00551925