Abstract
The compressive properties of NiAl were found to be a sensitive function of Ni-content, solid solution hardening (by microalloying) and precipitate strengthening. The Ostwald ripening of the precipitates, which supposedly consist of the impurities C, B, O, N, Si, and S together with the extra getter metals Ti, Zr, and Hf or getter traces in the NiAl matrix, results in a specific yield stress decrease during aging at 573--973 K. The total amount of the intrinsic impurities in as-produced alloys has been found to be independent of stoichiometry and microalloying with a getter. Among the extra impurities studied, C was found to change the local electron density in a much more pronounced way compared to B or Si. Static strain-aging at 573 K and strain-rate sensitivity parameters at 473 K can be interpreted adequately by taking into account the less pronounced gettering in NiAl doped with Ti, and more pronounced gettering in NiAl doped with Hf and Zr.
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