Abstract
The stability of the martensitic transformation in Ni.35at% Al was investigated as a function of processing and heat treatment conditions. Material was produced by HIPing or sintering of as-received, attritor milled or ball-milled powder. A reversible martensitic transformation is obtained in mechanically milled and consolidated Ni-35at% Al. Whereas Ni 5 Al 3 suppresses the martensitic transformationin the material made from as-received powder, the Ni 5 Al 3 transformation from the L1 0 martensite itself is retarded by the formation of Ni 2 Al in the mechanically milled material. This could be explained by the fine grain size and microstructural disorder. The activation energy for short range order is lowered, thereby facilitating the formation of Ni 2 Al and the martensitic transformation. The present results are promising for the further development of NiAl and its alloys as high temperature shape memory alloys.
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