Abstract
The intermetallic phase [beta] NiAl to be an alloy with high heat resistance and good oxidation resistance and is being developed as a potential material for high temperature applications. In addition, off-stoichiometric nickel rich [beta] Ni-Al compositions are known to undergo a thermoelastic martensitic transformation and exhibit shape memory effect at relatively high temperatures. There is no major difficulty in processing these alloys at elevated temperatures. However, thy suffer a major problem of brittle fracture and poor ductility at ambient temperature. In this regard it has been suggested that finer grained NiAl can exhibit enhanced ductility. Moreover, in quenched alloys containing [>=]35at.% Al there is a problem with reversibility of the martensitic transformation. This is because, martensite decomposes on heating by temperate and this suppresses subsequent transformation to martensite on cooling. The aim of this work was to investigate the possibility of producing nickel rich Ni-Al alloys by P/M route. It will also be shown that the tendency for martensite to temper is suppressed with such a method of preparation.
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