Abstract
Local Ni4Ti3 precipitation in non-equilibrium state was observed in Ti-riched Ni49.4Ti50.6 alloys, prepared by metal injection molding (MIM) without any solution or aging treatment. Upon investigating the underlying mechanism, the precipitation was found to have been caused by C and O impurities, which led to the formation of a Ni-riched region, which acted as a precursor for the precipitation of Ni4Ti3. The absence of liquid phase during pre-alloyed powder sintering was another reason for this phenomenon. The transformation temperature associated with the non-balanced formation of precipitation was discussed.
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