Abstract
In the present investigation the effect of Fe substitution in Ti 51Ni 49 alloy has been studied. The alloys were synthesized through radio frequency induction melting. The alloy was characterized through X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Mössbauer spectroscopy and positron annihilation techniques. It was found that the Fe substitution stabilized the TiNi type cubic ( a = 2.998 Å) phase. The microstructure and presence of the oxide phase in Ti 51Ni 45Fe 4 alloy have been investigated by scanning electron microscopy. The positron annihilation measurements indicated a similar bulk electron density in both the as-cast and annealed (1000 °C for 30 h) alloys, typically like that of bulk Ti. Mössbauer spectroscopy studies of as-cast and annealed iron substituted samples showed regions in the samples where nuclear Zeeman splitting of Fe levels occurred and an oxide phase was found to be present in as cast Ti 51Ni 45Fe 4 alloy, while annealed sample indicated the presence of bcc iron phase.
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