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Abstract: The thermally induced γ–ɛ and γ–α′ martensitic transformation in Fe–30%Ni–x%Mo alloys with different Mo contents have been studied by transmission electron microscopy (TEM). Observations reveal that α′ martensite is found in alloys containing 0.8, 1.8, and 2.6% Mo, and ɛ martensite in the alloy containing 5%Mo. The first three display the Kurdjumov–Sachs (K–S) orientation relationship between γ and α′, while the other displays the Shoji–Nishiyama (S–N) orientation relationship between γ and ɛ. [Copyright &y& Elsevier]

Abstract: The paramagnetic–magnetically ordered transition and the effect of Mo content on the magnetic properties of martensite phase in Fe–30% Ni–x% Mo alloys have been investigated by AC susceptibility and Mössbauer spectroscopy. The results show that martensitic transformation temperature (M S) indicates the magnetic transition from paramagnetic to magnetically ordered state. Hyperfine magnetic field, isomery shift and volume fractions of phases were determined by Mössbauer spectroscopy. It is also found that volume fraction of thermally induced martensite and M S temperature decreased with the increasing Mo content. [Copyright &y& Elsevier]