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Using the Mossbauer effect of 57Fe, the process of phase separation in Fe-Ni-Al alloys was studied with an attempt to clarify whether the separation is made by the spinodal decomposition or the nucleation and growth type decomposition. Two compositions, Fe1/2(NiAI)1,2 and Fe1/3(NiAI)2/3, were chosen. The specimens were aged for various periods of time at constant temperatures after quenching from the one-phase region, and the Mossbauer spectra were taken. The hyperfine field of 57Fe in the Fe-rich phase gradually increased with the aging time until the final value was attained, while the isomer shift of 57Fe in the paramagnetic NiAl-rich phase shifted gradually to that of -"'Fe surrounded by eight Al atoms. Spreading of the width of each ferromagnetic absorption peak indicated that the Fe-rich phase had no definite composition but a wide composition distribution. These results directly showed that the Fe-Ni-Al alloy system was decomposed by the spinodal decomposition mechanism.

A Study of Spinodal Decomposition in Fe&ndash;Ni&ndash;Al Alloys by M&ouml;ssbauer Effect

A Study of Spinodal Decomposition in Fe–Ni–Al Alloys by Mössbauer Effect