Abstract
Using the Mössbauer 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(NiAl)1⁄2 and Fe1⁄3(NiAl)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 Mössbauer 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 57Fe 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.
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