Toward Realization of Bulk L10-FeNi

Abstract

In this letter, we demonstrate for the first time the preparation of bulk L10-FeNi embedded in an fcc FeNi by alloying Fe and Ni during casting with 5%–10% indium metal and annealing at 350 °C for a week. From X-ray diffraction, magnetization, and Mössbauer data, we have strong indications that the L10-FeNi phase is formed and coexists with the cubic A1-FeNi at a ratio of 30/70 for the sample with 5% In and 20/80% for the sample with 10% In, as derived from X-ray diffraction. This finding is supported by the Mössbauer data, where the ratio of L10-FeNi to A1-FeNi is 48/52 and 24/76, respectively. The morphology of the alloys is sponge-like and very brittle, and the final In stoichiometry is much less than the nominal one.