Abstract
Phase equilibria at 700 and 850°C, critical temperatures of B2/L21 order–disorder transformation and martensitic and ferromagnetic phase regions at room temperature in the Ni–Mn–In system were determined mainly by diffusion triple method using a two-stage diffusion couple technique. It was confirmed that a single phase region of the β phase at both 700 and 850°C exists in a wide composition range along the NiMn–NiIn section and that the L21 ordered phase region appears in the vicinity of Ni2MnIn in the temperature region below about 800°C. The composition lines, iso-Ms and iso-TFM, possessing the Ms and TC temperatures at room temperature, respectively, were successfully estimated and the coincidence between the iso-Ms and iso-TFM was confirmed in the composition region from 10 to 20at.% In in the β-phase region.
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