Abstract

In this study, the high-temperature transformation in a thin foil of non-stoichiometric Heusler alloy based on Ni-Mn-In is investigated using in-situ TEM. The highly ordered cubic L21 phase undergoes decomposition upon heating, forming a phase with a composition close to Ni75Mn25, which is identified as disordered FCC-Ni3Mn and secondary phases, mainly manganese oxides and sulfides. All phases formed upon heating to a temperature of 1173 K are preserved during the in-situ cooling experiment to a temperature of 123 K.

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