Understanding for controlling microstructure formation related to two-phase separation based on the same frame of ordered structures

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Intermetallic compounds which have ordered crystal structures are used for applications such as strengthening phases of heat resistant alloys for jet engines and gas turbines, and thermoelectric materials which can directly convert the waste heat into electrical power. We focused on two pairs of intermetallic compounds which have falsely similar ordered structures and are separated as two different phases. Morphology of microstructure of Half-Heusler type TiNiSn, an excellent thermoelectric material, was analyzed especially focusing on interfaces formed by phase separation between Half-Heusler and Heusler pahse. Effects of resemblance and difference in ordered structures between L12 and E21 types on mechanical properties were examined for Ni3 Al with solute carbon atoms.