Abstract
A detailed analysis of the influence of Cu addition on the martensitic transformation and the composition dependent transitions in Ni50-xMn25Ga25Cux Heusler alloys after two types of heat treatment was carried out. The chemical modification affected the martensitic transformation temperature, which increased from 202 to 691 K upon Cu addition. The chemical modification also affects the type of martensite structure, which changed from a ten-layered through a fourteen-layered and finally to a non-modulated crystal structure. At higher Cu content of ∼9 atomic percent precipitation of a second phase occurs enriched in Cu that disturbs the monotonic increase of the martensitic transformation temperature. It was also shown that water quenching at 1173 K affects the temperature and hysteresis of the martensitic transformation, as well as the chemical composition and temperature range of the 14 M → 2 M inter-martensitic transformation. Additionally, a narrow to wide transition of the martensitic transformation hysteresis was found to be independent of the applied heat treatments.
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