Abstract
The hysteresis narrowing and magnetocaloric effect (MCE) were studied in the Ni–Mn–Ga alloys. Ni 54Mn 24Ga 22 and Ni 51.9Mn 27Ga 21.1 were selected in order to obtain specific characteristic temperatures of alloys and to study an influence of several factors on the hysteresis width ( δ) of basic austenite–martensite (AM) transformation. The effect of martensite crystal lattice softening due to intermartensitic transition (IT) taking place immediately after AM transformation on δ was examined in alloy 1. MCE was measured in alloy 2, in which Curie temperature ( T C ) and austenitic start temperature ( A S) coincides. It was demonstrated that the hysteresis width δ reaches about 2 K, if IT is enough close to AM transition. MCE was found to have a maximum at T C≈ A S.
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