Investigations of the temperature dependence of magnetization revealed that, in the ferromagnetic shape memory Ni 2.14 Mn 0.81 Fe 0.05 Ga alloy, after formation of the nanocrystalline state by a severe plastic deformation method, neither ferromagnetic ordering nor a structural transition takes place. Subsequent annealing leads to the restoration of magnetic ordering. Also, on increasing the temperature of annealing restoration of the structural transition for the first time was observed. It was shown that the temperature of the thermoelastic martensitic transition depends on crystallite sizes. An intermartensitic transition in coarse grained Ni 2.14 Mn 0.81 Fe 0.05 Ga alloy was discovered.
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Imashev et al. (2005) studied this question.
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