Abstract
In the present study, the fcc→fct martensitic transformation and antiferromagnetic transition of the Mn82.2Ni17.8 alloy are studied by electric resistance measurement, dynamic mechanical analyzer, and transmission electron microscopy. The magnetic-field-induced strain associated with antiferromagnetic-order twin martensitic structure of the polycrystalline antiferromagnetic alloy is investigated. In addition, the threshold field of magnetic-field-induced strain of antiferromagnetic materials and the relation of antiferromagnetic domains and martensitic twins are discussed qualitatively.
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