期刊
IEEE TRANSACTIONS ON MAGNETICS
卷 36, 期 5, 页码 3266-3268出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/20.908764
关键词
magnetic shape memory; magnetoelastic deformation; martensitic transformation; NiMnGa alloys
A room temperature extensional strain of 5.1% was observed in martensitic Ni48Mn31Ga21 alloy in the magnetic field of 480 kA/m. The magnitude of field-induced strain decreases with increasing external compressive stress applied in the direction of expansion, The compressive stress of about 3 MPa prevents the development of the substantial field-induced strain. Magnetization curves obtained by VSM exhibit an abrupt magnetization change and a transient hysteresis in the first quadrant. Large reversible field-induced strain and the abrupt magnetization change are due to the rearrangement or redistribution of martensitic twin variants by the applied magnetic field, It was confirmed by optical observation of movement and nucleation of martensitic twin boundaries.
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