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| High magnetic field treatment on variants and magnetostrain in ferromagnetic shape memory alloy Ni50Mn28.5Ga21.5 single crystal |
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Cite this article:
. High magnetic field treatment on variants and magnetostrain in ferromagnetic shape memory alloy Ni50Mn28.5Ga21.5 single crystal. Acta Metall Sin, 2008, 44(3): 302-306 .
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Abstract The giant magnetostrain of NiMnGa alloys have been gained only in the single crystals with a single variant structure. Uniaxial compression treatments were used generally to get the single variant. But the method could not treat the samples with large length-diameter radios by reason of causing bend deformation. In this paper, high magnetic field treatment on the NiMnGa single crystals to gain a single variant is reported. Ni50Mn28.5Ga21.5 single crystal with size of Ф7×38.9 mm was prepared by optical floating zone-melting method. The single crystal was magnetized repeatedly in a 10T pulsed magnetic field for martensite variants treatment, and a near single variant with 5.2% giant magnetostrain was obtained. The pressure effect on the magnetostrain was investigated, and the results showed that with the compression stress increasing, the critical magnetic field for the magnetostrain jump was increased and the saturated magnetostrain was decreased.
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Received: 27 August 2007
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