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Chin J Mater Res  2004, Vol. 18 Issue (2): 123-129    DOI:
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Temperature dependence of the magnetic-field-induced strain in Ni50.5Mn26.5Ga23 single crystal
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重庆大学数理学院应用物理系
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. Temperature dependence of the magnetic-field-induced strain in Ni50.5Mn26.5Ga23 single crystal. Chin J Mater Res, 2004, 18(2): 123-129.

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Abstract  By measuring the magnetic--field--induced strain (MFIS) and the transformation strain with a field bias applied in different direction, the temperature dependence of MFIS and the field--controlled shape memory effect in the Ni50.5Mn26.5Ga23 single crystal were investigated. It was found that with decreasing temperature at the martensite phase, the saturated MFIS first decreases rapidly and then the decreasing rate becomes smaller and smaller, reflecting the temperature dependence of the MFIS in the Ni$_{2}$MnGa system. Moreover, it was also found that the decreasing rate of the saturated MFIS with decreasing temperature is different with a pulse field applied in different direction. The results are discussed with reference to the shape memory characteristics of the alloy and the mechanism of the preferentially orientation of martensitic variants.
Key words:  metallic materials      temperature dependence      strain      shape memory effect      
Received:  21 May 2004     
ZTFLH:  TG139  
  TG146  
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