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Influence of stresses on martensitic transformation in ferromagnetic shape memory Ni50Mn19Fe6Ga25 ribbons

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Abstract

The influence of stresses on martensitic transformation in Ni50Mn19Fe6Ga25 melt-spun ribbons was studied. X-ray diffraction examination shows that the ribbon has a pure cubic L21 phase at room temperature and that the ribbon surface exhibits [100] preferentially oriented texture, while the [110] axis is about 45° tilted from the normal of the ribbon. By calculating the d spacing at different angles with the length direction of the ribbon, the tension was observed. It was found that the direction of the stress was along [010] direction of the oriented textured grains. During cooling, there is no obvious structural transition observed in as-spun ribbons. However, when the ribbons were annealed at 900 K for 24 h, the tension along [010] direction disappeared and the structural transition from cubic to tetragonal occurred obviously during cooling. It indicates that it is the tension along [010] direction to suppress the martensitic transformation in the as-spun ribbons.

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Correspondence to Li Yangxian.

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Meng, F., Li, Y., Liu, H. et al. Influence of stresses on martensitic transformation in ferromagnetic shape memory Ni50Mn19Fe6Ga25 ribbons. Sci. China Ser. E-Technol. Sci. 47, 710–715 (2004). https://doi.org/10.1360/03ye0575

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  • DOI: https://doi.org/10.1360/03ye0575

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