Influences of composition and annealing on the martensitic transformation in Ni-Fe-Ga alloys

Huajun Yu; Yingmao Xie; Hong Shen

doi:10.1007/s11595-012-0596-y

Journal of Wuhan University of Technology Materials Science Edition ›› 2012, Vol. 27 ›› Issue (6) : 1038 -1041. DOI: 10.1007/s11595-012-0596-y

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Influences of composition and annealing on the martensitic transformation in Ni-Fe-Ga alloys

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Abstract

A series of Ni-Fe-Ga alloys near the prototype Heusler composition (X₂YZ) were prepared through arc-melting suction-casting method. The dependences of the transformation behavior on the alloy composition and annealing treatment were studied in detail by an optical microscope, X-ray diffraction, and differential scanning calorimeters methods. The experimental results show that the martensitic transformation temperatures increase almost linearly with increasing Ni content in all the NiFeGa alloys. Annealing the Ni_55.5Fe₁₈Ga_26.5 alloy at 100–500 °C for 3 h and at 300 °C for 1–10 h shifts the martensitic transformation start temperature by almost 20 °C to high temperature. The variations in the martensitic transformation temperatures in these alloys are discussed in terms of structural differences resulting from alloy composition and annealing treatment.

Keywords

ferromagnetic shape memory alloys / alloy composition / annealing / martensitic transformation

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Huajun Yu, Yingmao Xie, Hong Shen. Influences of composition and annealing on the martensitic transformation in Ni-Fe-Ga alloys. Journal of Wuhan University of Technology Materials Science Edition, 2012, 27(6): 1038-1041 DOI:10.1007/s11595-012-0596-y

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