The effect of Si content on the martensitic transformation temperature of Ni55.5Fe18Ga26.5-xSix alloys

Hua H. Shen, Hua J. Yu, Hao Fu, Yuan J. Guo, Yong Qing Fu, Xiao T. Zu

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Abstract

This paper investigates the effects of substitution of Si for Ga on the martensitic transformation behaviours in Ni-Fe-Ga alloys by using optical metallographic microscope and differential scanning calorimetry (DSC) methods. The structure type of Ni55.5Fe18Ga26.5-xSi x alloys is determined by x-ray diffraction (XRD), and the XRD patterns show the microstructure of Ni - Fe - Ga - Si alloys transformed from body-centred tetragonal martensite (with Si content x = 0) to body-centred cubic austenite (with x = 2) at room temperature. The martensitic transformation temperatures of the Ni55.5Fe18Ga26.5-xSi x alloys decrease almost linearly with increasing Si content in the Si content range of x = 3. Thermal treatment also plays an important role on martensitic transformation temperatures in the Ni-Fe-Ga-Si alloy. The valence electronic concentrations, size factor, L21 degree of order and strength of parent phase influence the martensitic transformation temperatures of the Ni-Fe-Ga-Si alloys. An understanding of the relationship between martensitic transformation temperatures and Si content will be significant for designing an appropriate Ni-Fe-Ga-Si alloy for a specific application at a given temperature. © 2011 Chinese Physical Society and IOP Publishing Ltd.

Original languageEnglish
Article number046102
JournalChinese Physics B
Volume20
Issue number4
DOIs
Publication statusPublished - Apr 2011

Keywords

  • ferromagnetic shape memory alloys
  • martensitic transformation
  • Ni-Fe-Ga alloys
  • thermal treatment

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