The effect of Si content on the martensitic transfor-mation temperature of Ni55.5e18Ga26.5–xSix alloys

doi:10.1088/1674-1056/20/4/046102

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 Ni$_{55.5}$Fe$_{18}$Ga$_{26.5 - x}$Si$_{x}$ 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 Ni$_{55.5}$Fe$_{18}$Ga$_{26.5 - x}$Si$_{x}$ alloys decrease almost linearly with increasing Si content in the Si content range of $x \le 3$. Thermal treatment also plays an important role on martensitic transformation temperatures in the Ni--Fe--Ga--Si alloy. The valence electronic concentrations, size factor, L2$_{1}$ 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.

Keywords: Ni–Fe–Ga alloys ferromagnetic shape memory alloys martensitic transformation thermal treatment

Received: 18 June 2010
Revised: 22 November 2010
Accepted manuscript online:

PACS:	61.66.Dk	(Alloys )
	81.30.Kf	(Martensitic transformations)
	75.10.-b	(General theory and models of magnetic ordering)
	81.40.Ef	(Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10976007), the Fundamental Research Funds for the Central Universities (Grant Nos. ZYGX2009J046 and ZYGX2009X007) and Royal Academy of Engineering-Research Exchanges with China and India Awards in UK.

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Shen Hua-Hai(申华海), Yu Hua-Jun(余华军), Fu Hao(付浩), Guo Yuan-Jun(郭袁俊), Fu Yong-Qing(傅永庆), and Zu Xiao-Tao(祖小涛) The effect of Si content on the martensitic transfor-mation temperature of Ni_55.5e₁₈Ga_26.5–xSi_x alloys 2011 Chin. Phys. B 20 046102

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The effect of Si content on the martensitic transfor-mation temperature of Ni55.5e18Ga26.5–xSix alloys

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The effect of Si content on the martensitic transfor-mation temperature of Ni_55.5e₁₈Ga_26.5–xSi_x alloys