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

Shen, Hua-Hai, Yu, Hua-Jun, Fu, Hao, Guo, Yuanjun, Fu, Yong Qing and Zu, Xiao-Tao (2011) The effect of Si content on the martensitic transformation temperature of Ni55.5Fe18Ga26.5−xSix alloys. Chinese Physics B, 20 (4). 046102. ISSN 1674-1056

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Official URL: http://dx.doi.org/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 Ni55.5Fe18Ga26.5−xSix 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−xSix 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.

Item Type: Article
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 23 Mar 2015 11:15
Last Modified: 24 Oct 2017 08:53
URI: http://nrl.northumbria.ac.uk/id/eprint/21682

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