中国物理B ›› 2011, Vol. 20 ›› Issue (4): 46102-046102.doi: 10.1088/1674-1056/20/4/046102
申华海1, 付浩1, 郭袁俊1, 祖小涛1, 傅永庆2, 余华军3
Shen Hua-Hai(申华海)a),Yu Hua-Jun(余华军)b), Fu Hao(付浩)a), Guo Yuan-Jun(郭袁俊) a), Fu Yong-Qing(傅永庆)c),and Zu Xiao-Tao(祖小涛)a)†
摘要: 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.
中图分类号: (Alloys )