中国物理B ›› 2011, Vol. 20 ›› Issue (4): 46102-046102.doi: 10.1088/1674-1056/20/4/046102

• • 上一篇    下一篇

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

申华海1, 付浩1, 郭袁俊1, 祖小涛1, 傅永庆2, 余华军3   

  1. (1)Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China; (2)School of Engineering and Physical Sciences, Heriot Watt University, Edinburgh, EH14 4AS, UK; (3)The College of Physics and Electronic Information, Gannan Normal University, Ganzhou 314000, Jiangxi Province, China
  • 收稿日期:2010-06-18 修回日期:2010-11-22 出版日期:2011-04-15 发布日期:2011-04-15
  • 基金资助:
    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.

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

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)   

  1. a Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, China; b The College of Physics and Electronic Information, Gannan Normal University, Ganzhou 314000, Jiangxi Province, China; c School of Engineering and Physical Sciences, Heriot Watt University, Edinburgh, EH14 4AS, UK
  • Received:2010-06-18 Revised:2010-11-22 Online:2011-04-15 Published:2011-04-15
  • Supported by:
    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.

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.

关键词: Ni--Fe--Ga alloys, ferromagnetic shape memory alloys, martensitic transformation, thermal treatment

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.

Key words: Ni–Fe–Ga alloys, ferromagnetic shape memory alloys, martensitic transformation, thermal treatment

中图分类号:  (Alloys )

  • 61.66.Dk
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)