The way composition affects martensitic transformation temperatures of Ni–Mn–Ga Heusler alloys

A systematic substitution of Ge, Si, C and Co for Ga in the non‐stoichiometric Ni–Mn–Ga alloys was performed. The relationship between the compositions of different elements including Ni, Mn, Ga, Ge, Si, C, Co, In and martensitic transformation temperature (Ms) was studied in detail for the present alloys together with data collected from a variety of sources. It is found that Ms is a sensitive parameter to the composition. The size factor and electron concentration are usually thought to be the way the composition influences Ms in the Ni–Mn–Ga alloys. Here, analyzing by linear regression, the electron density maybe a most appropriate parameter to describe the way the composition influences Ms when compared with size factor and electron concentration. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

[1]  敖玲,et al.  内应力对铁磁性形状记忆合金Ni-Mn-Ga马氏体相变路径的影响 , 2005 .

[2]  V. Lindroos,et al.  On the corrosion of non-stoichiometric martensitic Ni-Mn-Ga alloys , 2003 .

[3]  V. Lindroos,et al.  Crystal structure of three Ni-Mn-Ga alloys in powder and bulk materials , 2003 .

[4]  S. T. Yang,et al.  Effect of composition on transformation temperatures of Ni–Mn–Ga shape memory alloys , 2003 .

[5]  S. Gong,et al.  Effect of Ni excess on phase transformation temperatures of NiMnGa alloys , 2003 .

[6]  Huibin Xu,et al.  Magnetic and structural transition of Ni50+xMn25−x/2Ga25−x/2 (x=2–5) alloys , 2002 .

[7]  Samuel M. Allen,et al.  Empirical mapping of Ni–Mn–Ga properties with composition and valence electron concentration , 2002 .

[8]  K. Ullakko,et al.  Structure and Magnetic Properties of a Shape-Memory NiMnGa Alloy , 2002 .

[9]  W. Wang,et al.  Magnetic properties and shape memory of Fe-doped Ni52Mn24Ga24 single crystals , 2002 .

[10]  Alexei Sozinov,et al.  Magnetic-field-induced strains in polycrystalline Ni-Mn-Ga at room temperature , 2001 .

[11]  Samuel M. Allen,et al.  6% magnetic-field-induced strain by twin-boundary motion in ferromagnetic Ni–Mn–Ga , 2000 .

[12]  K. Ullakko,et al.  Isomagnetic martensitic transformation in Ni2MnGa alloys , 2000 .

[13]  G. Alexandrakis,et al.  Magnetic and transport properties of the alloys , 1999 .

[14]  T. Takagi,et al.  Effect of Grinding Stress on the Phase Transformation of Ni2+xMn1−xGa Powder , 1999 .

[15]  V. Chernenko.  Compositional instability of β-phase in Ni-Mn-Ga alloys , 1999 .

[16]  Samuel M. Allen,et al.  Field-induced strain under load in Ni–Mn–Ga magnetic shape memory materials , 1998 .

[17]  J. Coey,et al.  Structural and magnetic properties of Ni2MnGa , 1997 .

[18]  V. Martynov.  X-Ray Diffraction Study of Thermally and Stress-Induced Phase Transformations in Single Crystalline Ni-Mn-Ga Alloys , 1995 .

[19]  V. V. Kokorin,et al.  The development of new ferromagnetic shape memory alloys in Ni-Mn-Ga system , 1995 .

[20]  J. Smit.  Magnetism in Hume-Rothery alloys , 1978 .

[21]  W. Cai,et al.  Effect of Fe addition on transformation temperatures and hardness of NiMnGa magnetic shape memory alloys , 2005 .

[22]  T. Takagi,et al.  Structural and magnetic phase transitions in shape-memory alloys Ni 2+x Mn 1-x Ga , 1999 .