A First-Principles Investigation of the Compositional Dependent Properties of Magnetic Shape Memory Heusler Alloys

被引：62
作者：
Siewert, Mario [1 ,2 ]
Gruner, Markus E. [1 ,2 ]
Hucht, Alfred [1 ,2 ]
Herper, Heike C. [1 ,2 ]
Dannenberg, Antje [1 ,2 ]
Chakrabarti, Aparna [3 ]
Singh, Navdeep [4 ]
Arroyave, Raymundo [4 ]
Entel, Peter [1 ,2 ]
机构：
[1] Univ Duisburg Essen, Fac Phys, D-47048 Duisburg, Germany
[2] CENIDE, D-47048 Duisburg, Germany
[3] Raja Ramanna Ctr Adv Technol, Indore 452013, Madhya Pradesh, India
[4] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA
来源：
ADVANCED ENGINEERING MATERIALS | 2012年 / 14卷 / 08期
关键词：
BRILLOUIN-ZONE INTEGRATIONS; AUGMENTED-WAVE METHOD; MN-GA ALLOYS; CO-NI-GA; PHASE-TRANSFORMATION; MARTENSITIC-TRANSFORMATION; STRUCTURAL STABILITY; NI2MNGA; AL; FIELD;
D O I：
10.1002/adem.201200063
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The interplay of structural and magnetic properties of magnetic shape memory alloys is closely related to their composition. In this study the influence of the valence electron concentration on the tetragonal transformation in Ni2Mn1?+?xZ1?-?x (Z?=?Ga, In, Sn, Sb) and Co2Ni1?+?xGa1?-?x is investigated by means of ab initio calculations. While the type of magnetic interaction is different for the two series, the trends of the total energy changes under a tetragonal transformation are very similar. We find that tetragonal structures become energetically preferred with respect to the cubic one as the valence electron concentration e/a is increased regardless of the system under consideration. In particular, the energy difference between the austenite and martensite structures increases linearly with e/a, which is in part responsible for the linear increase of the matensite transformation temperature. The substitution of nickel by platinum increases even further the transformation temperature.
引用
收藏
页码：530 / 546
页数：17
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