Martensitic transformation and magnetism in Ni and Fe-rich compositions of Ni-Fe-Ga shape memory alloys

被引：7
|
作者：
Chabungbam, Satyananda [1 ]
Borgohain, Parijat [1 ]
Ghosh, Subhradip [2 ]
Singh, Navdeep [3 ]
Sahariah, Munima B. [1 ]
机构：
[1] Inst Adv Study Sci & Technol, Gauhati 781035, India
[2] Indian Inst Technol, Dept Phys, Gauhati 781039, India
[3] Univ Houston, Dept Engn Technol, Houston, TX 77204 USA
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 689卷
关键词：
Ab-initio calculations; Magnetic shape memory alloys; Martensite transformation; Curie temperature; TOTAL-ENERGY CALCULATIONS; EXCHANGE INTERACTIONS; HEUSLER; NI2FEGA; PSEUDOPOTENTIALS; MICROSTRUCTURE; SUBSTITUTION; METALS;
D O I：
10.1016/j.jallcom.2016.07.211
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
First principles spin polarized calculations have been performed to study the martensitic transformation and magnetism in stoichiometric and off-stoichiometric compositions of Ni-Fe-Ga shape memory alloys. The energy difference between cubic phase and non-modulated tetragonal phase has been estimated. The calculated shear elastic constants are found to have correlations with the valence electron concentration per atom (e/a value). From the analyses on local magnetic moments, it is observed that direct and indirect magnetic exchange occur in these alloys. The Curie temperatures estimated from the exchange parameters are found to be sensitive to the change in alloy composition. (C) 2016 Elsevier B. V. All rights reserved.
引用
收藏
页码：199 / 207
页数：9
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