Interplay between temperature and composition effects on the martensitic transformation in Ni(2+x)Mn(1-x)Ga alloys

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	Interplay between temperature and composition effects on the martensitic transformation in Ni(2+x)Mn(1-x)Ga alloys
	C. M. Li; Q. M. Hu; R. Yang; B. Johansson; L. Vitos
	2011
发表期刊	Applied Physics Letters
ISSN	0003-6951
卷号	98 期号:26
摘要	Martensitic transformation in Ni(2+x)Mn(1-x)Ga alloys is known to be controlled by the soft tetragonal elastic constant C' of the high-temperature austenitic phase. The temperature (T) and composition (x) dependence of C'(T, x) are calculated using the first-principles exact muffin-tin orbitals method. We show that the temperature factor of C' is dominated by the phonon-smearing term. The competition between the negative alloying effect (partial derivative C'/partial derivative x < 0) and the positive temperature effect (partial derivative C'/partial derivative T > 0) is found to lead to nearly constant C'(T(M)(x), x) at the critical temperature TM(x). We demonstrate that a proper account of the temperature and composition dependence of C'(T, x) is indispensable for reasonable theoretical TM(x) values. VC 2011 American Institute of Physics. [doi: 10.1063/1.3603935]
部门归属	[li, chun-mei; hu, qing-miao; yang, rui] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [li, chun-mei; johansson, borje; vitos, levente] royal inst technol, dept mat sci & engn, se-10044 stockholm, sweden. [johansson, borje; vitos, levente] uppsala univ, dept phys, condensed matter theory grp, se-75120 uppsala, sweden. [johansson, borje] dalian univ technol, sch phys & optoelect technol, dalian 116024, peoples r china. [johansson, borje] dalian univ technol, coll adv sci & technol, dalian 116024, peoples r china. [vitos, levente] res inst solid state phys & opt, h-1525 budapest, hungary.;hu, qm (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china;qmhu@imr.ac.cn
关键词	Phase
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30452
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. M. Li,Q. M. Hu,R. Yang,et al. Interplay between temperature and composition effects on the martensitic transformation in Ni(2+x)Mn(1-x)Ga alloys[J]. Applied Physics Letters,2011,98(26).
APA	C. M. Li,Q. M. Hu,R. Yang,B. Johansson,&L. Vitos.(2011).Interplay between temperature and composition effects on the martensitic transformation in Ni(2+x)Mn(1-x)Ga alloys.Applied Physics Letters,98(26).
MLA	C. M. Li,et al."Interplay between temperature and composition effects on the martensitic transformation in Ni(2+x)Mn(1-x)Ga alloys".Applied Physics Letters 98.26(2011).