Neutron diffraction study on crystal structure and phase transformation in Ni-Mn-Ga ferromagnetic shape memory alloys

被引：5

作者：

Cong, D. Y. ^{[1
]}

Wang, Y. D. ^{[1
]}

Xu, J. Z. ^{[1
]}

Zuo, L. ^{[1
]}

Zetterstroem, P. ^{[2
]}

Delaplane, R. ^{[3
]}

机构：

[1] Northeastern Univ, Key Lab Anisotropy & Texture Mat MOE, Shenyang 110004, Peoples R China

[2] Stockholm Univ, Dept Struct Chem, S-10691 Stockholm, Sweden

[3] Uppsala Univ, Studsvik neutron Res Lab NFL, S-61182 Nykoping, Sweden

来源：

POWDER DIFFRACTION | 2007年 / 22卷 / 04期

关键词：

neutron powder diffraction; ferromagnetic shape memory alloy; crystal structure; martensitic transformation; Ni-Mn-Ga alloy;

D O I：

10.1154/1.2790932

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Crystal structure and phase transformation behaviors in two Ni-Mn-Ga ferromagnetic shape memory alloys (FSMAs) with compositions of Ni48Mn30Ga22 and Ni53Mn25Ga22 (at. %) as a function of temperature were investigated by in situ neutron diffraction experiments. Neutron diffraction technique proves to be highly efficient in characterizing structural transformation in Ni-Mn-Ga FSMAs, which consist of nearby elements in the periodic table. Our neutron results show that Ni48Mn30Ga22 has a cubic, L-21 Heusler structure from 373 to 293 K. Its crystal structure changes into a seven-layered orthorhombic martensitic structure when cooled to 243 K, and no further transformation is observed upon cooling to 19 K. Neutron diffraction results also show that Ni53Mn25Ga22 has a tetragonal 14/mmm martensitic structure from 20 to 403 K. A pre-transformation around room temperature is observed from an abrupt jump in unit-cell volume of Ni53Mn25Ga22, which corresponds with an endothermic peak detected in a heated DSC curve. (C) 2007 International Centre for Diffraction Data.

引用

页码：307 / 311

页数：5

共 10 条

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