DETERMINATION OF CRYSTAL STRUCTURE AND CRYSTALLOGRAPHIC CHARACTERISTICS IN Ni-Mn-Ga FERROMAGNETIC SHAPE MEMORY ALLOYS

被引：0
|
作者：
Cong, D. Y. [1 ,2 ]
Zhang, Y. D. [1 ,2 ]
Esling, C. [2 ]
Wang, Y. D. [1 ]
Zhao, X. [1 ]
Zuo, L. [1 ]
机构：
[1] Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110004, Peoples R China
[2] Univ Metz, LETAM, CNRS, UMR 7078, F-57045 Metz, France
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2009年 / 23卷 / 6-7期
关键词：
Ferromagnetic shape memory alloys (FSMAs); crystal structure; misorientation; neutron diffraction; electron backscattered diffraction (EBSD); HIGH MAGNETIC-FIELD; INDIRECT 2-TRACE METHOD; MEDIUM-CARBON STEEL; PHASE-TRANSFORMATION; NEUTRON-DIFFRACTION; TEXTURES; FERRITE;
D O I：
10.1142/S0217979209061603
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Ni-Mn-Ga ferromagnetic shape memory alloys (FSMAs) have received great attention during the past decade due to their giant magnetic shape memory effect and fast dynamic response. The crystal structure and crystallographic features of two Ni-Mn-Ga alloys were precisely determined in this study. Neutron diffraction measurements show that Ni(48)Mn(30)Ga(22) has a Heusler austenitic structure at room temperature; its crystal structure changes into a seven-layered martensitic structure when cooled to 243K. Ni(53)Mn(25)Ga(22) has an I4/mmm martensitic structure at room temperature. Electron backscattered diffraction (EBSD) analyses reveal that there are only two martensitic variants with a misorientation of similar to 82 degrees around (110) axis in each initial austenite grain in Ni(53)Mn(25)Ga(22). The investigation on crystal structure and crystallographic features will shed light on the development of high-performance FSMAs with optimal properties.
引用
收藏
页码：1771 / 1776
页数：6
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