DETERMINATION OF CRYSTAL STRUCTURE AND CRYSTALLOGRAPHIC CHARACTERISTICS IN Ni-Mn-Ga FERROMAGNETIC SHAPE MEMORY ALLOYS
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 Ni48Mn30Ga22 has a Heusler austenitic structure at room temperature; its crystal structure changes into a seven-layered martensitic structure when cooled to 243K. Ni53Mn25Ga22 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 ～82° around <110> axis in each initial austenite grain in Ni53Mn25Ga22. The investigation on crystal structure and crystallographic features will shed light on the development of high-performance FSMAs with optimal properties.
Ferromagnetic shape memory alloys (FSMAs) crystal structure misorientation neutron diffraction electron backscattered diffraction (EBSD)
D.Y.CONG Y.D.ZHANG C.ESLING Y.D.WANG X.ZHAO L.ZUO
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern Univers Laboratoire dEtude des Textures et Application aux Matfriaux (LETAM), CNRS-UMR 7078, University of Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern Univers
国际会议
第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)
哈尔滨
英文
1771-1776
2008-09-03（万方平台首次上网日期，不代表论文的发表时间）