Evolution of microstructure and microsegregation in Ni-Mn-Ga alloys directionally solidified under axial magnetic field

被引：20
作者：
Hou, Long [1 ]
Dai, Yanchao [1 ]
Fautrelle, Yves [2 ]
Li, Zongbin [3 ]
Ren, Zhongming [1 ]
Esling, Claude [4 ]
Li, Xi [1 ,2 ]
机构：
[1] Shanghai Univ, State Key Lab Adv Special Steels, Shanghai 200072, Peoples R China
[2] ENSHMG, EPM Madylam, BP 38402, St Martin Dheres, France
[3] Northeastern Univ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Liaoning, Peoples R China
[4] Univ Lorraine, CNRS UMR 7239, LEM3, F-57045 Metz, France
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 758卷
关键词：
Magnetic shape memory alloys (MSMAs); Microsegregation; Magnetic field; Directional solidification; SHAPE-MEMORY ALLOYS; SINGLE-CRYSTALS; PHASE; MARTENSITE; GROWTH;
D O I：
10.1016/j.jallcom.2018.05.136
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：
In this work, the microstructure and microsegregation in Ni-Mn-Ga alloys directionally solidified using a seedless Bridgman technique under an axial magnetic field are investigated. The experimental results indicate that the magnetic field refines cells/dendrites and reduces microsegregation. A numerical simulation is performed to investigate convection during directional solidification under an axial magnetic field. Thermoelectric magnetic convection at the cell/dendrite scale is found to be primarily responsible for the refinement of cells/dendrites and for the inter-cellular/dendritic composition homogeneity under a magnetic field. This finding is of significance as it highlights the role of magnetic field on the microsegregation during directional solidification, which could be used in future as a tool for controlled microstructure growth. (C) 2018 Published by Elsevier B.V.
引用
收藏
页码：54 / 61
页数：8
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