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

被引：19

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

页码：54 / 61

页数：8

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