Evolution of microstructure and microsegregation in Ni-Mn-Ga alloys directionally solidified under axial magnetic field - Science et Ingénierie des Matériaux et Procédés Accéder directement au contenu
Article Dans Une Revue Journal of Alloys and Compounds Année : 2018

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

Résumé

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.
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Dates et versions

hal-01900913 , version 1 (22-10-2018)

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Citer

Long Hou, Yanchao Dai, Yves Fautrelle, Zongbin Li, Zhongming Ren, et al.. Evolution of microstructure and microsegregation in Ni-Mn-Ga alloys directionally solidified under axial magnetic field. Journal of Alloys and Compounds, 2018, 758, pp.54-61. ⟨10.1016/j.jallcom.2018.05.136⟩. ⟨hal-01900913⟩
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