Three dimensional dendritic morphology and orientation transition induced by high static magnetic field in directionally solidified Al-10 wt.%Zn alloy

doi:10.1016/j.jmst.2019.03.029

Abstract

Abstract:

Effect of high static magnetic field on the dendritic morphology and growth direction in directionally solidified Al-10 wt.%Zn alloy were studied by three-dimensional (3D) X-ray micro-computed tomography, Electron Back-scattered Diffraction (EBSD) and X-ray Diffraction (XRD). The application of high static axial magnetic field (5T) during directional solidification was found to destabilize the solid/liquid interface and cause the growth direction of dendrite deviate from thermal gradient, leading to irregular solid/liquid interfacial shape and cellular to dendritic morphology transition. The thermoelectric magnetic convection (TEMC) caused by the interaction of thermoelectric effect and magnetic field was supposed to be responsible for the transition. In addition, the EBSD and XRD results confirm that the preferred growth direction of α-Al was found to transform from the traditionally expected <100> to <110>. The dendrite orientation transition (DOT) in Al-10 wt.%Zn alloy can be attributed to the effect of applied magnetic field on the anisotropy of crystal during solidification. The result indicates the potential application of high static magnetic field in altering the morphology and preferred growth direction of dendrite during directional solidification.

Key words: Al-Zn alloy, High static magnetic field, Three-dimensional dendrite morphology, Dendrite orientation transition, X-ray computed tomography

Sansan Shuai, Xin Lin, Yuanhao Dong, Long Hou, Hanlin Liao, Jiang Wang, Zhongming Ren. Three dimensional dendritic morphology and orientation transition induced by high static magnetic field in directionally solidified Al-10 wt.%Zn alloy[J]. J. Mater. Sci. Technol., 2019, 35(8): 1587-1592.

Figures/Tables 7

Fig. 1. Schematic of directional solidification apparatus under high static magnetic field.

Fig. 2. Longitudinal sections showing the solidification microstructure at the quenched liquid/solid interface of Al-10 wt.%Zn alloy solidified with and without magnetic field. (a) 0 T; (b) 5 T. (c) Schematic of thermoelectric moment and magnetic force on the cell/dendrite under a magnetic field parallel to the solidified direction (modified based on Ref. [16,24]).

Fig. 3. 3D renderings of mushy zone areas or interface shapes of directionally solidified Al-10 wt.%Zn alloy (a, d) and longitudinal sections showing the morphologies of columnar growth dendritic structure (b, e) as well as the cross-sections (c, f). (a, b, c) 0 T; (d, e, f) 5 T.

Fig. 4. Orthogonal projections showing the morphologies of dendrite in Al-Zn alloys. (a) free of magnetic field; (b) with magnetic field (B = 5 T).

Fig. 5. (a, e) SEM image of Al-10 wt.%Zn sample and (b, f) associated <001> or <101> pole figure measured in the whole scanned area showing the growth direction of the dendrite (indicated with dashed arrow in the figure) and (c, d and g, h) the corresponding EBSD orientation maps of longitudinal sections of observed in (a, e) showing the orientation selection of columnar dendrites. (a-d) without magnetic field; (e-h) with magnetic field.

Fig. 6. X-ray diffraction pattern of cross section of directionally solidified Al-10 wt.%Zn with (up) and without (down) magnetic field.

Fig. 7. Deflection of facial angle from the magnetic field (a) 0 T, (b) 5 T.

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