#Effect of dendrite structure free

To the best of our knowledge, the transition of dendrite preferred growth orientation caused by magnetic field has not yet been reported.

However, these studies based on 2D metallographic or SEM are insufficient to completely elucidate the effect of magnetic field on the 3D dendritic morphology and the solid/liquid interface shape, especially the TEMC in front of the dendrite growth interface, ,, , ]. Moreover, magnetic field was also demonstrated to be able to control the growth direction of dendrite and align the columnar growth dendrites along the magnetic field. Their experimental results confirmed that thermoelectric magnetic convection (TEMC) could play an important role in affecting dendrite formation when solidified under magnetic field. suggested that the applied magnetic field would modify the dendrite morphology and solid/liquid interfacial stability during directional solidification.

Besides the alloying element, it has been proved that magnetic field can significantly affect the microstructure formation during solidification, ,, ,, ].

#Effect of dendrite structure free

These DOT phenomena were explained as either the influence of Zn on the solid/liquid interfacial free energy anisotropy which determines dendrite growth direction or the formation of twin grains or feathery grains. , a trace addition of Cr in Al-20 wt.%Zn alloy was also demonstrated to alter growth direction of α-Al to direction. Recently, as presented by Kurtuldu et al. Further, a similar DOT and morphology transition phenomenon of α-Mg dendrite was found in Mg-Zn alloys with Zn additions increased from 10 wt.% to 50 wt.%. A continuous dendrite orientation transition (DOT) from to was observed in Al-Zn alloys as the concentration of Zn( c Zn) increases from 5 wt.% to 90 wt.%, ,, , ]. However, dendrite structure formation during solidification would be tailed by many methods. As a consequence, is usually expected to be the preferential growth direction in Al alloys or cubic metals in most cases, , ]. In fcc aluminum, (111) is supposed to be the close-packed plane and directions form the axes of the pyramid. The result indicates the potential application of high static magnetic field in altering the morphology and preferred growth direction of dendrite during directional solidification.ĭendrite structure is widely existed in metallic materials during solidification and its branching arms tend to evolve along specific directions in related to the intrinsic of crystallography. 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. In addition, the EBSD and XRD results confirm that the preferred growth direction of α-Al was found to transform from the traditionally expected to. The thermoelectric magnetic convection (TEMC) caused by the interaction of thermoelectric effect and magnetic field was supposed to be responsible for the transition. 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. 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).