Effect of a weak transverse magnetic field on solidification structure during directional solidification
作者： X. Li , Y. Fautrelle , A. Gagnoud , D. Du , J. Wang
DOI: 10.1016/J.ACTAMAT.2013.10.050
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摘要: Abstract Six alloys were directionally solidified at low growth speeds (1–5 μm s −1 ) under a weak transverse magnetic field (⩽0.5 T). The results show that the application of significantly modified solidification structure. Indeed, it was found that, along with refinement cells/dendrites, caused deformation liquid–solid interfaces, extensive segregations (i.e., freckles and channels) in mushy zone, change zone length. Further, situ monitoring initial transient directional carried out by means synchrotron X-ray radiography. It observed dendrite fragments equiaxed grains moved approximately direction perpendicular to field. This result shows thermoelectric force (TEMF) acted on liquid or solid during TEMF investigated numerically. reveal unidirectional induced convection (TEMC) liquid. Modification structure is attributed TEMC-driven heat transfer interdendritic solute transport TEMF-driven motion fragments.
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