【摘 要】
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A magnetic field was used to directional solidification of dendritic Al-Cu alloys.The primary arm spacing of the dendrites is increased with increasing the external magnetic field strength. This microstructural coarsening is related to the thermoelectric
【机 构】
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Department of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China
论文部分内容阅读
A magnetic field was used to directional solidification of dendritic Al-Cu alloys.The primary arm spacing of the dendrites is increased with increasing the external magnetic field strength. This microstructural coarsening is related to the thermoelectric current on the I/s interface, which is induced by difference of temperature on the interface. Within a magnetic field Lorentz force may be generated in front of the interface,causing a thermoelectric-magneto convection that makes the microstructure coarsened.This induced convection also leads to structural instability so that the secondary arms are well developed when grown in the external field.
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