Effects of thermoelectric-magneto convection on the solidified microstructures of Al-4.5% Cu alloy

• 来源期刊: 煤炭学报（英文版）
• 年，卷（期）: 2004,（2）
• 页码范围: 89-91
• 页数: 3页
• 语种: 英文

摘要

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.