Application of electromagnetic separation of phases in alloy melt to produce in-situ surface and functionally gradient composites

作者：Xu, ZM^*; Li, TX; Zhou, YH

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2003, 34A(8): 1719-1725.

DOI：10.1007/s11661-003-0315-6

• Electromagnetic separation

The principle of electromagnetic separation of phases (primary phase) in alloy melt is that the electromagnetic force scarcely acts on the primary I phases due to its low electric conductivity as compared to the melt. As a result, a repulsive force acts on the primary iron-rich phases to push them to move in the direction opposite to that of the electromagnetic force. The in-situ surface composite and the functionally gradient composite reinforced by primary Si are produced when the hypereutectic Al-Si alloy solidifies under electromagnetic force induced by static magnetic field and DC current. Similarly, the Al-Si-1.20 pct Fe-1.60 pct Mn alloy in-situ surface composite reinforced by primary iron-rich phase is produced. Based on this, a new method for production of in-situ multigradient composite with several layers, by electromagnetic separation of phases and directional solidification technique, is proposed.

• 出版日期2003-8
• 单位上海交通大学