Grain Size Control of Semisolid A356 Alloy Manufactured by Electromagnetic Stirring

材料科学技术（英文）, 2005, 21(2): 219-225.

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1.National Research Lab of Thixo-Rheo Forming, School of Mechanical Engineering, Pusan National University, Pusan 609-735,Korea

2.National Research Lab of Thixo-Rheo Forming, School of Mechanical Engineering, Pusan National University, Pusan 609-735,Korea

3.National Research Lab of Thixo-Rheo Forming, School of Mechanical Engineering, Pusan National University, Pusan 609-735,Korea

基金项目: This work is supported by the National Research Labora tory (NRL) Program of THIXO-RHEO Forming and Pusan National University in the Program(Post-DOC. 2004) The invaluable help of the other members of the research group is also gratefully appreciated support from the Ministry of Science ＆ Technology

Grain Size Control of Semisolid A356 Alloy Manufactured by Electromagnetic Stirring

Keywords： Semisolid metal process

To investigate the possibility of substituting the mechanical stirring system with electromagnetic stirring (EMS)system for aluminum rheo die-casting, the EMS under the different stirring cooling conditions was carried out. It was found that in the early period of solidification, the dendrite breakages led to a fine primary phase. When dendrites grew coarsely, the effect of ripening on grain size overwhelmed that of dendrite breakage. It was also found that the high cooling rate favored large nucleation rate, and led to a fine primary phase. But high cooling rate also made the growth rate of the dendrite arm, which prevented the dendrite arm from being sheared off. Therefore there were a suitable stirring time and suitable cooling rate to obtain the best rheo die-casting structure. Qualified semisolid A356aluminum alloy was successfully manufactured with short time EMS.

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Grain Size Control of Semisolid A356 Alloy Manufactured by Electromagnetic Stirring

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