Microstructural Characteristics of Mg2Si/Al Composite under Different Superheat and Electromagnetic Stirring

作者：Wu Xiaofeng^*; Zhang Guang'an; Wu Fufa

来源：Rare Metal Materials and Engineering, 2015, 44(3): 576-580.

DOI：10.1016/s1875-5372(15)30042-4

• Al/Mg2Si composites
• electromagnetic stirring
• superheat
• microstructural characteristics

A hypoeutectic Al-Si matrix composite reinforced by 5wt% Mg2Si was prepared under different superheats and electromagnetic stirring (EMS), and the effects of pouring temperature (superheat) and EMS on the morphology and the grain size distribution of primary alpha-Al, (alpha-Al+Mg2Si) eutectic cell and eutectic Mg2Si were investigated. The results show that the low superheat + EMS process refines the grain structure of the primary alpha-Al and (alpha-Al+Mg2Si) eutectic cell, promotes the formation of more non-dendritic structure of the phases, as well as refines the eutectic Mg2Si and changes the nucleation mode of (alpha-Al+Mg2Si) binary eutectic from the nucleation on primary alpha-Al under conventional casting to the one on nucleant particles in the interdendritic liquid under low superheat + EMS.

• 出版日期2015-3
• 单位辽宁工业大学