Al-Si-Cu 합금의 응고 거동에 미치는 기계적 진동의 영향

Abstract

The purpose of this study is to investigate the effect of mechanical vibration on the solidification behavior of ternary Al-Si-Cu alloys using a step-wise mold. Cu is added to the binary Al-Si alloy to improve mechanical strength and workability and it is widely used for die casting. We investigated the effect of mechanical vibration on the relationship between cooling curve and secondary dendrite arm spacing (SDAS) by adding 0∼2% of Cu into Al-8wt%Si alloy. The α-dendrites were destroyed by mechanical vibration, changing into equiaxed grains. The coarsening constant for SDAS growth was decreased with Cu content when no mechanical vibration was applied, while it was rather constant when the mechanical vibration was imposed. When the mechanical vibration was applied, SDAS was similar to that of the specimen cast without the mechanical vibration, and the coarsening constant for the SDAS growth increased slightly.