Coarsening-Resistance of a Severely Deformed AI-0.2 Wt Sc Alloy

摘要

Second-phase Al_3Sc particles play an important role in several aspects of material performance. These include increasing strength, stabilizing microstructure and increasing recrystallization temperature and thermal stability. The present work was conducted to investigate the stability of Al_3Sc particles in a severely deformed Al-0.25 wt% Sc alloy at room temperature in comparison to that of Al_2Cu precipitates in an Al-Cu alloy. Microstructural examination and hardness tests showed that the Al_3Sc particles were coarsening resistant with substantially higher stability than Al_2Cu and the hardness of the Al-0.25Sc alloy remained almost constant while an apparent hardness drop was observed for the Al-Cu alloy.