Effects of Heat Treatment on Microstructure and Properties of Al-Cu-Mg Alloy
Al-4.3Cu-0.8Mg alloy was heat treated by different treatment process.The hardness and impact toughness of Al-Cu-Mg alloy were studied through observing the microstructure,detecting the mechanical properties and analyzing the fractography.The results show that solution treatment and aging treatment can refine the microstructure of the alloy and improve the hardness and toughness.After solution treatment at 525 ℃ for 8 h,and aging at 190 ℃ for 10 h,the hardness of the Al-4.3Cu-0.8Mg alloy is highest;After solution treatment at 505 ℃ for 6 h,and aging at 180 ℃for 8 h,the impact toughness of the alloy is best.