(1. 南昌大学 材料科学与工程学院，南昌 330031；2. 南昌大学 机电工程学院，南昌 330031)
摘 要:
关键字: 流变成形；压铸；微观组织；力学性能；热处理
（1. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China;2. School of Mechanical and Electronic Engineering, Nanchang University, Nanchang 330031, China）
Abstract:Based on the independently developed rheocasting process named as low superheat pouring with a shear field (LSPSF), a new one-step semi-solid processing technique, the rheo-diecasting (RDC) process, was exploited. The porosity in RDC YL112 secondary aluminum alloy castings, heat treatments and mechanical properties were investigated. The results show that RDC can improve the integrity and mechanical properties, particularly elongation of YL112 alloy, and the heat treatment can further enhance the mechanical properties. The spheroidization process of eutectic silicon in YL112 alloy is already finished after solution treatment at 500 ℃ for 3 min. A suitable combination of strength and ductility can be obtained under an exploited T6 heat treatment process, solution treated at 500 ℃ for 30 min followed by water quenching at 80 ℃ and then artificial aged at 160 ℃ for 6 h.
Key words: rheoforming; diecasting; microstructure; mechanical properties; heat treatment
