(华南理工大学 机械与汽车工程学院 国家金属材料近净成形工程技术研究中心，广州 510640)
摘 要: 对喷射成形6061铝合金的热处理工艺进行研究，采用硬度测试、拉伸试验和透射电镜等研究固溶温度、时效温度和时效保温时间对合金显微组织和力学性能的影响规律。结果表明：随固溶温度的升高，合金硬度也随之升高，而其抗拉强度、屈服强度和断后伸长率则先增大后减小；合金硬度、抗拉强度和屈服强度随时效温度的升高先增大后减小，断后伸长率却一直减小；合金硬度、抗拉强度和屈服强度曲线随时效温保温时间的延长呈驼峰状变化，断后伸长率则变化不大，只在17 h时有所增大；喷射成形6061铝合金的最佳热处理工艺为530 ℃固溶1 h+175 ℃时效8 h。
关键字: 6061铝合金；喷射成形；热处理工艺；组织；性能
（National Engineering Research Center of Near-net-shape Forming Technology for Metallic Materials,
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China）
Abstract:The heat treatment of spray-formed 6061 aluminum alloy was studied. The effects of solution temperature, aging temperature and aging holding time on the microstructures and mechanical properties were investigated using hardness measurement, tensile test and TEM. The results show that with increasing the solution temperature, the hardness of alloy increases, while the tensile strength, yield strength and elongation first increase and then decrease. The hardness, tensile strength and yield strength of the alloy first increase then decrease with increasing the aging temperature, while the elongation decreases. The hardness, tensile strength and yield strength curves of the alloy are hump-like change with prolonging the aging holding time, while the elongation changes a little and increases only at 17 h. The best heat treatment process of the spray-forming 6061 aluminum alloy is as follows, solution treated at 530 ℃ for 1 h and then aging at 175 ℃ for 8 h.
Key words: 6061 aluminum alloy; spray forming; heat treatment process; microstructures; properties
