(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 有色金属先进结构材料与制造协同创新中心，长沙 410083；
3. 烟台南山学院 工学院，烟台 265713)
摘 要: 采用正交试验及其方差分析、最小显著差数(LSD)法研究新型Al-Cu-Li-Ag-Mg-Zr-Ce合金的固溶和时效热处理工艺，并采用电导率、SEM、EDX、TEM等测试手段对合金热处理过程中组织结构和性能进行分析。结果表明：该合金在固溶(520 ℃，1.5 h，水冷)和时效(180 ℃，18 h，空冷)处理后，T6态显微硬度比轧制态的提高100.8%，T87态强度值达到623 MPa。固溶过程中，大量Ce、Cu、Mg、Zr溶于基体起到固溶强化作用；时效时细小片状强化相T1和薄盘状θ′相均匀弥散在基体中析出，具有强烈沉淀强化效果。
关键字: Al-Cu-Li合金；热处理；正交实验；力学性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation
Center Central South University, Changsha 410083, China;
3. School of Engineering, Yantai Nanshan University, Yantai 265713, China）
Abstract:Solid solution and aging treatment of novel Al-Cu-Li-Ag-Mg-Zr-Ce alloy was investigated by orthogonal experiment variance analysis and least significant difference (LSD) methods. Meanwhile, the microstructure characteristics and mechanical properties were explored by electrical conductivity (EC) test, scanning electron microscopy (SEM), energy dispersive X-ray spectrum (EDX) and transition electron microscopy (TEM). The results show that the micro-hardness of alloy under T6 condition are improved by 100.8% compared to that of rolling one, and the strength for alloy under T87 condition also reaches to 623 MPa after solid solution (520 ℃, 1.5 h, water quenched) and aging treatment (180 ℃, 18 h, air quenched). During solid solution, a lager amount of Ce、Cu、Mg and Zr atoms dissolve into the matrix, resulting in a strong solid solution strengthening. During the aging treatment, many fine needle-shaped T1 phase and plate-shaped θ′ phase precipitate in the matrix uniformly and dispersively, leading to an enormous precipitation strengthening.
Key words: Al-Cu-Li alloy; heat treatment; orthogonal experiment; mechanical property
