(北京有色金属研究总院 有色金属材料制备加工国家重点实验室，
北京 100088)
摘 要: 采用喷射成形技术制备Al10.8Zn2.8Mg1.8Cu高强铝合金， 利用力学性能测试、 高分辨透射电镜(HREM)、 选区衍射(SAED)等手段系统研究120 ℃下该合金的时效曲线和沉淀析出行为。 研究结果表明： 该合金在120 ℃时效4 h强度即可达到800 MPa以上； 16 h达到峰时效状态， 强度可达820 MPa， 此阶段GPⅠ区和GPⅡ区联合强化起主导作用； 44 h后存在长时间的时效平台， 强度在800 MPa左右， 此阶段η′相和η相起主导强化作用。
关键字: Al-Zn-Mg-Cu合金; 喷射成形; 沉淀析出; 力学性能
（State Key Laboratory for Fabrication and Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract: Al10.8Zn2.8Mg1.8Cu alloy was prepared by spray forming technology. The microstructural evolution and the age-hardening characteristic of spray-formed Al10.8Zn2.8Mg1.8Cu alloy were studied by high resolution transmission electron microscopy (HREM) and selected area electron diffraction (SAED). The results show that the peak ultimate tensile strength (UTS) can get up to 822 MPa at 120 ℃, and the corresponding time to reach this peak strength is 16 h, the microstructure of this stage contains predominantly the spherical GPⅠ zones and sheet GPⅡ zones. The UTS will decrease after peak aging treatment and then keep little change for a relative long time. After 44 h, the microstructure of this stage contains predominantly the η′ phase and the η phase.
Key words: Al-Zn-Mg-Cu alloy; spray forming; precipitate; mechanical property
