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采用喷射沉积技术制备了Al-12Zn-2.4Mg-1.1Cu合金。通过高分辨电子显微镜和硬度测试等手段,研究分析了双级时效处理对喷射沉积Al-Zn-Mg-Cu合金微观组织和力学性能的影响。结果表明:合金经120℃(14 h)时效后,硬度达到峰值,晶内主要强化相为η′亚稳相和少量的GPⅡ区,晶界析出相呈连续分布;合金经120℃(14 h)+160℃(0.5 h)、120℃(14 h)+160℃(16 h)、120℃(14 h)+160℃(24 h)双级时效后,硬度较峰时效相比,分别下降了5.92%、11.13%、15%,它们的晶内析出相依次是细小的η′相、粗大的η′相、粗大的η相,晶界析出相呈断续状分布,晶内和晶界的析出相明显长大,并且在120℃(14 h)+160℃(16 h)、120℃(14 h)+160℃(24 h)时效后,出现了晶界无沉淀析出带。通过对TEM图像的测量,可以得到η相和η′相的晶格参数分别为0.520、0.860 nm和0.490、1.402 nm;对η和η′相解卷处理,可以提高像的分辨率,然后用jems对η和η′相模拟,可以确定原子的基本位置。
Al-12Zn-2.4Mg-1.1Cu alloy was prepared by spray deposition. The effects of two-stage aging treatment on the microstructure and mechanical properties of spray-deposited Al-Zn-Mg-Cu alloy were studied by high-resolution electron microscopy and hardness testing. The results show that the hardness reaches the peak value after aging at 120 ℃ for 14 h, the main strengthening phase in the grain is η ’metastable phase and a small amount of GP Ⅱ zone. The precipitates are continuously distributed at 120 ℃ for 14 h ) + 160 ℃ (0.5 h), 120 ℃ (14 h) + 160 ℃ (16 h), 120 ℃ (14 h) + 160 ℃ (24 h) 5.92%, 11.13% and 15%, respectively. The precipitates in the crystal phase are fine η ’phase, coarse η’ phase and coarse η phase. The precipitates in the grain boundaries are in an intermittent distribution, and the intergranular and grain boundaries , And the precipitation of precipitates in the grain boundary is obvious. After precipitation at 120 ℃ (14 h) + 160 ℃ (16 h), 120 ℃ (14 h) + 160 ℃ (24 h) By measuring the TEM images, the lattice parameters of the η phase and the η ’phase are 0.520, 0.860 nm and 0.490, 1.402 nm, respectively. For the η and η’ phase unwinding processing, the resolution of the image can be increased, jems η and η ’phase simulation, you can determine the atomic basic position.