Effects of Aging Treatment on Microstructure and Properties of Al-Zn-Mg-Cu Extruded Bar
GAO Jingjing1, LI Xujian1, FU Jianjian1, ZHOU Yubao1, MA Yong1, HUANG Qingmei2, YANG Xianwen2, YE Lingying2
1.Henan Key Laboratory of Fastening Connection Technology, Xinyang 464000, Henan, China;
2.School of Material Science and Engineering, Central South University, Changsha 410083, Hunan, China
Abstract：The effects of aging treatment on the microstructure and properties of Al-Zn-Mg-Cu extruded bars were investigated. The results show that the alloys treated by two-stage aging and re-aging (TSR), retroregression and re-aging (RRA), and non-isothermal aging (NIA), compared to the treatment with T73, all present better intergranular corrosion (IGC) resistance, with the maximum corrosion depth down from 70 μm to 19, 48, and 30 μm, respectively. Compared to those treated by RRA and NIA, the TSR-treated alloy has the similar tensile strength and yield strength, but obviously superior IGC. After the treatment of T73, TSR, RRA, and NIA, the alloy has its grain boundary precipitates with average size of 27.7, 39.2, 31.6, and 25.5 nm, respectively, and matrix precipitates with average size of 8.1, 10.2, 10.9, and 11.0 nm, respectively.
高靖靖, 李旭健, 付建建, 周玉宝, 马勇, 黄青梅, 杨献文, 叶凌英. 时效工艺对Al-Zn-Mg-Cu挤压棒材组织和性能的影响[J]. 矿冶工程, 2024, 44(1): 147-151.
GAO Jingjing, LI Xujian, FU Jianjian, ZHOU Yubao, MA Yong, HUANG Qingmei, YANG Xianwen, YE Lingying. Effects of Aging Treatment on Microstructure and Properties of Al-Zn-Mg-Cu Extruded Bar. Mining and Metallurgical Engineering, 2024, 44(1): 147-151.
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2024, Vol. 44 
