Effect of solution treatment on microstructure and properties of Al-8.8Zn-2.0Mg-2.1Cu-0.1Zr-0.1Ce alloy

doi:10.13251/j.issn.0254-6051.2021.06.011

Abstract

Abstract: Effects of solution treatment temperature and time on microstructure, tensile properties and fracture morphology of Al-8.8Zn-2.0Mg-2.1Cu-0.1Zr-0.1Ce alloy sheet were studied by using tensile test, conductivity test, optical micrography (OM), scanning electron microscopy (SEM), differential thermal analysis (DSC) and transmission electron microscopy (TEM). The results show that the suitable solution treatment process for the alloy is 470 ℃×60 min, which makes the intermetallic compounds in cold rolled alloy fully solved, and the tensile strength (R_m), yield strength (R_p0.2) and elongation (A) of the alloy after aging are 646 MPa, 581 MPa and 14.5%, respectively. The TEM observation shows that the intragranular strengthening phase η′ is only 2-5 nm and the grain boundary phase η distributes discontinuously after solution and aging treatment. In addition, a large number of AlCuCeZn particles dispersed in the tensile fracture dimples are beneficial to the improvement of the ductility of the alloy.

Key words: Al-Zn-Mg-Cu alloy, solution treatment, microstructure, tensile properties

CLC Number:

TG146.2

Li Caiqiong, Kong Debin, Yu Xinxiang. Effect of solution treatment on microstructure and properties of Al-8.8Zn-2.0Mg-2.1Cu-0.1Zr-0.1Ce alloy[J]. Heat Treatment of Metals, 2021, 46(6): 53-58.

References

[1]朱鹏程, 姜丽军, 向康宁, 等. Al -8.0Zn-2.0 Mg- 2.1Cu合金均匀化过程中Al₂CuMg 相的消除[J]. 金属热处理, 2020, 45(5): 40-44.
Zhu Pengcheng, Jiang Lijun, Xiang Kangning, et al. Elimination of Al₂CuMg phase during homogenization in Al-8.0Zn-2.0Mg-2.1Cu alloy[J]. Heat Treatment of Metals, 2020, 45(5): 40-44.
[2]江福清, 黄继武, 刘赟, 等. 固溶-时效对新型高强高淬透性热挤压Al-Zn-Mg-Cu-Zr合金组织与性能的影响[J]. 金属热处理, 2019, 44(1): 86-90.
Jiang Fuqing, Huang Jiwu, Liu Yun, et al. Effects of solution and aging on microstructure and properties of new high-strength and high-hardenability hot-extruded Al-Zn-Mg-Cu-Zr alloy[J]. Heat Treatment of Metals, 2019, 44(1): 86-90.
[3]马思图, 车欣, 王莹, 等. 固溶+时效态Al-8Zn-2.5Mg-1.5Cu(-0.15Y)合金的室温和低温拉伸性能[J]. 金属热处理, 2019, 44(2): 167-171.
Ma Situ, Chen Xin, Wang Ying, et al. Tensile properties at room and low temperature of solid solution treated and aged Al-8Zn-2.5Mg-1.5Cu(-0.15Y) alloys[J]. Heat Treatment of Metals, 2019, 44(2): 167-171.
[4]Yu M, Zhang Y, Li X, et al. Effect of recrystallization on plasticity, fracture toughness and stress corrosion cracking of a high-alloying Al-Zn-Mg-Cu alloy[J]. Materials Letters, 2020, 275: 128074.
[5]许晓静, 贾伟杰, 黄鹏, 等. 不同时效工艺处理Al-Zn-Mg-Cu铝合金的各向异性[J]. 金属热处理, 2018, 43(4): 57-61.
Xu Xiaojing, Jia Weijie, Huang Peng, et al. Anisotropy of Al-Zn-Mg-Cu aluminum alloy under different aging conditions[J]. Heat Treatment of Metals, 2018, 43(4): 57-61.
[6]Liu Y, Jiang D, Xie W, et al. Solidification phases and their evolution during homogenization of a DC cast Al-8.35Zn-2.5Mg-2.25Cu alloy[J]. Materials Characterization, 2014, 93: 173-183.
[7]Deng Y, Yin Z M, Cong F G. Intermetallic phase evolution of 7050 aluminum alloy during homogenization[J]. Intermetallics, 2012, 26: 114-121.
[8]耿振华, 陈志谦, 李春梅, 等. 双级时效对 AA7050 合金组织和性能的影响[J]. 金属热处理, 2012, 37(12): 60-64.
Geng Zhenhua, Chen Zhiqian, Li Chunmei, et al. Effects of two-step aging on microstructure and properties of AA7050 alloy[J]. Heat Treatment of Metals, 2012, 37(12): 60-64.
[9]杨孝鹤. 7475高强铝合金热处理的研究[D]. 沈阳: 东北大学, 2008.
[10]李杰, 尹志民, 王涛, 等. 固溶-单级时效处理对 7055 铝合金力学和电学性能的影响[J]. 轻合金加工技术, 2004, 32(11): 39-43.
Li Jie, Yin Zhimin, Wang Tao, et al. Effect of solution and single-stage aging treatment on the mechanical and electrical properties of 7055 aluminum alloy[J]. Light Alloy Fabrication Technology, 2004, 32(11): 39-43.
[11]Salazarguapuriche M A, Zhao Y Y, Pitman A, et al. Correlation of strength with hardness and electrical conductivity for aluminum alloy 7010[J]. Materials Science Forum, 2006, 519-521: 853-858.
[12]刘晓艳. 含Ag的Al-Cu-Mg耐热铝合金微观组织与性能研究[D]. 长沙: 中南大学, 2011.
[13]Gayle F W, Heubaum F H, Pickens J R. Structure and properties during aging of an ultra-high strength Al-Cu-Li-Ag-Mg alloy[J]. Scripta Metallurgica Et Materialia, 1990, 24(1): 79-84.
[14]田荣璋, 王祝堂, 顾景诚, 等. 铝合金及其加工手册[M]. 2版. 长沙: 中南大学出版社, 2000.

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