Effect of Er and Zr microalloying on microstructure and properties of Al-Zn-Mg alloy

doi:10.13251/j.issn.0254-6051.2023.04.003

Abstract

Abstract: Effects of Er and Zr addition on microstructure, mechanical properties and corrosion properties of Al-Zn-Mg alloy were studied. The results show that the composite addition of Er and Zr can significantly improve the hardness, strength and corrosion resistance of the alloy. With the addition of Er and Zr elements, nano-sized Al₃(Er,Zr) precipitates are dispersed in the matrix, which can hinder dislocation movement and grain boundary migration, and significantly increase the strength of the alloy. In addition, the addition of Er element refines grain of the alloy, which not only increases the strength, but also guarantees a certain elongation, and makes the alloy also have good anti exfoliation corrosion performance.

Key words: Al-Zn-Mg alloy, microalloying, microstructure, mechanical properties, corrosion resistance

CLC Number:

TG146.21

Liu Yang, Wu Xiaolan, Rao Mao, Mao Xuejing, Gao Kunyuan, Wei Wu, Xiong Xiangyuan, Huang Hui. Effect of Er and Zr microalloying on microstructure and properties of Al-Zn-Mg alloy[J]. Heat Treatment of Metals, 2023, 48(4): 18-22.

References

[1]王郁, 王俊升, 薛程鹏, 等. 微合金化对铝合金高温析出相影响的研究进展[J]. 航空制造技术, 2021, 64(15): 68-77, 85.
Wang Yu, Wang Junsheng, Xue Chengpeng, et al. Review of microalloying effects on high temperature Al₃X precipitates in Al alloys[J]. Aeronautical Manufacturing Technology, 2021, 64(15): 68-77, 85.
[2]方华婵, 杨海林, 朱佳敏, 等. Cr、Mn、Zr、Ti微合金化对Al-Zn-Mg-Cu-Yb合金再结晶、第二相和断裂行为的影响[J]. 稀有金属材料与工程, 2020, 49(3): 797-810.
Fang Huachan, Yang Hailin, Zhu Jiamin, et al. Effect of minor Cr, Mn, Zr or Ti on recrystallization, secondary phases and fracture behavior of Al-Zn-Mg-Cu-Yb alloys[J]. Rare Metal Materials and Engineering, 2020, 49(3): 797-810.
[3]李文才, 吴浩, 崔恩强, 等. 一种新型Er、Zr微合金化Al-Zn-Mg-Cu合金的均匀化处理[J]. 上海金属, 2021, 43(1): 67-71.
Li Wencai, Wu Hao, Cui Enqiang, et al. Homogenizing treatment of a new Al-Zn-Mg-Cu alloy microalloyed with Er and Zr[J]. Shanghai Metals, 2021, 43(1): 67-71.
[4]王旭, 吴私, 刘运腾, 等. Al-Zn-Mg-(Cu)系铝合金微合金化的研究进展[J]. 山东科学, 2014, 27(1): 56-62.
Wang Xu, Wu Si, Liu Yunteng, et al. Research advances of microalloying Al-Zn-Mg-(Cu) series aluminum alloy[J]. Shandong Science, 2014, 27(1): 56-62.
[5]刘懿芳, 田伟, 孙玥. Al-Zn-Mg-Cu系铝合金微合金化的研究进展[J]. 有色金属材料与工程, 2018, 39(1): 38-41.
Liu Yifang, Tian Wei, Sun Yue. Research progress of microalloying of Al-Zn-Mg-Cu aluminum alloy[J]. Nonferrous Metal Materials and Engineering, 2018, 39(1): 38-41.
[6]Zhang Y, Gao K Y, Wen S P, et al. The study on the coarsening process and precipitation strengthening of Al₃Er precipitate in Al-Er binary alloy[J]. Journal of Alloys and Compounds, 2014. 610: 27-34.
[7]Li Z M, Jiang H C, Wang Y L, et al. Effect of minor Sc addition on microstructure and stress corrosion cracking behavior of medium strength Al-Zn-Mg alloy[J]. Journal of Materials Science and Technology, 2018, 34(7): 1172-1179.
[8]Shi Y J, Pan Q L, Li M J, et al. Influence of alloyed Sc and Zr, and heat treatment on microstructures and stress corrosion cracking of Al-Zn-Mg-Cu alloys[J]. Materials Science and Engineering A, 2015, 621(15): 173-181.
[9]Wu H, Wen S P, Huang H, et al. Effects of homogenization on precipitation of Al₃(Er, Zr) particles and recrystallization behavior in a new type Al-Zn-Mg-Er-Zr alloy[J]. Materials Science and Engineering A, 2017, 689: 313-322
[10]Kendig K L, Miracle D B. Strengthening mechanisms of an Al-Mg-Sc-Zr alloy[J]. Acta Materialia, 2002, 50(16): 4165-4175.
[11]Fuller C, Murray J, Seidman D. Temporal evolution of the nanostructure of Al(Sc, Zr) alloys: Part I-Chemical compositions of Al₃(Sc₁_-_xZr_x) precipitates[J]. Acta Materialia, 2005. 53(20): 5401-5413.
[12]Sun Y Q, Luo Y H, Pan Q L, et al. Effect of Sc content on microstructure and properties of Al-Zn-Mg-Cu-Zr alloy[J]. Materials Today Communications, 2020, 26: 101899.
[13]Fang H C, Chao H, Chen K H. Effect of Zr, Er and Cr additions on microstructures and properties of Al-Zn-Mg-Cu alloys[J]. Materials Science and Engineering A, 2014, 610: 10-16.
[14]Wang Y C, Wu X D, Cao L F, et al. Effect of trace Er on the microstructure and properties of Al-Zn-Mg-Cu-Zr alloys during heat treatments[J]. Materials Science and Engineering A, 2020, 792: 139807.
[15]Ralston K, Birbilis N, Davies C. Revealing the relationship between grain size and corrosion rate of metals[J]. Scripta Materialia, 2010, 63(12): 1201-1204.