Effect of multi-stage aging on properties of 6061 aluminum alloy via CCD method

doi:10.13251/j.issn.0254-6051.2021.10.016

Abstract

Abstract: Central composite design (CCD) method was used to design the time parameters of solution and two stage aging processes for 6061 aluminum alloy, and a reliable mathematical model of the time parameters and tensile strength (r²=0.9078) was obtained in combination with the mechanical performance test results. Through calculation and analysis of variance, it can be seen that the two-step aging time has a significant effect on tensile strength and is negatively correlated with tensile strength. Based on this, the best heat treatment process consists of solid solution at 550 ℃ for 108 min, peak aging at 180 ℃ for 246 min and then two-step aging at 220 ℃ for 3 min, the tensile strength and elongation of the 6061 aluminum alloy under the process is 345 MPa and 13.5%, respectively.

Key words: 6061 aluminum, heat treatment, response surface, tensile strength

CLC Number:

TG146.2⁺1

Duan Wei, Jian Sicong, Wu Chaoqun, Xiao Yongtong, Lu Fengchi, Li Yu, Hu Zijian, Ming Liang. Effect of multi-stage aging on properties of 6061 aluminum alloy via CCD method[J]. Heat Treatment of Metals, 2021, 46(10): 96-100.

References

[1]Miller W S, Zhuang L, Bottema J, et al. Recent development in aluminium alloys for the automotive industry[J]. Materials Science and Engineering A, 2000, 280(1): 37-49.
[2]Xu J J, Pan Y, Lu T, et al. Synergistic effects of composition and heat treatment on micro-structure and properties of vacuum die cast Al-Si-Mg-Mn alloys[J]. China Foundry, 2018, 15(2): 117-123.
[3]潘道召, 王芝秀, 李海, 等. 双级时效对6061铝合金拉伸性能和晶间腐蚀性能的影响[J]. 中国有色金属学报, 2010, 20(3): 435-441.
Pan Daozhao, Wang Zhixiu, Li Hai, et al. Effects of two-step ageing treatment on tensile properties and intergranular corrosion of 6061 aluminum alloy[J]. Transactions of Nonferrous Metals Society of China, 2010, 20(3): 435-441.
[4]Ranganatha R, Kumar V A, Nandi V S, et al. Multi-stage heat treatment of aluminum alloy AA7049[J]. Transactions of Nonferrous Metals Society of China, 2013, 23(6): 1570-1575.
[5]Wang Y, Liu M, Xiao W, et al. Effects of multi-stage aging treatments on the precipitation behavior and properties of 7136 aluminum alloy[J]. Journal of Alloys and Compounds, 2020, 814: 152256.
[6]Zhang Z, Deng Y, Ye L, et al. Influence of aging treatments on the strength and localized corrosion resistance of aged Al-Zn-Mg-Cu alloy[J]. Journal of Alloys and Compounds, 2020, 846: 156223.
[7]Zaid H R, Hatab A M, Ibrahim A M A. Properties enhancement of Al-Zn-Mg alloy by retrogression and re-aging heat treatment[J]. Journal of Mining and Metallurgy, 2011, 47(1): 31-35.
[8]Ferrer C P, Koul M G, Connolly B J, et al. Improvements in strength and stress corrosion cracking properties in aluminum alloy 7075 via low-temperature retrogression and re-aging heat treatments[J]. Corrosion, 2003, 59(6): 114-145.
[9]Park J K. Influence of retrogression and re-aging treatments on the strength and stress corrosion resistance of aluminium alloy 7075-T6[J]. Materials Science and Engineering A, 1988, 103(2): 223-231.
[10]Peng Guosheng, Chen Kanghua, Chen Songyi, et al. Influence of repetitious-RRA treatment on the strength and SCC resistance of Al-Zn-Mg-Cu alloy[J]. Materials Science and Engineering A, 2011, 528(12): 4014-4018.
[11]Su R M, Qu Y D, Li R D, et al. Influence of RRA treatment on the microstructure and stress corrosion cracking behavior of the spray-formed 7075 alloy[J]. Materials Science, 2015, 51(3): 372-380.
[12]祝向群, 卢锦德. 多级时效对新型高强铸造铝合金组织和性能的影响[J]. 现代机械, 2011(1): 82-83.
Zhu Xiangqun, Lu Jinde. Effects of multistage aging treatment on microstructures and properties of new high strength cast aluminum alloy[J]. Modern Machinery, 2011(1): 82-83.
[13]Montgomery D C. Design and Analysis of Experiments[M]. New York:Wiley and Sons, America, 1976.
[14]Woo K D, Lee J S, Kim S W. Calumet investigation of precipitation kinetics in Al-Mg-Si-X(Cr, Be) alloys[J]. Metals and Materials, 1999, 5(4): 363-368.

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