Homogenization process of high magnesium Al-Mg series aluminum alloy

doi:10.13251/j.issn.0254-6051.2024.06.016

Abstract

Abstract: Homogenization process of self-melted high magnesium Al-6.5Mg-0.9Zn alloy was studied using techniques such as DSC, SEM and OM. The over heat temperature of the alloy, grain morphology and second phase composition were characterized and analyzed. The results indicate that the structure of the as-cast Al-6.5Mg-0.9Zn alloy is a quasi equiaxed crystal structure, but there is severe segregation of grain boundary elements and small areas of porosity defects. After homogenization treatment at 435, 442, 449 and 456 ℃ for 8 h, respectively, the dendrite arm spacing increases and the grain size increases from 137.31 μm to 173.83 μm. The retained phase changes from continuous distribution to discontinuous distribution, and the content of the second phase decreases from 0.561% to 0.138%. After homogenization treatment at 449 ℃ for 8 h, no low melting point non-equilibrium eutectic phase dissolution peak is found in the microstructure of the ingot, indicating that for the tested alloy, the optimal homogenization process is heating to 449 ℃ at 30 ℃/h and holding for 8 h.

Key words: Al-Mg series aluminum alloy, dendritic segregation, homogenization treatment, microstructure

CLC Number:

TG146.2

Ma Liang, Sun Ning, Ma Junxing, Chen Tongshuai, Guo Fengjia, Wang Jingtao. Homogenization process of high magnesium Al-Mg series aluminum alloy[J]. Heat Treatment of Metals, 2024, 49(6): 100-105.

References

[1]邓运来, 张新明. 铝及铝合金材料进展[J]. 中国有色金属学报, 2019, 29(9): 2115-2141.
Deng Yunlai, Zhang Xinming. Development of aluminium and aluminium alloy[J]. The Chinese Journal of Nonferrous Metals, 2019, 29(9): 2115-2141.
[2]周芃. 5052Al-Mg合金热塑性变形的微观组织演变及流变行为研究[D]. 武汉: 华中科技大学, 2020.
Zhou Peng. Influence of microstructure heterogentity on the corrosion resistance and microhardeness of 5052Al-Mg alloy[D]. Wuhan: Huazhong University of Science and Technology, 2020.
[3]胡亦鹏. 船舶制造工艺现状及改进对策分析[J]. 船舶物资与市场, 2023, 31(1): 32-34.
[4]李克超. 铝合金船舶的建造工艺研究[J]. 现代制造技术与装备, 2021, 57(6): 104-106.
Li Kechao. Discussion on constructure technology of aluminum alloy ship[J]. Modern Manufacturing Technology and Equipment, 2021, 57(6): 104-106.
[5]杨瑞青, 周静, 王祝堂. 舰船及海洋工程变形铝合金[J]. 轻合金加工技术, 2019, 47(2): 1-8.
Yang Ruiqing, Zhou Jing, Wang Zhutang. Wrought aluminum alloys for ship and marine engineering[J]. Light Alloy Fabrication Technology, 2019, 47(2): 1-8.
[6]吕晓丹, 刘斌, 刘岩,等. 铝合金在海洋环境中的腐蚀行为研究进展[J]. 中国材料进展, 2022, 41(6):477-486.
Lü Xiaodan, Liu Bin, Liu Yan, et al. Research progress on the corrosion behavior of aluminum alloys under marine environment[J]. Matrials China, 2022, 41(6):477-486.
[7]陈佳铭. 铝合金在船舶中的应用分析[J]. 船舶物资与市场, 2020(6):11-12.
[8]刘占先. 铝合金材料在船舶与海洋工程装备中的应用[J]. 船舶物资与市场, 2021, 29(6):47-48.
[9]蒋海春. Zn对5059铝合金组织与性能的影响[D]. 长沙: 中南大学, 2014.
Jiang Haichun. Effects of Zn on microstructures and properties of aluminum alloy 5059[D]. Changsha: Central South University, 2014.
[10]Aballe A, Bethencourt M, Botana F J, et al. EIS study of the electrochemical response of AA5083 alloy under anodic polarisation[J]. Corrosion Reviews, 2000, 18(1): 1-12.
[11]Crane C B, Gangloff R P. Stress corrosion cracking of Al-Mg alloy 5083 sensitized at low temperature[J]. Corrosion, 2016, 72(2): 221-241.
[12]李姗珊, 朱凯, 张海涛, 等. Zn、Ag对Al-Mg合金力学性能和腐蚀性能的影响[J]. 轻合金加工技术, 2022, 50(3): 19-24.
Li Shanshan, Zhu Kai, Zhang Haitao, et al. Influence of Zn and Ag on mechanical and corrosion properties of Al-Mg alloy[J]. Light Alloy Fabrication Technology, 2022, 50(3):19-24.
[13]胡永刚, 董瑞峰, 张肖雨, 等. 5×××系铝合金主要腐蚀形式研究现状及发展趋势[J]. 江西冶金, 2023, 43(1): 39-45.
Hu Yonggang, Dong Ruifeng, Zhang Xiaoyu, et al. Research status and development trend of the main corrosion forms of 5××× series aluminum[J]. Jiangxi Metallurgy, 2023, 43(1): 39-45.
[14]王银行. Zn含量对Al-Mg-Zn-Mn-Cu合金组织和性能的影响[D]. 郑州: 郑州大学, 2022.
Wang Yinhang. Effect of Zn content on microstructure and properties of Al-Zn-Mg-Cu alloys[D]. Zhengzhou: Zhengzhou University, 2022.
[15]谌红果, 卫广智, 马琳, 等. 稀土元素钇和固溶处理对Al-8Mg合金组织和力学性能的影响[J]. 热加工工艺, 2016, 45(4): 76-78.
Chen Hongguo, Wei Guangzhi, Ma Lin, et al. Effect of rare Y and solid solution treatment on microstructure and mechanical properties of Al-8Mg alloy[J]. Hot Working Technology, 2016, 45(4): 76-78.
[16]王华庆. 高强度铸造Al-Mg-Zn合金的研究[D]. 北京: 北京交通大学, 2008.
Wang Huaqing. Study on high strength cast Al-Mg-Zn alloy[D]. Beijing: Beijing Jiaotong University, 2008.
[17]王振玲. Al-Mg合金高压凝固组织与相演变研究[D]. 哈尔滨: 哈尔滨工业大学, 2007.
Wang Zhenling. Invesigation on evolution of microstructure and phase in Al-Mg alloy solidifying under high pressure[D], Harbin: Harbin Institute of Technology, 2007.
[18]王晓芬. 超细晶纳米晶Al-Mg合金不同晶界的溶质元素再分布[D]. 镇江: 江苏大学, 2021.
Wang Xiaofen. Solute redistribution in ultrafine/nano-grained Al-Mg alloys with different grain boundaries[D]. Zhenjiang: Jiangsu University, 2021.
[19]蒋海春, 叶凌英, 张新明, 等. 5059高镁铝合金均匀化热处理工艺[J]. 中南大学学报(自然科学版), 2014, 45(12): 4138-4144.
Jiang Haichun, Ye Lingying, Zhang Xinming, et al. Homogenization heat treatment process of 5059 high Mg containing aluminum alloy[J]. Journal of Central South University(Science and Technology), 2014, 45(12): 4138-4144.
[20]王培, 邵继鹏, 李占国, 等. 5059铝合金的铸态及均匀化组织[J]. 金属热处理, 2015, 40(5): 48-52.
Wang Pei, Shao Jipeng, Li Zhanguo, et al. Microstructure of as-cast and homogenized 5059 aluminum alloy[J]. Heat Treatment of Metals, 2015, 40(5): 48-52.
[21]房洪杰, 刘慧, 孙杰, 等. 5×××系铝合金研究现状及发展趋势[J]. 材料导报, 2023, 37(21): 211-220.
Fang Hongjie, Liu Hui, Sun Jie, et al. Research status and development trend of 5××× series aluminum alloys[J]. Materials Reports, 2023, 37(21): 211-220.