Elimination of Al2CuMg phase during homogenization in  Al-8.0Zn-2.0Mg-2.1Cu alloy

doi:10.13251/j.issn.0254-6051.2020.05.008

Abstract

Abstract: The formation of the insoluble phase Al₂CuMg in a highly alloyed Al-8.0Zn-2.0Mg-2.1Cu (wt%) alloy during homogenization and the process of its full dissolution were studied by means of OM、SEM、EPMA、XRD and DSC. The results show that the main non-equilibrium solidification phase in as-cast alloy is Mg (Zn, Al, Cu)₂ phase, and the elements of Zn, Mg and Cu are segregated seriously. After primary homogenization of heating at 470 ℃ for 40 h, although Mg (Zn, Al, Cu)₂ phase gradually is dissolved back into the matrix and promotes the elimination of dendritic network in the alloy, a harmful phase Al₂CuMg with high temperature stablity is formed in the alloy. Furthermore, the high temperature homogenization process of heating at 485 ℃ for 14 h is used to realize the full dissolution of the high temperature stable phase Al₂CuMg. The proper homogenization processing is heating at 470 ℃ for 40 h and 485 ℃ for 14 h, which is consistent with the results of homogenizing kinetic analysis.

Key words: Al-Zn-Mg-Cu alloy, homogenization, phase transformation, microstructure

CLC Number:

TG146.2

Zhu Pengcheng, Jiang Lijun, Xiang Kangning, Huang Jie, Yao Dan, Yu Xinxiang. 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.

References

[1]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.
[2]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, Che 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.
[3]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.
[4]Wu L M, Wang W H, Hsub Y F, et al. Effects of homogenization treatment on recrystallization behavior and dispersoid distribution in an Al-Zn-Mg-Sc-Zr alloy[J]. Journal of Alloys and Compounds, 2008, 456: 163-169.
[5]Sharma M M. Microstructural and mechanical characterization of various modified 7XXX series spray formed alloys[J]. Materials Characterization, 2008, 59(1): 91-99.
[6]Dehmas M, Weisbecker P, Geandier G, et al. Experimental study of phase transformations in 3003 aluminium alloys during heating by in situ high energy X-ray synchrotron radiation[J]. Journal of Alloys and Compounds, 2005, 400: 116-124.
[7]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.
[8]Deng Y, Yin Z M, Cong F G. Intermetallic phase evolution of 7050 aluminum alloy during homogenization[J]. Intermetallics, 2012, 26: 114-121.
[9]Liu X T, Cui J Z. Study on the diffusion kinetics of aluminum alloy cast during homogenizing treatment[J]. Materials Review, 2004, 18(6): 102-104.
[10]Ujihara T, Fujiwara K, Sazaki G, et al. Evaluation of the diffusion coefficients in liquid GaGe binary alloys using a novel method based on Fick's first law[J]. Journal of Non-Crystalline Solids, 2002, 312: 196-202.
[11]Liu X Y, Pan Q L, Fan X, et al. Microstructural evolution of Al-Cu-Mg-Ag alloy during homogenization[J]. Journal of Alloys and Compounds, 2009, 484(1/2): 790-794.
[12]Xie F, Yan X, Ding L, et al. A study of microstructure and microsegregation of aluminum 7050 alloy[J]. Materials Science and Engineering: A, 2003, 355(1/2): 144-153.

[1]	Wang Yudai, Liu Yang, Zhu Yanyan, Tian Xiangjun, Cheng Xu, Ran Xianzhe, Qian Tingting. Effect of heat treatment on microstructure homogeneity and tensile properties of hybrid fabricated AerMet100 ultra-high strength steel [J]. Heat Treatment of Metals, 2022, 47(4): 1-9.
[2]	Zhang Ziyan, Chen Jun, Chen Xiaoya, Li Quan'an, Liu Jianxin. Effect of solution and aging treatment on microstructure and corrosion resistance of Mg-4Sm-3Gd-0.5Zr alloy [J]. Heat Treatment of Metals, 2022, 47(4): 10-16.
[3]	Liang Enpu, Xu Le, Yang Yong, Wang Maoqiu. Effects of Al and Cu additions on microstructure and mechanical properties of 40CrNi3MoV steel [J]. Heat Treatment of Metals, 2022, 47(4): 17-23.
[4]	Qi Xiaoliang, Li Yan, Ding Wei, Zhao Zengwu. Effect of original microstructure of medium manganese TRIP steel containing Al on microstructure and mechanical properties after intercritical annealing [J]. Heat Treatment of Metals, 2022, 47(4): 24-29.
[5]	Chen Baoan, Zhang Jingyuan, Zhu Zhixiang, Han Yu, Pan Xuedong, Zhang Lei, Chen Suhong. Effect of chemical composition on microstructure and properties of high strength Al-Mg-Si alloy [J]. Heat Treatment of Metals, 2022, 47(4): 30-38.
[6]	Chen Dongjun, Li Guangyang, Liu Gang. Effect of aging treatment on microstructure and mechanical properties of AlSi9Cu3 HPDC aluminum alloy [J]. Heat Treatment of Metals, 2022, 47(4): 53-56.
[7]	Chen Liansheng, Zhang Luyou, Tian Yaqiang, Yang Zixuan, Li Hongbin, Pan Hongbo, Wei Yingli. CCT curves and microstructure and properties of low-carbon high strength marine steel [J]. Heat Treatment of Metals, 2022, 47(4): 63-68.
[8]	Jia Changyuan, Huo Yuanming, He Tao, Huo Cunlong, Liu Keran. High temperature tensile deformation behavior and microstructure evolution law of 40CrNiMo steel [J]. Heat Treatment of Metals, 2022, 47(4): 69-74.
[9]	Wang Yunlong, Yu Wei, Zhang Yi, Shi Jiaxin, Li Minghui. Effect of austenitizing temperature on isothermal transformation and mechanical properties of bainite steel [J]. Heat Treatment of Metals, 2022, 47(4): 80-85.
[10]	Liu Liyan, Bi Wenzhen, Wei Xicheng. Effect of Mn element on microstructure evolution of galvanized coating of hot stamping steel [J]. Heat Treatment of Metals, 2022, 47(4): 93-99.
[11]	Fu Xibin, Chen Zihao, Zhang Ke, Zhao Shiyu, Sun Xinjun, Zhu Zhenghai, Liang Xiaokai, Yong Qilong. Effect of quenching temperature on microstructure and mechanical properties of high Ti low alloy wear-resistant steel [J]. Heat Treatment of Metals, 2022, 47(4): 122-127.
[12]	Su Pengji, Ma Yonglin, Dong Lili, Yang Xuefeng. Effect of magnetic field pre-annealing on microstructure and texture of CGO steel [J]. Heat Treatment of Metals, 2022, 47(4): 128-132.
[13]	Li Li, Zeng Yan, Wu Xiaochun. Heat treatment process optimization for 4Cr5Mo2VCo steel [J]. Heat Treatment of Metals, 2022, 47(4): 133-140.
[14]	Lü Jiesheng, Song Zhigang, He Jianguo, Feng Han, Zheng Wenjie, Zhu Yuliang. Microstructure transformation and strengthening-plasticization mechanism of S32205 duplex stainless steel after cold rolling and annealing [J]. Heat Treatment of Metals, 2022, 47(4): 141-145.
[15]	Wang Qi, Wu Guangliang. Effect of tempering temperature on microstructure and properties of 1100 MPa grade high-strength steel [J]. Heat Treatment of Metals, 2022, 47(4): 146-150.

Elimination of Al₂CuMg phase during homogenization in Al-8.0Zn-2.0Mg-2.1Cu alloy

PDF

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments