Precipitation behavior of Al-Zn-Mg-Cu-Sc-Zr alloy during homogenization process

被引：0
|
作者：
Li H. [1 ,2 ]
Tang K. [1 ]
Wang H. [1 ]
Wang K.-S. [2 ]
Li Y.-K. [3 ]
Wu Y.-C. [1 ,3 ]
机构：
[1] Anhui Province Key Laboratory of Aerospace Structural Parts Forming Technology and Equipment, Hefei University of Technology, Hefei
[2] Chinaland Solar Energy Co., Ltd., Hefei
[3] National-Local Joint Engineering Research Center of Nonferrous Metals and Processing Technology, Hefei University of Technology, Hefei
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2021年 / 31卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Al-Zn-Mg-Cu-Sc-Zr alloy; Al[!sub]3[!/sub]Sc; Homogenization; Phase transformation;
D O I：
10.11817/j.ysxb.1004.0609.2021-40096
中图分类号：
学科分类号：
摘要：
In this paper, the structure transformation and element distribution of Al-Zn-Mg-Cu-Zr alloy with 0.2% Sc(mass fraction) in different states were studied. The results show that the addition of 0.2% Sc can help suppress dendrite segregation and eliminate the non-equilibrium eutectic structure, then an alloy with a grain size of 55-80 μm (accounting for 75% of the total) is obtained. A large number of T(AlZnMgCu) phases are distributed at the grain boundaries of the as-cast structure. After being kept at 465 ℃ for 24 h, the T phase is completely transformed into S(Al2CuMg) phase. Holding at 465℃ for 24 h, the S phase disappears at the grain boundary and only a small amount of impurity phase (Al7Cu2Fe) remains. Through the two-stage homogenization treatment, the average grain size is reduced to 40 μm. A large amount of L12-type Al3Sc phases with the sizes of about 40 nm are dispersed inside the alloy, which are completely coherent with the α(Al) matrix and effectively hinder the coarsening of grains. © 2021, China Science Publishing & Media Ltd. All right reserved.
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页码：2403 / 2411
页数：8
相关论文
共 16 条
  • [1] LUKASAK D A, HART R M., Aluminum alloy development efforts for compression dominated structure of aircraft, Light Metal Age, 49, pp. 11-15, (1991)
  • [2] DUMONT D, DESCHAMPS A, BRECHET Y., On the relationship between microstructure, strength and toughness in AA7050 aluminum alloy, Materials Science and Engineering A, 356, 1, pp. 326-336, (2003)
  • [3] DIXIT M, MISHRA R S, SANKARAN K K., Structure-property correlations in Al 7050 and Al 7055 high-strength aluminum alloys, Materials Science and Engineering A, 478, 1, pp. 163-172, (2008)
  • [4] CHEN Kang-hua, LIU Hong-wei, ZHANG Zhuo, Et al., The improvement of constituent dissolution and mechanical properties of 7055 aluminum alloy by stepped heat treatments, Journal of Materials Processing Technology, 142, 1, pp. 190-196, (2003)
  • [5] IBRAHIM M F, SAMUEL A M., A preliminary study on optimizing the heat treatment of high strength Al-Cu-Mg-Zn alloys, Materials and Design, 57, 13, pp. 342-350, (2014)
  • [6] XIANG H, PAN Q L, YU X H, Et al., Superplasticity behaviors of Al-Zn-Mg-Zr cold-rolled alloy sheet with minor Sc addition, Materials Science and Engineering A, 676, pp. 128-137, (2016)
  • [7] GAO Y H, KUANG J, LIU G, Et al., Effect of minor Sc and Fe co-addition on the microstructure and mechanical properties of Al-Cu alloys during homogenization treatment, Materials Science and Engineering A, 746, pp. 11-26, (2019)
  • [8] XU Pian, JIANG Feng, TANG Zhong-qin, Et al., Coarsening of Al<sub>3</sub>Sc precipitates in Al-Mg-Sc alloys, Journal of Alloys and Compounds, 781, pp. 209-215, (2019)
  • [9] HE Zhen-bo, LI Hui-zhong, LIANG Xiao-peng, Et al., Hot compression deformation behavior and processing maps of Al-Zn-Mg-Sc-Zr alloy, The Chinese Journal of Nonferrous Metals, 21, 6, pp. 1220-1228, (2011)
  • [10] CHEN Qin, PAN Qing-lin, WANG Ying, Et al., Effect of trace Sc and Zr on microstructure and mechanical properties of Al-Mg-Mn alloy, The Chinese Journal of Nonferrous Metals, 22, 6, pp. 1555-1563, (2012)
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