Effect of grain structure on stress corrosion resistance of Al-Zn-Mg alloy

被引：1
|
作者：
Ye L. [1 ,2 ,3 ]
Yao X. [1 ,2 ,3 ]
Tang J. [1 ,2 ,3 ]
Li H. [1 ]
Zhang X. [1 ,2 ,3 ]
机构：
[1] School of Materials Science and Engineering, Central South University, Changsha
[2] Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha
[3] Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 05期
关键词：
Al-Zn-Mg alloy; Grain boundary microstructures; Grain structure; Stress corrosion cracking resistance;
D O I：
10.11817/j.issn.1672-7207.2019.05.006
中图分类号：
学科分类号：
摘要：
Stress corrosion cracking(SCC) resistance of the specimens with different grain structures in Al-Zn-Mg alloy extruded profile was investigated through four-point bending test. The relationship and mechanism between grain structure and SCC resistance were studied by means of optical micrograph(OM), electron back scattered diffraction(EBSD) and transmission electron microscope(TEM).The results show that coarse grain structure, equiaxed grain structure and fiber-like structure are distributed from the surface to the center in Al-Zn-Mg alloy extruded profiles. The thickness of coarse grain structure and equiaxed grain structure are about 60 μm and 750 μm, respectively. The fraction of recrystallization and high angle grain boundary(HAGB) decrease gradually from the surface to the center. The SCC resistance of different grain structures is mainly related to grain size and grain boundary microstructures. Compared with the coarse grain and equiaxed grain structures, the fiber-like structure exhibits better stress corrosion cracking resistance because of the smaller grain size, less high angle grain boundary, more spaced grain boundary precipitates (GBPs) and narrower precipitate free zone (PFZ) caused by limiting recrystallization. © 2019, Central South University Press. All right reserved.
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页码：1049 / 1055
页数：6
相关论文
共 26 条
  • [1] Heinz A., Haszler A., Keidel C., Et al., Recent development in aluminium alloys for aerospace applications, Materials Science and Engineering A, 280, 1, pp. 102-107, (2000)
  • [2] Dursun T., Soutis C., Recent developments in advanced aircraft aluminium alloys, Materials & Design, 56, 4, pp. 862-871, (2014)
  • [3] Speidel M.O., Stress corrosion cracking of aluminum alloys, Metallurgical Transactions A, 6, 4, pp. 631-651, (1975)
  • [4] Yang T., Ye L., Shan Z., Et al., Effect of pre-aging on microstructure and stress corrosion resistance of 7020 aluminum alloy, The Chinese Journal of Nonferrous Metals, 26, 5, pp. 947-956, (2016)
  • [5] Li J., Peng Z., Li C., Et al., Mechanical properties, corrosion behaviors and microstructures of 7075 aluminium alloy with various aging treatments, Transactions of Nonferrous Metals Society of China, 18, 4, pp. 755-762, (2008)
  • [6] Park J.K., Influence of retrogression and reaging treatments on the strength and stress corrosion resistance of aluminium alloy 7075-T6, Materials Science and Engineering A, 103, 2, pp. 223-231, (1988)
  • [7] Shi Y., Pan Q., Li M., Et al., Influence of alloyed Sc and Zr, and heat treatment on microstructures and stress corrosion cracking of Al-Zn-Mg-Cu alloys, Materials Science and Engineering A, 621, 1, pp. 173-181, (2015)
  • [8] Kannan M.B., Raja V.S., Enhancing stress corrosion cracking resistance in Al-Zn-Mg-Cu-Zr alloy through inhibiting recrystallization, Engineering Fracture Mechanics, 77, 2, pp. 249-256, (2010)
  • [9] Fang H., Chao H., Chen K., Effect of recrystallization on intergranular fracture and corrosion of Al-Zn-Mg-Cu-Zr alloy, Journal of Alloys and Compounds, 622, 2, pp. 166-173, (2015)
  • [10] Fang H., Chen K., Chen X., Et al., Effect of Cr, Yb and Zr additions on localized corrosion of Al-Zn-Mg-Cu alloy, Corrosion Science, 51, 12, pp. 2872-2877, (2009)
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