Correlations among stress corrosion cracking, grain-boundary microchemistry, and Zn content in high Zn-containing Al-Zn-Mg-Cu alloys

Ding-lingYUAN,Song-yiCHEN,Kang-huaCHEN,Lan-pingHUANG,Jiang-yuCHANG,LiangZHOU,Yun-fengDING,

doi:10.1016/S1003-6326(21)65650-9

Transactions of Nonferrous Metals Society of China >

2021 , Vol. 31 >Issue 8: 2220 - 2231

DOI: https://doi.org/10.1016/S1003-6326(21)65650-9

Materials Science and Engineering

Correlations among stress corrosion cracking, grain-boundary microchemistry, and Zn content in high Zn-containing Al-Zn-Mg-Cu alloys

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Ding-ling YUAN^1,2, Song-yi CHEN^1,², Kang-hua CHEN^1,2,3, Lan-ping HUANG^1,2, Jiang-yu CHANG^1,2, Liang ZHOU^1,2, Yun-feng DING^2,3

1. Light Alloy Research Institute, Central South University, Changsha 410083, China;
2. Collaborative Innovation Center of Advanced Nonferrous Structural Materials and Manufacturing, Central South University, Changsha 410083, China;
3. National Key Laboratory of Science and Technology for National Defence on High-Strength Lightweight Structural Materials, Central South University, Changsha 410083, China

Online published: 2021-08-25

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Abstract

The correlations among the corrosion behaviour, grain-boundary microchemistry, and Zn content in Al-Zn-Mg-Cu alloys were studied using stress corrosion cracking (SCC) and intergranular corrosion (IGC) tests, combined with scanning electron microscopy (SEM) and high-angle angular dark field scanning transmission electron microscopy (HAADF-STEM) microstructural examinations. The results showed that the tensile strength enhancement of high Zn-containing Al-Zn-Mg-Cu alloys was mainly attributed to the high density nano-scale matrix precipitates. The SCC plateau velocity for the alloy with 11.0 wt.% Zn was about an order of magnitude greater than that of the alloy with 7.9 wt.% Zn, which was mainly associated with Zn enrichment in grain boundary precipitates and wide precipitates-free zones. The SCC mechanisms of different Zn-containing alloys were discussed based on fracture features, grain-boundary microchemistry, and electrochemical properties.

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Ding-lingYUAN,Song-yiCHEN,Kang-huaCHEN,Lan-pingHUANG,Jiang-yuCHANG,LiangZHOU,Yun-fengDING, . Correlations among stress corrosion cracking, grain-boundary microchemistry, and Zn content in high Zn-containing Al-Zn-Mg-Cu alloys[J]. Transactions of Nonferrous Metals Society of China, 2021 , 31(8) : 2220 -2231 . DOI: 10.1016/S1003-6326(21)65650-9

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