Journal of South China University of Technology(Natural Science) >

2018 , Vol. 46 >Issue 11: 68 - 75

DOI: https://doi.org/10.3969/j.issn.1000-565X.2018.11.010

Materials Science & Technology

Influence of Si and heat treatment on microstructures and corrosion behavior of Al–Zn–Mg–Cu alloys

  • JIAO Huibin CHEN Kanghua YANG Zhen CHEN Songyi WANG Huiping MA Yunlong
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  • 1． Light Alloy Ｒesearch Institute，Central South University，Changsha 410083，Hunan，China;
    2． Collaborative Innovation Center of Advance Nonferrous Structural Materials and Manufacturing，Central South University，Changsha 410083， Hunan，China;
    3． Beijing Institute of Astronautical Systems Engineering，Beijing 100076，China
焦慧彬(1988) ，女，博士生，从事7xxx 系铝合金研究

Received date: 2018-04-13

  Revised date: 2018-07-10

  Online published: 2018-10-02

Supported by

The National Key Ｒesearch and Development Program of China( 2016YFB0300801) and the Major Ｒesearch Equipment Development Projects of National Natural Science Foundation of China( 51327902) 

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Abstract

Stress corrosion cracking (SCC) behavior of Al-Zn-Mg-Cu alloys with different Si contents and heat treatments was studied using slow strain rate test. Grain boundary microstructures were identified by transmission electron microscopy (TEM) and statistical analysis. It was found that the SCC resistance of alloys is improved by increasing Si contents and aging degree. Grain boundary precipitates (GBPs) area fraction was found to be an important parameter to evaluate the SCC susceptibility. The results reveal that for Al-Zn-Mg-Cu-0.16Zr-0.04Si(wt%) alloy with different aging degrees, hydrogen induced cracking dominates the SCC when the area fraction of GBPs is relatively low. For peak-aged Al-Zn-Mg-Cu alloy and Al-Zn-Mg-Cu-0.16Zr-0.02Si(wt%) alloy, anodic dissolution dominates the SCC when the area fraction of GBPs is sufficiently high.

Key words： aluminum alloy; stress corrosion cracking; grain boundary; corrosion behavior

Cite this article

JIAO Huibin CHEN Kanghua YANG Zhen CHEN Songyi WANG Huiping MA Yunlong . Influence of Si and heat treatment on microstructures and corrosion behavior of Al–Zn–Mg–Cu alloys[J]. Journal of South China University of Technology(Natural Science), 2018 , 46(11) : 68 -75 . DOI: 10.3969/j.issn.1000-565X.2018.11.010

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