华南理工大学学报(自然科学版) ›› 2018, Vol. 46 ›› Issue (11): 68-75.doi: 10.3969/j.issn.1000-565X.2018.11.010

• 材料科学与技术 • 上一篇    下一篇

Si及热处理对Al-Zn-Mg-Cu合金显微组织和腐蚀行为的影响

焦慧彬1 陈康华1,2 杨振1 陈送义1 王会平3 马云龙3   

  1. 1. 中南大学 轻合金研究院,湖南 长沙 410083;
    2. 中南大学 有色金属先进结构材料与制造协同创新中心, 湖南 长沙 410083;
    3. 北京宇航系统工程研究所,北京 100076
  • 收稿日期:2018-04-13 修回日期:2018-07-10 出版日期:2018-11-25 发布日期:2018-10-02
  • 通信作者: 陈康华(1962) ,男,博士,教授,主要从事铝合金研究 E-mail:khchen@csu.edu.cn
  • 作者简介:焦慧彬(1988) ,女,博士生,从事7xxx 系铝合金研究
  • 基金资助:
    国家重点研发计划项目( 2016YFB0300801) ;
    国家自然科学基金重大科研仪器设备研制专项( 51327902) 

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

JIAO Huibin1 CHEN Kanghua1, 2 YANG Zhen1 CHEN Songyi1 WANG Huiping3 MA Yunlong3   

  1. 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
  • Received:2018-04-13 Revised:2018-07-10 Online:2018-11-25 Published:2018-10-02
  • Contact: 陈康华(1962) ,男,博士,教授,主要从事铝合金研究 E-mail:khchen@csu.edu.cn
  • About author:焦慧彬(1988) ,女,博士生,从事7xxx 系铝合金研究
  • 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) 

摘要: 采用慢应变速率试验研究了不同Si含量和热处理条件下Al-Zn-Mg-Cu合金的应力腐蚀开裂(SCC)行为。使用透射电子显微镜(TEM)和统计分析确定晶界微观结构。研究表明:通过增加Si含量和时效程度来改善合金的耐SCC性能。晶界沉淀相(GBPs)面积分数是评估SCC敏感性的重要参数。对于不同时效程度的Al-Zn-Mg-Cu-0.16Zr-0.04Si(wt%)合金,当GBPs的面积分数相对较低时,SCC的主导机制是氢脆。对于峰时效状态下的Al-Zn-Mg-Cu合金和Al-Zn-Mg-Cu-0.16Zr-0.02Si (wt%)合金,当GBPs的面积分数足够高时,阳极溶解主导SCC。

关键词: 铝合金, 应力腐蚀开裂, 晶界, 腐蚀行为

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

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