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 陈康华 杨振 陈送义 王会平 马云龙

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

华南理工大学学报(自然科学版) >

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

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

材料科学与技术

Si及热处理对Al-Zn-Mg-Cu合金显微组织和腐蚀行为的影响

焦慧彬陈康华杨振陈送义王会平马云龙

展开

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

焦慧彬(1988) ，女，博士生，从事7xxx 系铝合金研究

收稿日期: 2018-04-13

修回日期: 2018-07-10

网络出版日期: 2018-10-02

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)

收起

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

Expand

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)

Fold

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

本文引用格式

焦慧彬陈康华杨振陈送义王会平马云龙 . Si及热处理对Al-Zn-Mg-Cu合金显微组织和腐蚀行为的影响[J]. 华南理工大学学报(自然科学版), 2018 , 46(11) : 68 -75 . DOI: 10.3969/j.issn.1000-565X.2018.11.010

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

参考文献

Options

文章导航

模态框（Modal）标题

摘要

本文引用格式

Abstract

参考文献