7020铝合金应力腐蚀开裂特征
Stress Corrosion Cracking of 7020 Aluminum Alloy
摘 要
采用断裂力学双悬臂梁(DCB)试样,对高强度7020铝合金的应力腐蚀开裂(SCC)特征进行了研究.结果表明,7020铝合金在含Cl-的水溶液中对SCC敏感,板料的Z-X和Z-Y方向有SCC裂纹萌生,裂纹开始萌生的时间较长,扩展速度较慢；温度升高后,裂纹扩展速度明显加快.SCC裂纹的特征为水平扩展,表面有呈台阶式不连续扩展和群集现象,开裂面为沿晶扩展.
双悬臂梁(DCB)试样
沿晶扩展
应力腐蚀开裂(SCC)
7020 aluminum alloy
double cantilever beam (DCB) specimen
intergranular expanding
stress corrosion cracking(SCC)
Abstract
The stress corrosion cracking (SCC) caracteristics of 7020 aluminum alloy were studied by usibg the pre-cracked double cantilever beam (DCB) specimen.The results showed that the 7020 aluminum alloy was sensitive to SCC in solution containing Cl-,although the time of crack initiation was relatively long and the crack growth was relatively slow at the “Z-X” and “Z-Y” directions.The crack propagation speed was much faster when temperature increased and the cracks were horizontally extended.Some step-like discontinuous expansion and clustering phenomena were found on the surface.Results of SEM showed that the cracks were intergranular.
中图分类号 TG172.9 TG146.2+
所属栏目 试验研究
基金项目
收稿日期 2009/10/22
修改稿日期 2009/11/17
网络出版日期
作者单位点击查看
备注王荣,教授级高工.
引用该论文: WANG Rong,CHEN Bing-chuan,LI Guang-fu. Stress Corrosion Cracking of 7020 Aluminum Alloy[J]. Corrosion & Protection, 2010, 31(9): 688～690
共有人对该论文发表了看法，其中：
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】Gür C H,Yldiz I.Non destructive investigation on the effect of precipitation hardening on impact toughness of 7020 Al-Zn-Mg alloy[J].Materials Science and Engineering A,2004,382:395-400.
【2】Liu J,Kulak M.A new parading in the design of aluminum alloy for aerospace applications[J].Materials Science Forum,2000,331-337:127-140.
【3】Heinz A,Haszler A,Keidel C.Recent development in aluminium alloy for aerospace applications[J].Materials Science Engineering A,2000,A280(1):102-107.
【4】孙志华,刘明辉,张晓云,等.时效制度对Al-Zn-Mg-Cu铝合金应力腐蚀敏感性的影响[J].中国腐蚀与防护学报,2006,26(4):232-236.
【5】王荣,鄢国强,李光福,等.7020铝合金列车车钩梁开裂原因与机理[J].中国腐蚀与防护学报,2008,28(4):240-245.
【2】Liu J,Kulak M.A new parading in the design of aluminum alloy for aerospace applications[J].Materials Science Forum,2000,331-337:127-140.
【3】Heinz A,Haszler A,Keidel C.Recent development in aluminium alloy for aerospace applications[J].Materials Science Engineering A,2000,A280(1):102-107.
【4】孙志华,刘明辉,张晓云,等.时效制度对Al-Zn-Mg-Cu铝合金应力腐蚀敏感性的影响[J].中国腐蚀与防护学报,2006,26(4):232-236.
【5】王荣,鄢国强,李光福,等.7020铝合金列车车钩梁开裂原因与机理[J].中国腐蚀与防护学报,2008,28(4):240-245.
相关信息
