Cu元素对Al-Zn-Mg-Er-Sc-Zr合金组织演变和腐蚀性能的影响  

Effect of Element Cu on Microstructure Evolution and Corrosion Resistance of Al-Zn-Mg-Er-Sc-Zr Alloy

作　　者：孟令刚[1] 武晓辉 邢清源 亚斌[1] 周秉文[1] 朱秀荣[3] 张兴国[1] Meng Linggang;Wu Xiaohui;Xing Qingyuan;Ya Bin;Zhou Bingwen;Zhu Xiurong;Zhang Xingguo(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Ningbo Branch,Ordnance Science Institute of China,Ningbo 315103,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]中国航发北京航空材料研究院,北京100095 [3]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《稀有金属材料与工程》2022年第12期4475-4482,共8页Rare Metal Materials and Engineering

基　　金：National Key Research and Development Program of China(2018YFA0702900);Science and Technology Innovation Major Project of Ningbo(2019B10101)。

摘　　要：利用Cu元素的含量变化研究了Al_(8)Cu_(4)Er相的形成与演变规律及其对Al-Zn-Mg-Er-Sc-Zr合金腐蚀性能的影响。结果表明:随着Cu含量的增加,合金晶粒得到显著细化,但同时固溶态合金不同类型的残余相增多;Al_(8)Cu_(4)Er相与Al-Fe相存在伴生关系,二者通过Cu与Fe交互作用实现相的转化,且可表述为如下关系式:Al_(6)Fe→^(Cu)Al_(60)Cu_(30)Fe_(10)→^(Er)Al_(8)Cu_(4)Er;不同成分合金的晶间腐蚀均表现出与残余相密切相关的点蚀特征,含Cu、Er的Al-Fe相虽然具有更小的腐蚀坑尺寸,但网状分布特征使腐蚀深度有所增加;而具有更好耐蚀性能的Al8Cu4Er则因相的粗化和它与Al-Fe相的伴生关系导致合金耐蚀性能严重下降。The formation and evolution of the Al_(8)Cu_(4)Er phase and its influence on the corrosion resistance of Al-Zn-Mg-Er-Sc-Zr alloys were studied by changing the element content of Cu.The results show that with the increase in Cu content,the grains of the alloy are significantly refined,but at the same time,different types of residual phases in the solid-solution-state of the alloy increase.There is a companion relationship between the Al_(8)Cu_(4)Er phase and the Al-Fe phase,and they achieve phase transformation through the interaction between Cu and Fe.It can be expressed as the relationship:Al_(6)Fe→^(Cu)Al_(60)Cu_(30)Fe_(10)→^(Er)Al_(8)Cu_(4)Er.The intergranular corrosion of alloys with different compositions shows pitting characteristics closely related to the residual phase.Although the Al-Fe phase containing Cu and Er has a smaller corrosion pit size,the network distribution characteristics increase the corrosion depth,while the Al8Cu4Er with better corrosion resistance has a serious decline in the counterpart of the alloy due to its tendency to coarsen and interactive relationship with the Al-Fe phase.

关 键 词：Al-Zn-Mg-Cu-Er铝合金 Al_(8)Cu_(4)Er相 Al-Fe相 腐蚀性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]