Influence of exfoliation corrosion on tensile properties of a high strength Al-Zn-Mg-Cu alloy  

作　　者：刘胜胆 廖文博 唐建国 张新明 刘心宇 

机构地区：[1]School of Materials Science and Engineering,Central South University [2]School of Materials Science and Engineering,Guilin University of Electronic Science and Technology

出　　处：《Journal of Central South University》2013年第1期1-6,共6页中南大学学报（英文版）

基　　金：Project(2012CB619500) supported by the National Basic Research Program of China;Project(201012200238) supported from the Freedom Explore Program of Central South University, China

摘　　要：The influence of exfoliation corrosion on the tensile properties of a high strength Al-Zn-Mg-Cu alloy was investigated by ambient temperature tensile testing, optical microscopy, transmission electron microscopy （TEM）, scanning electron microscopy （SEM） and electron backscatter diffraction （EBSD）. After exfoliation corrosion immersion, blisters and corrosion pits can be seen on the sheet surface, which lead to loss of materials and notches. A number of intergranular cracks are observed to initiate at the bottom of the corrosion-induced notches and propagate rapidly into the bulk materials during tensile. Consequently, exfoliation corrosion results in significant loss of strength and brittle fracture. EBSD results show that the crack propagation path is primarily along the grain boundaries with misorientation of-45°, and coincidence site lattice （CSL） boundaries are slightly more resistant to crack.高强度 Al-Zn-Mg-Cu 合金的张力的性质上的脱落腐蚀的影响被周围的温度调查张力的严峻的、光显微镜学，传动电子显微镜学(TEM ) ，扫描电子显微镜学(SEM ) 和电子反散射衍射(EBSD ) 。在脱落腐蚀沉浸以后，水泡和腐蚀坑能在表表面上被看见，它导致材料和槽口的损失。很多个 intergranular 裂缝被观察在导致腐蚀的槽口的底部开始并且很快宣传进体积材料在期间张力。因而，脱落腐蚀导致力量和易碎的骨折的重要损失。EBSD 结果证明裂缝繁殖路径主要沿着有 45

关 键 词：EXFOLIATION tensile properties FRACTURE grain boundaries Al-Zn-Mg-Cu alloy 

分 类 号：TG146.21[一般工业技术—材料科学与工程]