不同时效工艺处理Al-Zn-Mg-Cu铝合金的各向异性  

Anisotropy of Al-Zn-Mg-Cu aluminum alloy under different aging conditions

作　　者：许晓静[1] 贾伟杰 黄鹏[1] 杜东辉[1] 张冲[1] 张景玉[1] Xu Xiaojin;Jia Weijie;Huang Peng;Du Donghui;Zhang Chong;Zhang Jingyu(Engineering Institute of Advanced Manufacturing and Modern Equipment Technology, Jiangsu University, Zhenjiang Jiangsu 212013, China)

机构地区：[1]江苏大学先进制造与现代装备技术工程研究院

出　　处：《金属热处理》2018年第4期57-61,共5页Heat Treatment of Metals

基　　金：江苏大学优秀青年学术骨干培育专项基金(1211110001);江苏省高校研究生科研创新计划(CXLX110563);江苏省普通高校研究生科研创新计划(CXLX12_0620)

摘　　要：通过金相显微镜观察和硬度、电导率以及抗腐蚀性能测试，研究了A1-Zn-Mg-Cu铝合金挤压一热压材微观组织和不同时效工艺下硬度、电导率和抗腐蚀性能的各向异性。结果表明：铝合金挤压一热压材微观组织形貌呈现出各向异性，L-S面上部分晶粒呈等轴状，而T-S面与L-T面上的晶粒则沿拉伸方向拉长。在不同时效工艺下，材料L-T面的硬度、电导率值均略高于T-S和L-S面。随着时效时间增加，抗晶间腐蚀性能和抗剥落腐蚀性能均有所提高，L-T面的抗晶间腐蚀性能要优于L-S和T-S面，但是抗剥落腐蚀性能不如L-S和T-S面。The anisotropy of the microstructure as-extrusion and hot pressed as well as the hardness, conductivity and corrosion resistance after treated by different aging processes of an A1-Zn-Mg-Cu aluminum alloy were investigated by OM, hardness test, conductivity test, corrosion tests. The results indicate that the microstructure of the aluminum alloy as-extrusion and hot pressed is anisotropic. Some grains on the L-S plane are of equiaxed shape, while the grains on the T-S and L-T planes are elongated along the compression direction. Under different aging conditions, the hardness and conductivity of L-T plane are relatively higher than those in the L-S and T-S planes. With the increase of aging time, both the intergranular corrosion resistance and the exfoliation corrosion resistance are improved, and the intergranular corrosion resistance of L-T plane is better than that of L-S and T-S planes, but the exfoliation resistance is poorer.

关 键 词：铝合金 时效工艺 微观组织 性能 各向异性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]