6082铝合金轧制板材截面分层异色机理研究  

Study on the mechanism of delamination and discoloration in the cross-section of 6082 aluminum alloy rolled sheet

作　　者：陈清 高崇 冉继龙 邱秀矫 CHEN Qing;GAO Chong;RAN Jilong;QIU Xiujiao(Chinalco Ruimin Co.,Ltd.,Fuzhou 350015,China;Light Alloy Materials Institute,Chinalco Materials Application Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]中铝瑞闽股份有限公司,福建福州350015 [2]中铝材料应用研究院有限公司,轻合金材料所,北京102209

出　　处：《轻合金加工技术》2024年第5期41-45,共5页Light Alloy Fabrication Technology

摘　　要：6082T6铝合金板材截面(RD-ND面)腐蚀后呈现分层异色现象,通过金相显微镜、扫描电子显微镜、显微硬度仪等手段,研究了板材截面不同区域的微观组织及力学性能。结果表明:腐蚀后6082T6铝合金截面表层、次表层、中心层呈现明暗不同的色泽。由于腐蚀后在表面层和中心层上形成的黑色凹坑面积占比较小,导致粗糙度低于次表层,从而具有较高的镜面反射率。与次表层相比,中心层的抗拉强度略有降低,断后伸长率显著增大,是因为中心层长条状晶粒尺寸较大,且第二相颗粒数量少。In response to the delamination and discoloration phenomenon of the cross-section(RD-ND surface)of 6082T6 aluminum alloy sheet after corrosion,the microstructure and mechanical properties of different areas of the cross-section(RD-ND surface)were studied by means of metallographic microscope,scanning electron microscope,and microhardness tester.The results show that after corrosion,the surface,subsurface,and central layers exhibit varying shades of light and dark.Due to the small area black pits formed on the surface and central layers after corrosion,the roughness is lower than that of the subsurface,resulting in a higher mirror reflectivity.Compared with the subsurface layer,the tensile strength of the central layer slightly decreases,and the elongation after fracture significantly increases.This is because the central layer has larger elongated grain sizes and fewer second phase particles.

关 键 词：6082铝合金 色差 第二相 粗糙度 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG153.6[金属学及工艺—金属材料]