7055铝合金挤压材黑线缺陷分析  

Analysis on black line defects in 7055 aluminum alloy extrusion profiles

作　　者：张江斌 陈愿情[1] 何克准[1] 李剑[1] Zhang Jiangbin;Chen Yuanqing;He Kezhun;Li Jian(Guangxi Key Laboratory of Materials and Processes of Aluminum Alloys,Guangxi Alnan Aluminum Fabrication Co.,Ltd.,Nanning Guangxi 530031,China)

机构地区：[1]广西南南铝加工有限公司广西铝合金材料与加工重点实验室

出　　处：《金属热处理》2020年第1期251-253,共3页Heat Treatment of Metals

基　　金：广西科学研究与技术开发项目(桂科重1598001-3)

摘　　要：利用高倍组织观察,结合能谱分析,对7055铝合金挤压材阳极氧化后的"黑线"缺陷进行了分析。结果表明:"黑线"区域为Al Zr聚集导致。通过严格控制原料质量,改善Al Zr中间合金组织;在合金成分范围内,适当降低Zr元素的含量;熔炼过程中适当提高加热温度及时间,使Al3Zr粒子熔解等手段,可消除"黑线"缺陷。"Black line"defects on the surface of 7055 aluminum alloy extrusion profiles after anodic oxidation were identified by high-magnification optical microscope combined with energy spectrum analysis. The results show that the"black line"defects are caused by AlZr aggregation. Such defects can be eliminated by strictly controlling the quality of raw materials,improving the microstructure of AlZr master alloy,properly reducing the content of Zr element in the alloy composition range,increasing the heating temperature and time in the melting process,and melting the Al3Zr particles.

关 键 词：7055铝合金 阳极氧化 AlZr中间合金 黑线缺陷 

分 类 号：TG115[金属学及工艺—物理冶金]