7xxx系高强铝合金厚板断口平台缺陷的研究  

Study of Fracture Platform of High-strength 7xxx Alloy Thick Plate

作　　者：蒋会学[1,2] 长海博文 郭世杰[2] 李亚芳[2] 

机构地区：[1]中铝科学技术研究院,北京100062 [2]苏州有色金属研究院有限公司,江苏苏州215026

出　　处：《有色金属加工》2015年第5期13-16,共4页Nonferrous Metals Processing

摘　　要：研究以80mm厚7xxx系合金板材的冲击断口为研究对象,采用扫描电镜结合能谱分析,考察了断口上平台缺陷的宏观形貌及平台区域所含夹杂物种类,并分析了产生平台缺陷的可能原因。结果表明,平台缺陷呈淡褐色,形状为不规则的长条状,长度方向尺寸通常可达2~3mm;平台缺陷的局部区域含有较多的夹杂物（氧化物、含铁相等）;平台缺陷产生的原因可能为渣气伴生,即铸锭中气孔夹杂共存,轧制过程中气孔沿轧制方向变形,两侧金属由于气体的存在始终不能接触焊合而形成平台缺陷。The paper highlighted impact fractures of 80 mm thick 7xxx alloy plate. Combined SEM with EDS,the paper studied platform defect morphology and inclusion types,and it analyzed possible cause of platform defect. The results showed that the platform defect was brown in appearance with irregularly shaped strip; the measurements were normally 2 ~ 3mm lengthwise;some inclusions such as oxides,iron phase were observed in local area of platform; gas generated with inclusions may cause platform defect,i. e. porosities in cast ingot became deformed along rolling direction in hot rolling,isolating metals around porosity from being welded together and forming platform defect.

关 键 词：7xxx系合金 厚板 断口平台 

分 类 号：TG146.21[一般工业技术—材料科学与工程]