(1. 北京科技大学 材料科学与工程学院，北京 100083；
2. 河北工程大学 机电工程学院，邯郸 056038)
摘 要: 采用垂直充芯连铸法制备断面尺寸为60 mm×14 mm×7 mm(长×宽×圆角半径)、铜包覆层厚度为2 mm的铜包铝复合材料，并采用扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)和透射电子显微镜(TEM)等对界面的形貌和组成进行表征。结果表明：铜包铝复合材料界面层在近铜侧主要由平面状的Cu9Al4(I区)和胞状的CuAl2(II区)两区组成，在近铝侧为α(Al)+CuAl2伪共晶组织(III区)，而在Cu9Al4和CuAl2之间还残存未转变的高温相Cu3Al2+x。基于分析结果，提出了充芯连铸铜包铝的界面形成机理。
关键字: 铜包铝复合材料；充芯连铸；界面；形成机理
（1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Mechanical and Electrical Engineering, Hebei University of Engineering, Handan 056038, China）
Abstract:Copper cladding aluminum (CCA) composites with the section dimensions of 60 mm×14 mm×7 mm (length×width×round angle radius) and the sheath thickness of 2 mm were fabricated by vertical core-filling continuous casting (VCFC) technology, and the micro-morphology and composition at the interface of CCA composites were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDS), X-ray diffractometry (XRD) and transmission electron microscopy (TEM). The results show that the interface at the side of Cu is composed of the Cu9Al4 planar layer (zone I) and CuAl2 cellular layer (zone II), and that at the Al side is α(Al)+CuAl2 pseudo eutectic structure (zone III) , in addition, the high temperature phase Cu3Al2+x is remained between Cu9Al4 and CuAl2. Thus, the formation mechanism of interface in CCA composites fabricated by core-filling continuous casting was proposed.
Key words: copper cladding aluminum composites; core-filling continuous casting; interface; formation mechanism
