热轧对铸轧T2铜/AA5052铝合金复合板界面组织性能的影响  

Effect of hot rolling on interface microstructure and properties of cast-rolled T2 copper/AA5052 aluminum alloy composite plates

作　　者：徐潘宁 曲之豪 水正宇 付金禹 李勇[3] 许光明[1] 王小鑫[2] XU Panning;QU Zhihao;SHUI Zhengyu;FU Jinyu;LI Yong;XU Guangming;WANG Xiaoxin(Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education),Northeastern University,Shenyang 110819,China;Northeast Light Alloy Co.,Ltd.,Harbin 150060,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,沈阳110819 [2]东北轻合金有限责任公司,黑龙江哈尔滨150060 [3]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819

出　　处：《轻合金加工技术》2024年第11期21-30,共10页Light Alloy Fabrication Technology

基　　金：国家自然科学基金资助项目(51790485)。

摘　　要：水平双辊铸轧复合是一种近终成形的技术,但为了满足不同条件下的工业要求,仍需要后续轧制。通过水平双辊铸轧复合技术制备了7 mm厚的T2铜/AA5052铝合金复合板。采用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、电子万能实验机和显微硬度计等研究了该复合材料在不同保温时间下热轧后界面的形貌、显微组织、相、结合强度、剥离形貌和显微硬度。结果表明,铸轧态复合板界面扩散层厚度为3.66μm,界面的平均剥离强度为13.2 N/mm。轧制前保温时间的延长可以促进原子间的相互扩散,提高键合强度;可以提高两侧基体变形协调性,防止破坏界面;在轧制后两侧基体与金属间化合物(IMC)层直接接触区形成机械咬合,产生机械锁紧力。在保温时间为32 min时,界面的平均剥离强度达到了峰值,为28.3 N/mm。Horizontal twin-roll casting and rolling combined process is a near-final forming technology,but in order to meet the industrial requirements under different conditions,it is necessary to carry out subsequent rolling-thinning treatment.A 7 mm-thick T2 copper/AA5052 aluminum alloy composite plate was prepared by horizontal twin-roll casting and rolling composite technology.Scanning electron microscope(SEM),energy dispersive spectrometer(EDS),X-ray diffraction(XRD),electronic universal testing machine and microhardness tester were used to study the interfacial morphology,interfacial microstructure and phases,interfacial bonding strength,interfacial peeling morphology and microhardness of this composite material after hot-rolling under different holding times.The results show that the thickness of the diffusion layer of the as-rolled plate is 3.66μm,and the average peeling strength(APS)is 13.2 N/mm.With the extension of the holding time,firstly,it can promote the atomic inter-diffusion to improve the bonding strength;secondly,it can improve the deformation coordination to prevent the destruction of the interface;thirdly,it can form a mechanical occlusion in the direct contact area between the substrate on both sides and the intermetallic compound(IMC)layer after rolling,which generates a mechanical locking force.The average peeling strength of the interface peaked at 28.3 N/mm at a holding time of 32 min.

关 键 词：铸轧复合 T2铜/AA5052铝复合板 热轧 界面结合强度 

分 类 号：TG335.81[金属学及工艺—金属压力加工]