反向挤压双金属铝合金复合管材制备及其微观组织演化分析  

Preparation and microstructure evolution analysis of bimetallic aluminum alloy composite tubes by indirect extrusion

作　　者：乔及森[1,2] 李一佳 张晓波 李琦伦[1,2] QIAO Ji-sen;LI Yi-jia;ZHANG Xiao-bo;LI Qi-lun(College of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《塑性工程学报》2025年第1期49-58,共10页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52063017);2020年甘肃省科技重大专项合作项目-半连续铸造锭生产(20ZD7GJ008)。

摘　　要：采用反向挤压的方法制备出以2024铝合金为套筒、5A02和5A06分别为芯筒的复合管材,探讨了两种复合管材的力学性能和微观组织。结果显示该类双金属复合管材经固溶处理后表现出良好的强度和塑性。其中经过495℃/40 min固溶处理的2024/5A06复合管材塑性显著增强,伸长率比挤压态单质2024合金提高63.1%,抗拉强度比挤压态单质2024合金提高19.9%。在相同工艺下,2024/5A02管材的伸长率和抗拉强度分别比挤压态单质2024合金提高了24.6%和9.2%。通过扫描电子显微镜分析发现,双金属合金之间形成了良好的冶金焊合界面,挤压过程中2024和5XXX合金微观组织均产生大小晶粒交错的双峰结构。The composite tubes with 2024 aluminum alloy as sleeve and 5A02 and 5A06 as core tube respectively were prepared by indirect extrusion method.The mechanical properties and microstructure of the two types of composite tubes were explored.The results show that such bimetallic composite tubes exhibite good strength and plasticity after solution treatment.After solution treatment at 495℃/40 min,the plasticity of 2024/5A06 composite tubes is significantly enhanced,with elongation increased by 63.1% and tensile strength increased by 19.9% compared with the extruded monolithic 2024 alloy.Under the same process,the elongation and tensile strength of 2024/5A02 tube are 24.6% and 9.2% higher than those of the extruded monolithic 2024 alloy,respectively.Scanning electron microscopy(SEM)analysis shows that the well-formed metallurgical welding interface is formed between the bimetallic alloys.In the extrusion process,the microstructure of 2024 and 5XXX alloys shows the bimodal structure with staggered grains.

关 键 词：2024/5XXX复合管材 反向挤压 冶金结合 固溶强化 微观结构演变 

分 类 号：V214.6[航空宇航科学与技术—航空宇航推进理论与工程]