稀土镁合金超塑性和加中间层扩散连接工艺研究  

Research on Process of Super Plasticity and Diffusion Bonding with Interlayer of Rare Earth Magnesium Alloy

作　　者：许慧元 芦博昕 武永 王斌 郭成龙 XU Huiyuan;LU Boxin;WU Yong;WANG Bin;GUO Chenglong(AVIC Manufacturing Technology Institute,Beijing 100024,China;Nanjing University of Aeronautics Astronautics,Nanjing 210016,China;Beijing Xinghang Mechanical-Electric Equipment Co.,Ltd.,Beijing 100072,China)

机构地区：[1]中国航空制造技术研究院,北京100024 [2]南京航空航天大学,南京210016 [3]北京星航机电装备有限公司,北京100072

出　　处：《新技术新工艺》2025年第1期70-75,共6页New Technology & New Process

摘　　要：稀土镁合金因其优异的力学性能和轻质特点,在航空航天、汽车制造、生物医学等领域具有广泛的应用前景。然而,其塑性变形能力较差,限制了其成形复杂形状的能力。通过研究稀土镁合金的超塑变形行为和加中间层扩散连接工艺,获得稀土镁合金的超塑成形和扩散连接工艺参数,对比了不同试验状态下扩散界面焊合率和界面剪切强度,分析了扩散界面的扩散行为和组织变化及剪切断裂行为,并通过典型SPF/DB两层结构成形工艺试验件成形对工艺可行性进行验证。结果表明:480℃、应变速率0.0001 s^(-1)条件下获得最大延伸率378%。在480℃、扩散压力2 MPa、保压2 h条件下,采用Cu中间层扩散连接可以实现100%的扩散焊合率,界面剪切强度最高达到108 MPa,相同条件下无中间层扩散连接的焊合率小于10%。中间层与稀土镁合金之间发生了元素互扩散,过渡区有相变和相长大现象。采用Cu中间层扩散连接和超塑成形工艺可以实现典型SPF/DB两层结构成形。The rare earth magnesium alloy had wide application prospects in aerospace,automotive manufacturing,biomedicine and other fields because of its excellent mechanical properties and light weight.However,its poor plastic deformation ability limited its ability to form complex shapes.The superplastic forming and diffusion bonding process parameters of rare earth magnesium alloys were obtained by studying the superplastic deformation behavior and diffusion bonding process with interlayer.It was compared that the diffusion interface bonding rate and interfacial shear strength under different test conditions,the diffusion behavior,structural change and shear fracture behavior of the diffusion interface were analyzed,and the feasibility of the process was verified by the typical SPF/DB two-layer forming process.The results showed that the maximum elongation of 378%was obtained at 480℃and strain rate of 0.0001 s^(-1).Under the condition of 480℃,2 MPa diffusion pressure and 2 hours holding time,the bonding rate of Cu interlayer diffusion bonding could almost be 100%,and the interface shear strength could reach 108 MPa.The bonding rate without interlayer was less than 10%under the same conditions.The inter diffusion of elements occurred between the interlayer and the rare earth magnesium alloy,and the phase transition and phase growth occurred in the transition zone.The typical SPF/DB two-layer structure could be formed by Cu interlayer diffusion bonding and super plastic forming.

关 键 词：稀土镁合金 超塑成形 中间层 扩散连接 界面性能 SPF/DB 

分 类 号：TG146[一般工业技术—材料科学与工程]