点阵强变形轧制镁/铝层合板波纹结合界面的形成

Formation of corrugated bonding interface for Mg/Al laminate by lattice severe deformation rolling

点阵强变形轧制(LSDR)原理对解决镁/铝层合板轧制过程中存在的结合强度低、翘曲和边裂严重等技术问题有明显优势,然而关于波纹结合界面的形成机理及特征尚缺少研究。通过有限元数值模拟分析了LSDR原理轧制下波纹辊对层合板的强非均匀变形作用,解释了波纹结合界面的形成特点和沿界面应变的分布规律,并通过轧制实验进行了验证。结果表明:LSDR原理轧制镁/铝层合板时,组元板尤其是镁合金板沿轧向(RD)和横向(TD)均经历了两次周期性变形,促使结合界面处沿两方向形成波纹状结构,且沿RD的波纹周期略大,沿TD的波纹周期略小。沿RD和TD的波纹结合界面形成特点和形态的不同,导致两方向的金属间化合物层分布与力学性能存在差异。研究内容为深入探索LSDR原理及制备高性能的镁/铝层合板提供了实验参考。

Lattice severe deformation rolling(LSDR)principle has obvious advantages in solving technical problems such as low bonding strength,warping and severe edge cracking in Mg/Al laminate rolling process,however,the formation mechanism and characteristics of corrugated bonding interface are still understudied.Therefore,the severe non-uniform deformation effect of corrugated roll on the laminate rolled under LSDR principle was analyzed by finite element numerical simulation,and the formation characteristics of corrugated bonding interface and the distribution laws of strain along the interface were explained,which were verified by rolling experiment.The results show that when the Mg/Al laminate is rolled by the LSDR principle,the component plate,especially the Mg alloy plate,undergoes two periodic deformations along the rolling direction(RD)and the transverse direction(TD),which promotes the formation of corrugated structure in the bonding interface along two directions,and the corrugated period is slightly larger along RD and is slightly smaller along TD.The difference in the formation characteristics and morphologies of corrugated bonding interface along RD and TD leads to the difference in the distributions and mechanical properties of intermetallic compound layer along two directions.Thus,the research content provides the experimental reference for the in-depth exploration of LSDR principle and the preparation of high-performance Mg/Al laminates.