挤压剪切制备铝/镁合金双层薄管的组织性能调控及复合机理研究

采用正挤压制备的铝/镁合金层状材料,可实现耐腐蚀轻量化的要求,但结合层强度较差,组织性能难以控制;项目提出挤压剪切制备双层薄管新技术,可实现双层管组织性能及外形质量的调控,特别是结合层物相组织性能优化;.以结合层的固相复合机理为核心科学问题进行研究,以AA6063铝合金和ZM21-1.5Y镁合金双层薄管的挤压剪切成形为研究对象,采用热模拟构建镁及铝合金理论模型,基于数值模拟及实验,在镁铝之间放置锌箔,结合扩散偶及热处理试验,采用EBSD及TEM等手段,构建双层薄管的外形质量-组织-强韧性-耐蚀性-参数之间的规律;探究双层薄管组织织构调控机理;探索双层薄管的强韧性,外形质量,耐蚀性随与组织,成形参数之间的内在联系;调控结合层组织及厚度,实现良好固相复合,提出双层薄管成形质量的评价及调控方法;.项目提出了制备高质量的双层薄管新途径,为挤压剪切技术在高性能层状材料的工程应用奠定基础。

The aluminum/magnesium alloy laminated material prepared by forward extrusion can meet the requirements of corrosion resistance and lightweight, but the microstructures and properties of the bonding layer are difficult to be controlled,and the bonding strength is low. In this project, The new technology of extruding and shearing is put forward in this project, which can control the microstructures,.properties and shape qualities of the double-layer thin walled tubes, especially optimize the microstructures and properties of the bonding layers.. The core scientific problem of this project is the solid-state composite mechanism of the aluminum-magnesium double-layer tube,and the extrusion-shear forming of double-layer tubes made of AA6063 aluminum alloy and ZM21-1.5Y magnesium alloy is the research object.The theoretical models of magnesium and aluminum alloy are set up by thermal simulations,and numerical simulations and experiments are based on,and zinc foils are placed between magnesium and aluminum alloys, and EBSD and TEM technologies are used in combination with diffusion couple and heat treatment tests.The rules between forming qualities,microstructures, physical fields and forming parameters of the double-layer thin walled tube are constructed, and the mechanisms of regulating the microstructures and textures of the double-layer thin walled tube are explored.The internal relations among shape qualitoes and microstructures and strengthening and toughening and corrosion resistance and process parameters of double-layer thin tubes are studied.The microstructures and thicknesses of the bonding layers are adjusted to achieve good solid-phase composite.The evaluation and control methods of forming qualities of double-layer thin walled tube are put forward.. A new way to prepare for high-quality double-layer thin walled tubes is proposed in this project, which lays a foundation for the application of extrusion-shear technology in the engineering of high-performance layered materials.