Reduction of anisotropic material properties during extrusion through additively manufactured extrusion dies

通过增材制造的挤出模具在挤出过程中降低各向异性材料特性

• 批准号: 455039650
• 负责人: Professor Dr.-Ing. Noomane Ben Khalifa
• 金额: --
• 依托单位: Institut für Werkstoffforschung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/455039650?language=en
• 关键词: Reduction; anisotropic; material; properties; during

The proposed project deals with the development of the anisotropic mechanical behavior of metallic profiles during the extrusion of profiles and with concepts to influence and balance this behavior. The development of anisotropic properties during extrusion is revealed for different types of materials, especially aluminium and magnesium. However, it can vary in quantity depending on the alloys and geometries. A new approach is suggested to control the material flow in the extrusion die in a way that the anisotropy of the mechanical properties is specifically and measurably influenced and reduced. The possibility of controlling the material flow is realized by a novel design of extrusion dies and its production using additive manufacturing technology. Then geometries can be represented which cannot be achieved using conventional manufacturing processes.The mechanical properties of the materials are specifically influenced by the directional material flow and the associated microstructure development. On the crystallographic level, this deformation produces distinct textures, therefore causing anisotropic mechanical properties of the extruded profile due to the directionality of activated deformation mechanisms. The targeted adaptation of the material flow in the die and the resulting change in the stress and strain states during forming can thus be described and controlled. This makes it possible to define design guidelines for the microstructure development required for the targeted reduction of the anisotropic mechanical behavior of the extruded profiles.

拟议的项目涉及型材挤压过程中金属型材的各向异性力学行为的发展，以及影响和平衡这种行为的概念。不同类型的材料，特别是铝和镁，在挤压过程中的各向异性性能的发展。然而，它可以根据合金和几何形状在数量上变化。提出了一种新的方法来控制挤出模头中的材料流动，使机械性能的各向异性受到具体和可测量的影响和降低。控制材料流动的可能性是通过挤压模具的新设计及其使用增材制造技术的生产实现的。这样就可以表现出传统制造工艺无法实现的几何形状。材料的机械性能受到材料定向流动和相关微观结构发展的特别影响。在晶体学水平上，这种变形产生不同的纹理，因此由于激活的变形机制的方向性而导致挤出型材的各向异性机械性能。因此，可以描述和控制模具中材料流动的目标适应以及在成形期间应力和应变状态的结果变化。这使得有可能为微观结构的发展定义设计指导方针，这些微观结构的发展是有针对性地减少挤压型材的各向异性机械行为所需的。