Reduction of anisotropy and the SDE of magnesium profiles by means of a specific process control of the extrusion process

通过挤压过程的特定过程控制减少镁型材的各向异性和 SDE

基本信息

项目摘要

The increasing demand for innovative lightweight construction requires the use of magnesium as a construction material. By means of different alloying elements and manufacturing processes the mechanical properties of magnesium could be steadily increased. Especially the increase of the mechanical properties of magnesium by the treatment with severe plastic deformation is to be emphasized. However, after extrusion or rolling due to its hexagonal lattice structure and the necessity of twinning to deformation, magnesium shows distinctions in yield stress according to compressive or tension (Strength Differential Effect, SDE) as well as the direction of loading in relation to the extrusion and rolling direction respectively (anisotropy). Since in reality multiaxial stress conditions predominantly occur, the SDE and the anisotropy represent a disadvantage of magnesium. In order to increase the range of application of magnesium alloys as a construction material basic knowledge of manipulation of SDE and anisotropy are of great importance. In this project the microstructure and finally the mechanical properties should be manipulated by an innovative process control, on the one hand by an increase in the shear stress components, on the other hand by an elevation in the compressive stress components. Thereby the shear stress component is constructively elevated by integration of ECAP deformation and by pre-chambers in the original press die. The compressive stress component is enhanced by the pre-treatment of the billet by means of forging before extrusion.
对创新的轻质建筑的需求日益增长,需要使用镁作为建筑材料。通过不同的合金化元素和制造工艺,可以稳定地提高镁合金的力学性能。特别是镁合金经过大塑性变形处理后,力学性能的提高值得重视。然而,镁在挤压或轧制后,由于其六方晶格结构和孪生变形的必要性,在屈服应力方面表现出不同的压缩或拉伸(强度差效应,SDE)以及载荷方向与挤压和轧制方向的不同(各向异性)。因为在现实中主要发生多轴应力条件,所以SDE和各向异性是镁的劣势。为了扩大镁合金作为建筑材料的应用范围,掌握SDE和各向异性的基本知识是非常重要的。在这个项目中,微观结构和最终的机械性能应该通过创新的工艺控制来控制,一方面通过增加剪应力分量,另一方面通过提高压应力分量。因此,通过ECAP变形的积分和原始冲模中的预腔,剪应力分量被结构性地提高。通过挤压前锻造对坯料进行预处理,提高了压应力分量。

项目成果

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Privatdozent Dr.-Ing. Sören Müller其他文献

Privatdozent Dr.-Ing. Sören Müller的其他文献

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{{ truncateString('Privatdozent Dr.-Ing. Sören Müller', 18)}}的其他基金

Indirect extrusion of Cu/Al composite profiles
铜/铝复合型材的间接挤压
  • 批准号:
    317009191
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Experimental and analytical investigations of extrusion seams in magnesium hollow profiles
镁空心型材挤压缝的实验和分析研究
  • 批准号:
    232117021
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Extrusion of hollow profiles with tailored wall thicknesses
具有定制壁厚的空心型材的挤压
  • 批准号:
    201590891
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Extrusion of thin flat Magnesium profiles and characterization of the forming properties
薄扁平镁型材的挤压及其成形性能表征
  • 批准号:
    202347175
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Strangpressen dünner Flachprofile aus Magnesiumlegierungen und Eigenschaften der Pressprodukte
镁合金薄扁平型材的挤压及压制产品的性能
  • 批准号:
    76448989
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Simulation des Materialflusses in der Kammermatrize beim Strangpressen hybrider Mg-Al-Hohlprofile
混合镁铝空心型材挤压过程中腔模内材料流动的模拟
  • 批准号:
    98713167
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Aluminum-copper bond wires for power electronic modules
电力电子模块用铝铜键合线
  • 批准号:
    440974394
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants (Transfer Project)

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