Enhanced strength and ductility of wrought magnesium alloys through alloying with rare earth elements

通过稀土元素合金化增强变形镁合金的强度和延展性

• 批准号: 185142761
• 负责人: Dr.-Ing. Talal Al-Samman
• 金额: --
• 依托单位: Institut für Metallkunde und Metallphysik (IMM)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/185142761?language=en
• 关键词: Enhanced; strength; ductility; wrought; magnesium

The challenges of today's advanced world are enforcing a strong demand for light alloys based for e.g. on magnesium to be used in transportation. Despite many attractive properties the applications of wrought magnesium alloys is still limited due to insufficient low temperature formability, which is directly attributed to an inadequate texture and microstructure development during thermomechanical processing. By contrast to typical wrought Mg alloys (e.g. AZ31, ZK60) which develop sharp deformation textures associated with strong mechanical anisotropy, rare earth (RE)-containing Mg alloys develop much weaker and less common textures that contribute to the enhancement of ambient formability and the reduction of the mechanical anisotropy. Although the effect of RE additions on randomizing the texture has been reported, the mechanisms of the observed texture modification are still not conclusively understood. The objective of this project is to conduct comprehensive investigations of deformation and recrystallization of Mg-RE alloys that will shed a new light on design strategies of Mg wrought alloys with optimized strength and ductility. The main focus is set on investigating single RE additions and exploiting their influence on the deformation characteristics, the recrystallization mechanisms, and the corresponding texture development. By identifying the controlling mechanisms, we should be able to derive a concept for microstructure and texture engineering for optimized mechanical properties.

当今先进世界的挑战是对用于运输的基于例如镁的轻合金的强烈需求。尽管变形镁合金具有许多诱人的性能，但由于低温成形性不足，其应用仍然受到限制，这直接归因于热机械加工过程中织构和显微组织发展不足。与形成与强机械各向异性相关联的尖锐变形织构的典型锻造镁合金（例如AZ31、ZK60）相比，含稀土（RE）的镁合金形成弱得多且不太常见的织构，这有助于环境可成形性的增强和机械各向异性的降低。虽然已经报道了RE添加对随机化织构的影响，但是所观察到的织构改性的机制仍然没有得到最终的理解。该项目的目标是对镁稀土合金的变形和再结晶进行全面研究，这将为具有优化强度和延展性的变形镁合金的设计策略提供新的见解。主要的焦点是设置在调查单一的RE添加剂和利用其对变形特性，再结晶机制，和相应的织构发展的影响。通过识别控制机制，我们应该能够得到一个概念，为优化机械性能的微观结构和织构工程。

项目成果

Twinning effects in deformed and annealed magnesium–neodymium alloys

• DOI: 10.1016/j.msea.2015.08.090
• 发表时间: 2015-10
• 期刊: Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
• 影响因子: 6.4
• 作者: Carsten Drouven;I. Basu;T. Al-Samman;S. Korte-Kerzel

Triggering rare earth texture modification in magnesium alloys by addition of zinc and zirconium

• DOI: 10.1016/j.actamat.2013.12.015
• 发表时间: 2014-04-01
• 期刊: ACTA MATERIALIA
• 影响因子: 9.4
• 作者: Basu, I.;Al-Samman, T.
• 通讯作者: Al-Samman, T.

Determination of grain boundary mobility during recrystallization by statistical evaluation of electron backscatter diffraction measurements

• DOI: 10.1016/j.matchar.2016.04.024
• 发表时间: 2016-07-01
• 期刊: MATERIALS CHARACTERIZATION
• 影响因子: 4.7
• 作者: Basu, I.;Chen, M.;Molodov, D. A.
• 通讯作者: Molodov, D. A.

Twin recrystallization mechanisms in magnesium-rare earth alloys

• DOI: 10.1016/j.actamat.2015.05.044
• 发表时间: 2015-09-01
• 期刊: ACTA MATERIALIA
• 影响因子: 9.4
• 作者: Basu, I.;Al-Samman, T.
• 通讯作者: Al-Samman, T.