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In situ diffraction analysis using high energy synchrotron radiation to investigate the influence of active deformation and recrystallisation mechanisms on the microstructural development of new magnesium sheet alloys

使用高能同步辐射进行原位衍射分析，研究主动变形和再结晶机制对新型镁板合金微观结构发展的影响

基本信息

批准号：
262840495
负责人：
Dr. Jan Bohlen
金额：
--
依托单位：
Institut für Werkstoffkunde und Werkstofftechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/262840495?language=en
关键词：
situ diffraction analysis using energy

项目摘要

The formation of microstructure and texture during a rolling process determines the properties of magnesium sheets and their technical potential for lightweight application. Weakening the texture or changing the main texture components as well as grain refinement, result in distinctly increased formability of the sheets. However, such textures lead to enhanced mechanical anisotropy. A high number of individual mechanisms is currently discussed regarding their impact on the microstructure and texture development. Although the analysis reveals altered activation of different deformation mechanisms as well as effects on the recrystallization behaviour during the rolling process, the effect of added rare earth elements or calcium in ternary magnesium alloys on these mechanisms as well as the impact on the microstructure and texture development is not well understood. The aim of this project is to apply in-situ hard X-rays diffraction experiments using synchrotron radiation in order to draw direct conclusions about the influence of individual deformation and recrystallisation mechanisms on the microstructure and texture evolution during deformation of magnesium sheet alloys. The in-situ measurement method at the synchrotron beam allows a time-resolved description of the defect and texture development in a constant sample volume during well-defined thermo-mechanical treatments, which offers an excellent experimental basis for the analysis of the mechanisms of the microstructure changes. Concurrent to this approach micro-mechanisms are examined on a grain scale (micrometre or nanometre scale) using electron microscopy, e.g. SEM-EBSD and TEM. The influence of alloying elements, particularly rare earth elements or similar-acting elements as well as the effect of a thermo-mechanical treatment on the activation of deformation mechanisms and recrystallisation is examined in a combined approach. Understanding single mechanisms and their competitive contribution on the resulting microstructure, texture development and mechanical properties allows the relative significance of such mechanisms to be derived. Furthermore, the results allow a metal physical based control of the texture development during rolling of magnesium sheets.

轧制过程中微观组织和织构的形成决定了镁合金板材的性能及其轻量化应用的技术潜力。弱化织构或改变主要织构成分以及晶粒细化，可显著提高板材的成形性。然而，这样的纹理导致增强的机械各向异性。目前正在讨论大量单独的机制对微观结构和纹理发展的影响。虽然分析揭示了不同的变形机制的激活以及在轧制过程中的再结晶行为的影响，在三元镁合金中添加稀土元素或钙对这些机制的影响以及对微观结构和织构发展的影响还没有很好地理解。本项目的目的是应用同步辐射的原位硬X射线衍射实验，以得出直接的结论的影响，个别变形和再结晶机制的微观结构和织构的演变在变形过程中的镁合金板材。在同步加速器光束的原位测量方法允许在一个恒定的样品体积在定义良好的热机械处理过程中的缺陷和织构发展的时间分辨的描述，这提供了一个很好的实验基础的微观结构变化的机制的分析。与此同时，使用电子显微镜（例如SEM-EBSD和TEM）在颗粒尺度（微米或纳米尺度）上检查微观机制。合金元素，特别是稀土元素或类似作用的元素，以及热机械处理的变形机制和再结晶的激活的效果的影响，检查在一个组合的方法。了解单一的机制和它们的竞争对所得的微观结构，织构发展和力学性能的贡献允许这些机制的相对意义来推导。此外，该结果允许基于金属物理的控制在镁片材的乳制期间的织构发展。