Effect of shear strain on metal deformation and microstructural evolution

剪切应变对金属变形和微观结构演变的影响

• 批准号: 1817753
• 金额: --
• 依托单位: Swansea University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1817753
• 关键词: Effect; shear; strain; metal; deformation

The aim of this project is to perform sole shear deformation (i.e., without axial strain components) of metals and determine the effect of shear strain on deformation mechanisms, microstructure and texture evolution and develop novel processing procedures to tailor the microstructure and texture of metallic materials for various structural applications. This research will exploit state of the art advanced microscopy and CoE mechanical testing units in Swansea, the central neutron diffraction facility (ISIS, Didcot) and Crystal plasticity finite element modelling (CPFEM) to develop a mechanistic understanding.Methodology: The metals having very different crystal structures, Ti, Zr and Mg (hcp), Al (fcc) and Nb are selected for this research due to their industrial relevance. The start of this research will focus on implementing a Groove Press compatible with the CoE loading machines to perform sole shear deformation. For a mechanistic understanding, specimens from different stages of deformation and recrystallization will be analysed using a range of microscopy facilities, optical, SEM, TEM and EBSD, available in Swansea. In-situ studies at Engin-X, ISIS, will provide details of representative lattice strain evolution of different grain families and allows insights into the activity of different deformation modes. These quantities can also be inputs for CPFEM for better understanding of the deformation mechanisms. CPFEM will also be employed to predict texture and lattice strain evolution.

该项目的目的是进行金属的单一剪切变形（即，没有轴向应变成分），并确定剪切应变对变形机制，微观结构和纹理演变的影响，并开发新的加工程序，以定制各种结构应用的金属材料的微观结构和纹理。这项研究将利用斯旺西先进的显微镜和CoE机械测试单元，中心中子衍射设施（ISIS, Didcot）和晶体塑性有限元建模（CPFEM）来开发一个机制的理解。方法：由于其工业相关性，本研究选择具有非常不同晶体结构的金属Ti， Zr和Mg (hcp), Al （fcc）和Nb。这项研究的开始将集中在实现与CoE加载机兼容的槽压力机来执行鞋底剪切变形。对于机械的理解，从变形和再结晶的不同阶段的标本将使用一系列显微镜设备，光学，SEM， TEM和EBSD进行分析，可在斯旺西。在ISIS的engine - x上进行的原位研究将提供不同晶粒族的代表性晶格应变演化的细节，并允许深入了解不同变形模式的活动。这些量也可以作为CPFEM的输入，以便更好地理解变形机制。CPFEM还将用于预测织构和晶格应变演化。