Plasticity enhancement by engineered defect's architecture and concurrent electron-transport properties in Mg-based alloys.

通过设计缺陷的结构和镁基合金的并发电子传输特性来增强塑性。

• 批准号: RGPIN-2018-05926
• 负责人: Niewczas, Marek
• 金额: $ 4.81万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=758263
• 关键词: Plasticity; enhancement; engineered; defect; architecture

The broad aim of the proposed research is to develop a fundamental understanding of the properties of lattice defects produced during plastic deformation of pure Mg and selected Mg-alloys and the influence of these defects on mechanical and the electron-transport properties. This knowledge is necessary to develop innovative solutions in the design and fabrication of low-cost Mg-alloys with superior properties for different applications. The objectives of the proposed program target the aspects of the structure-property relationship in Mg and Mg alloys that demand a good understanding, but have never been studied before or have been addressed insufficiently. These include: (i) understanding the structure and properties of lattice defects, which are inherited by deformation twins form the parent during the twinning process and the mechanisms by which various lattice defects are incorporated into the twin lattice. The study will permit to understand the role of deformation twins in plasticity and fracture and the effect of twins on the physical properties of Mg and Mg alloys. (ii) understanding the principles that would guide the design of the fabrication process for the development of the optimized defect architecture, which delivers a superior combination of strength and ductility.(iii) understanding the electron-transport in the presence of lattice defects and solute atoms, the influence of applied magnetic field on the electron-transport and the relationship between macroscopic flow stress and electrical conductivity.The objectives will be achieved by employing experimental methods and theoretical studies. The research will allow gaining a better fundamental understanding of the atomic structure and properties of crystal defects, the nature of the electron transport in the presence of defects, and their influence on functional properties of Mg alloys. The program highlights the link between deformation twinning and the mechanical and galvanomagnetic properties because this knowledge is missing, but it is crucial in designing alloy composition and the processing path for achieving superior functional properties of the alloys. The progress in first two objectives above will provide guidance for the development and microstructural design of Mg alloys with superior mechanical properties for applications in aircraft and space industry, military air systems, helicopters and automotive industry. The understanding of electron transport in the presence of lattice defects will help to guide the development of Mg-based materials for the electronic industry in civil air and military space systems, where the lightweight, strong and durable materials are required for electromagnetic interference shielding and radiation protection. The fundamental knowledge that will be developed during the course of the proposed program is transferable onto other HCP engineering alloys.

本研究的主要目标是对纯镁和选定的镁合金塑性变形过程中产生的晶格缺陷的性质以及这些缺陷对机械和电子传输性能的影响有一个基本的了解。这些知识对于开发设计和制造低成本镁合金的创新解决方案是必要的，这些合金具有适合不同应用的优异性能。拟议计划的目标针对镁和镁合金的结构-性能关系方面，需要充分理解，但以前从未研究过或未得到充分解决。这些包括：（i）了解晶格缺陷的结构和性质，这些缺陷是在孪晶过程中由变形孪生从母体继承的，以及各种晶格缺陷并入孪晶晶格的机制。该研究将有助于了解变形孪晶在塑性和断裂中的作用以及孪晶对镁和镁合金物理性能的影响。 (ii) 了解指导制造工艺设计的原则，以开发优化的缺陷结构，从而提供强度和延展性的卓越组合。(iii) 了解存在晶格缺陷和溶质的情况下的电子传输原子、外加磁场对电子输运的影响以及宏观流动应力与电导率之间的关系。通过采用实验方法和理论研究来实现这些目标。该研究将使人们更好地了解晶体缺陷的原子结构和特性、缺陷存在下电子传输的性质及其对镁合金功能特性的影响。该计划强调了形变孪生与机械和电磁性能之间的联系，因为缺乏这方面的知识，但它对于设计合金成分和实现合金优异功能性能的加工路径至关重要。上述前两个目标的进展将为具有优异机械性能的镁合金的开发和微观结构设计提供指导，这些合金可用于飞机和航天工业、军用航空系统、直升机和汽车工业。对存在晶格缺陷的电子传输的理解将有助于指导民用航空和军用航天系统电子工业中镁基材料的开发，这些系统需要轻质、坚固和耐用的材料来屏蔽电磁干扰和辐射。保护。在拟议项目过程中开发的基础知识可以转移到其他 HCP 工程合金上。