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: $ 2.4万
• 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: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=712430
• 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.

拟议研究的广泛目的是对在纯MG和选定的MG合金塑料变形过程中产生的晶格缺陷的特性发展基本理解，以及这些缺陷对机械和电子传输特性的影响。这些知识对于在设计和制造具有卓越特性的不同应用中的低成本MG合金的设计和制造中是必要的。所提出的计划的目标针对的是，在MG和MG合金中的结构 - 主体关系的各个方面，要求有良好的理解，但从未被研究过，或者从未被研究过或没有得到充分解决。 其中包括： （i）了解晶格缺陷的结构和特性，这些晶格缺陷是通过变形双胞胎遗传的，在双胞胎过程中形成了父，以及将各种晶格缺陷纳入双晶格的机制。这项研究将允许理解变形双胞胎在塑性和断裂中的作用，以及双胞胎对Mg和Mg合金物理特性的影响。 （ii）理解将指导设计过程的设计原理，以开发优化的缺陷体系结构，从而提供了强度和延展性的优势组合。 （iii）在存在晶格缺陷和溶质原子的情况下，了解电子传输，应用磁场对电子传输的影响以及宏观流动应力与电导率之间的关系。 这些目标将通过采用实验方法和理论研究来实现。这项研究将使对晶体缺陷的原子结构和特性有更好的基本了解，存在缺陷的情况以及它们对MG合金功能性能的影响。该程序突出了变形孪晶与机械和电磁特性之间的联系，因为这些知识缺少，但是对于设计合金组成和实现合金出色功能性能的处理路径至关重要。上面的前两个目标的进展将为MG合金的开发和微观结构设计提供指导，并具有出色的机械性能，用于飞机和太空行业，军事空气系统，直升机和汽车行业的应用。在存在晶格缺陷的情况下，对电子传输的理解将有助于指导民用空气和军事空间系统中电子工业基于MG的材料的开发，在该系统中，电磁干扰屏蔽和辐射保护需要轻巧，强和耐用的材料。在拟议计划过程中将开发的基本知识可将其转移到其他HCP工程合金上。