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

拟议的研究的广泛目标是发展的纯镁和选定的镁合金的塑性变形过程中产生的晶格缺陷的性质和这些缺陷对机械和电子传输性能的影响的基本理解。这些知识对于开发具有不同应用上级性能的低成本镁合金的设计和制造创新解决方案是必要的。该计划的目标是针对镁和镁合金的结构-性能关系方面，这些方面需要很好的理解，但以前从未研究过或没有得到充分的解决。其中包括：（i）了解在孪生过程中，形变孪晶从母体中继承的晶格缺陷的结构和性质，以及各种晶格缺陷融入孪晶晶格的机制。研究结果将有助于理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)理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上级组合。(iii)理解晶格缺陷和溶质原子存在下的电子输运，外加磁场对电子输运的影响，宏观流动应力与电导率之间的关系，通过实验方法和理论研究来实现目标。该研究将允许获得更好的基本了解晶体缺陷的原子结构和性质，缺陷存在下的电子输运的性质，以及它们对镁合金功能特性的影响。该计划强调了变形孪晶与机械和电磁性能之间的联系，因为这方面的知识是缺失的，但它在设计合金成分和实现合金上级功能特性的加工路径中至关重要。前两个目标的研究进展将为飞机和航天工业、军用航空系统、直升机和汽车工业等领域中具有上级力学性能的镁合金的开发和组织设计提供指导。对晶格缺陷下电子输运的理解将有助于指导民用航空和军用航天系统中电子工业用镁基材料的开发，这些系统需要轻质，坚固和耐用的材料用于电磁干扰屏蔽和辐射防护。基础知识，将在拟议计划的过程中开发是转移到其他HCP工程合金。

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.