Design and multiscale characterization of new metallic systems with hierarchical microstructural heterogeneity

具有分层微观结构异质性的新型金属系统的设计和多尺度表征

• 批准号: RGPIN-2019-05834
• 负责人: Deng, Chuang
• 金额: $ 2.04万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=682218
• 关键词: Design; multiscale; characterization; new; metallic

Next-generation structural and protective materials are needed for the aerospace and automobile industries, which combine low weight, high strength, high hardness, and high toughness. However, it is difficult to achieve these properties simultaneously and at low cost in engineering materials, because conventional engineering materials usually face an intrinsic tradeoff between strength and ductility. ******This research is guided by the idea that a material's structure determines its properties and that microscopic interfacial defects (such as grain boundaries and phase boundaries) essentially govern the mechanical response and microstructural evolution of almost any known metals and metal alloys. As such, this research aims to improve existing engineering materials in both strength and ductility while maintaining their density (weight) by tailoring the microstructures at interfacial defects. For this purpose, a program involving both computational modeling and experimental characterization is proposed for this Discovery Grant. Specifically, atomistic modeling tools will be employed to reveal the fundamental thermodynamics and kinetics of various interfacial defects. Moreover, I will use computational modeling to guide the synthesis and characterization of materials with different types of interfacial defects. This will allow us to develop superior metals for use in the aerospace or automobile industry that are stronger and lighter than what is currently available. ******Manufacturing is of strategic importance to the Canada economy and metallic materials are the core of manufacturing. This research can thus potentially benefit the Canada economy by making next-generation materials that are lighter, stronger, and tougher at a low cost based on the most commonly used, existing metallic systems in the industry such as Cu, Ni, and Al. Through this program, I will train four HQPs who will acquire unique computational and experimental skills that are highly demanded in both academia and the manufacturing industry of Canada. ********

航空航天和汽车工业需要结合轻质、高强度、高硬度和高韧性的下一代结构和防护材料。然而，在工程材料中很难以低成本同时实现这些性能，因为传统的工程材料通常面临强度和延展性之间的内在权衡。 ******这项研究的指导思想是，材料的结构决定其性能，而微观界面缺陷（例如晶界和相界）本质上控制着几乎所有已知金属和金属合金的机械响应和微观结构演化。因此，本研究旨在通过定制界面缺陷处的微观结构来提高现有工程材料的强度和延展性，同时保持其密度（重量）。为此，本次发现补助金提出了一项涉及计算建模和实验表征的计划。具体来说，将采用原子建模工具来揭示各种界面缺陷的基本热力学和动力学。此外，我将使用计算模型来指导具有不同类型界面缺陷的材料的合成和表征。这将使我们能够开发出用于航空航天或汽车工业的优质金属，这些金属比目前可用的金属更坚固、更轻。 ******制造业对加拿大经济具有战略重要性，金属材料是制造业的核心。因此，这项研究可以基于行业中最常用的现有金属系统（例如铜、镍和铝）以低成本制造更轻、更强、更坚韧的下一代材料，从而潜在地使加拿大经济受益。通过这个项目，我将培训四名总部人员，他们将获得加拿大学术界和制造业急需的独特计算和实验技能。 ******