Numerical Modeling of Localized Deformation in Age Hardened Aluminum Alloys and Rare Earth Added Magnesium Alloys at Room and Elevated Temperatures

加拿大的汽车行业是该国最强大的制造业子行业，占国内生产总值（GDP）的12%。虽然用传统金属制造（即，钢铁）是一个成熟的领域，汽车工业正面临着与设计和开发节能车辆以减少温室气体排放（GHG）相关的重大挑战。轻金属，如铝和镁合金，是汽车制造商相当感兴趣的，但与碳钢相比，它们相对较低的可成形性提出了重大挑战。虽然它们有限的可成形性使它们无法用于某些结构部件，但先进的合金化和高温成形工艺使它们能够用于外部车身应用。拟议的研究将联合收割机结合微观力学，有限元方法，多尺度建模和超级计算领域的最新进展，最终目标是生产具有增强延展性的铝和镁合金，可用于增加车辆中使用的轻金属量。拟议研究项目的本构建模方面将主要集中在开发机制驱动的数值模型，在高温下时效硬化铝合金（AHAA）和稀土添加镁合金（RMg），以及微观力学为基础的公式在AHAA断裂。计算智能和有限元分析将是拟议研究在先进的数值模拟方面的主要推动力。拟议研究计划的结果将作为汽车行业材料科学家和工程师的指南，清楚地展示铝和镁合金实现改进的可成形性所需的微观结构和机械性能。

Canada's automotive industry is the strongest manufacturing subsector in the country, and is responsible for 12% of Gross Domestic Product (GDP) in the goods-producing sector. While manufacturing with traditional metals (i.e., steels) is a well-established field, the automotive industry is facing major challenges associated with the design and development of fuel-efficient vehicles for reducing greenhouse gas emissions (GHGs). Light metals, such as aluminum and magnesium alloys, are of considerable interest to automobile manufacturers, but their relatively low formability compared to carbon steels presents a significant challenge. While their limited formability prevents them from being used in certain structural parts, advanced alloying and elevated temperature forming processes enable them to be used for outer body applications. The proposed research will combine the latest advancements in the fields of micromechanics, finite element methods, multi-scale modelling, and super computing, towards the ultimate goal of producing aluminum and magnesium alloys with enhanced ductility, that can be used to increase the amount of light metals employed in a vehicle. The constitutive modelling aspects of the proposed research project will mainly focus on developing mechanism driven numerical models at elevated temperatures for Age Hardened Aluminum Alloys (AHAA) and Rare Earth Added Magnesium Alloys (RMg) as well as a micromechanics based formulation for fracture in AHAA. Computational intelligence and finite element analyses will be the main thrust of the proposed research in terms of advanced numerical modelling. Outcomes of the proposed research program will serve as a guide for both material scientists and engineers in the automotive industry by clearly demonstrate the microstructural and mechanical properties necessary in aluminum and magnesium alloys to achieve improved formability.