GOALI: Defect Detection Microscopy: Microstructure Design for Formability of Wrought Magnesium Alloys

目标：缺陷检测显微镜：变形镁合金成形性的微观结构设计

• 批准号: 0928923
• 负责人: David Fullwood
• 金额: $ 31.99万
• 依托单位: Brigham Young University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0928923&HistoricalAwards=false
• 关键词: GOALI; Defect; Detection; Microscopy; Microstructure

This research project will build a framework for the design and manufacture of metal microstructures containing fewer damage-sensitive features, with subsequent improved ductility and formability. An enabling technology, Defect Detection Microscopy (DDM), will be developed in order to detect large numbers of defect sites in deformed polycrystalline materials in reasonable experimental times. Structure parameters (recovered via DDM) in the regions of critical defects will be correlated with defect type to determine robust Failure Initiation Parameters (FIPs). Once these correlations are known, an inverse approach, already developed for microstructure sensitive design of defect insensitive elastic and plastic properties, will be applied to the framework to improve defect-sensitive properties. This work will be undertaken in collaboration with General Motors Research Laboratory, and will focus on improved ductility and formability of magnesium for the manufacture of lightweight automotive structures. The introduction of lightweight materials into the US auto industry is a key national objective that will benefit significantly from this work. Current production methods for fabricating magnesium autobody panels require high temperature processing, preventing the use of magnesium as a viable lightweight alloy for high-volume automobile production. If the aims of this project are met, DDM will not only open the way for cost effective, low temperature, application of magnesium to improve vehicle fuel efficiency in the auto industry, but will also serve as an enabling technology in the study and development of a much broader range of damage-sensitive material applications (such as toughness and fatigue) critical to US industry in general. The proposed interdisciplinary activity also brings together expertise from several traditional fields including mechanical engineering, manufacturing science, engineering design, materials science, and applied mathematics. This will have a significant impact on the development of skilled human resources in emerging science and advanced technology fields.

该研究项目将建立一个框架，用于设计和制造包含较少损伤敏感特征的金属微观结构，随后提高了延展性和可表现性。为了在合理的实验时期，将开发一种启示技术，缺陷检测显微镜（DDM），以检测变形多晶材料中的大量缺陷位点。在关键缺陷区域中的结构参数（通过DDM恢复）将与缺陷类型相关，以确定可靠的故障启动参数（FIPS）。一旦已知这些相关性，就已经开发出一种用于缺陷弹性和塑料特性的微观结构敏感设计的反向方法，将应用于框架以改善缺陷敏感性。这项工作将与通用汽车研究实验室合作进行，并将着重于改善镁的延展性和形成性，以制造轻型汽车结构。将轻质材料引入美国汽车行业是一个关键的国家目标，将从这项工作中受益匪浅。当前用于制造镁自动化型面板的生产方法需要高温加工，从而阻止将镁用作可行的轻质合金用于大容量的汽车生产。如果满足了该项目的目标，DDM不仅将为具有成本效益，低温，镁应用以提高汽车行业的车辆燃油效率开辟道路，而且还将作为一项更广泛的损害敏感材料应用（例如韧性和疲劳）的研究和开发，在研究和开发方面是一种促成技术。拟议的跨学科活动还汇集了几个传统领域的专业知识，包括机械工程，制造科学，工程设计，材料科学和应用数学。这将对新兴科学和先进技术领域的熟练人力资源的发展产生重大影响。