GOALI/Collaborative Research: Immiscible Phase Interface-Driven Processing of Ultrafine-Laminated Structures for Lightweight and Strong Magnesium-Based Sheets

镁是最轻、无害的结构金属，其合金在航空航天和汽车工业中具有实现能源效率的巨大潜力。然而，镁合金通常缺乏强度和成型性，克服这些缺点的传统途径不足且成本高昂。由一种镁合金相和另一种明显不同的金属相组成的两相叠层材料具有克服这些挑战的潜力。GOALI学术联络机会(GOALI)奖通过首先了解镁合金材料在外加载荷下变形的机制，支持实现制造镁合金的第一个两相精细叠层结构的工艺突破所需的基础科学研究。为该项目提供动力的一个关键因素是使用了一种名为镁500的新型镁合金，这种合金不含稀土元素，铝含量非常低，使其成为许多应用的极佳候选者。超高密度的镁500/Nb界面将允许多种功能，这是迄今为止镁基材料所不能实现的。了解这些材料体系的变形将对下一代汽车和航空航天应用的轻质结构材料做出重要贡献。此外，该研究项目将为学生提供极好的教育机会，并在学术和工业环境中为下一代科学家和工程师提供培训。从这项工作中获得的新知识将通过软件、教程和用于数据分发的云应用程序广泛传播。该研究计划的科学目标是促进对六角密堆积(HCP)/体心立方(BCC)界面如何控制新型超细层状金属复合材料中的滑移和孪生的理解，从而从根本上提高强度和成形性。这是一个合作项目，加入了加州大学圣巴巴拉分校、新汉普郡大学和工业合作伙伴NanMAG，LLC。这些研究活动是在假设hcp/bcc界面可以阻止宏观不稳定性并促进均匀变形和成形性的前提下进行的。该大学和产业界团队将共同实施一项集成的实验和建模策略，以了解Mg500/Nb(HCP/BCC)界面如何控制塑性过程，从而使高强度(1 GPA)镁基板能够均匀变形到中等应变(5%)。这一理解将被整合到一个预测性的多尺度、界面敏感的模型中，用于将加工过程中的微观组织演变与机械性能联系起来。

Magnesium (Mg) is the lightest non-hazardous structural metal, and its alloys have tremendous potential for achieving energy efficiency in the aerospace and automotive industries. Magnesium alloys often lack strength and formability, however, and traditional pathways for overcoming these drawbacks are insufficient and costly. Two-phase laminated materials, consisting of an Mg alloy phase and another distinctly dissimilar metal phase, have the potential to overcome these challenges. This Grant Opportunities for Academic Liaison with Industry (GOALI) award supports fundamental scientific research needed to achieve the processing breakthrough of making the first two-phase, finely laminated structures of Mg alloys, by first understanding the mechanisms by which these materials deform under applied load. One key element that fuels this project is the use of a new Mg alloy, called Mg500, which does not contain rare earth elements, and has very low aluminum content, making it an excellent candidate for many applications. The extraordinarily high density of Mg500/Niobium interfaces will permit multiple functions not possible in Mg-based materials to date. Understanding the deformation of these materials systems will make a critical contribution to the next generation of lightweight structural materials for automotive and aerospace applications. In addition, this research program will provide excellent educational opportunities for students, and training for the next generation of scientists and engineers in both academic and industrial settings. The new knowledge derived from this work will be disseminated broadly though software, tutorials and cloud-based Apps for data distribution.The scientific goals of this research program are to advance understanding on how hexagonal close-packed (HCP)/body-centered cubic (BCC) interfaces can control slip and twinning in novel ultra-fine laminated metallic composites and, as a result, radically enhance strength and formability. It is a cooperative program that joins the University of California at Santa Barbara, the University of New Hampshire, and the industrial partner, nanoMAG, LLC. The research activities are driven by hypotheses that HCP/BCC interfaces can thwart macroscopic instabilities and promote uniform deformation and formability. Together this university-industry team will carry out an integrated experimental and modeling strategy to understand how Mg500/Nb (HCP/BCC) interfaces can control plasticity processes, enabling homogeneous deformation of high-strength (1 GPa) Mg-based sheets to moderate strains ( 5%). This understanding will be integrated into a predictive multi-scale, interface-sensitive model for linking microstructural evolution during processing with mechanical performance.