Materials World Network: Understanding the Microstructural Evolution and Deformation Behavior in Mg-Mn-RE Alloys

这项由马德里理工大学(UPM，西班牙)、IMDEA材料研究所(马德里，西班牙)和密歇根州立大学(MSU)合作进行的研究结合了实验和计算计划，以研究镁锰稀土(Mg-Mn-RE)合金在加工过程中的组织演变以及由于机械变形而发生的损伤形核和发展。进行微观结构表征是为了从结晶学的角度了解变形行为的细节如何与加工过程中的晶粒形核和长大以及在常温和高温拉伸和蠕变实验中的损伤形核相关联。在扫描电子显微镜内进行的原位拉伸和拉伸-蠕变实验能够识别初始损伤事件和变形过程以及变形演化。对实验表征的微结构的模拟提供了解释和分析定量实验数据的手段。定量地确定了引起损伤的变形过程的细节。这些细节为将损伤形核和变形演化信息引入微观结构模型提供了框架。开发的方法通过开发将微观结构响应与宏观结构性能联系起来的预测能力来集成材料和部件设计。这项工作旨在克服结构合金最具挑战性的方面之一，在保持延展性的同时提高环境和高温强度和蠕变抗力。这项工作的其他方面包括制作有关镁合金加工和表征的教育模块，扩大密歇根州立大学已有的K-12外展项目，以便通过远程操作扫描电子显微镜接触到更多美国和西班牙的K-12学生，为参与密歇根州立大学现有项目的本科生以及参与密歇根大学和芬欧汇理大学之间的留学项目的本科生提供研究机会。这些教育模块旨在促进镁合金的材料教育。它们适合纳入K-12课程，并以英语和西班牙语编写，后者不仅可以在西班牙使用，而且在美国的西班牙语社区也可以使用。总体而言，拟议的国际努力旨在通过了解新型镁锰稀土合金的加工-组织-性能关系来产生持久的影响，同时也教育年轻的科学家。

This collaborative research between the Universidad Politecnica de Madrid (UPM, Spain), IMDEA Materials Institute (Madrid, Spain), and Michigan State University (MSU) combines an experimental and computational plan to study the microstructural evolution during processing and the damage nucleation and progression that occurs due to mechanical deformation in magnesium-manganese-rare earth (Mg-Mn-RE) alloys. Microstructural characterization is performed in order to develop a crystallographically-based understanding of how details of the deformation behavior correlate with grain nucleation and grain growth during processing and damage nucleation during ambient and elevated-temperature tension and creep experiments. In-situ tensile and tensile-creep experiments performed inside a scanning electron microscope allow for the identification of the initial damage events and deformation progression as well as the deformation evolution. Simulations of experimentally-characterized microstructures provide a means to interpret and analyze the quantitative experimental data. The details of deformation processes that cause damage are quantitatively identified. Such details provide the framework for introducing damage nucleation and deformation evolution information into microstructural models. The methodology developed integrates material and component design by developing predictive capabilities that link microstructural response with macrostructure performance.This work seeks to overcome one of the most challenging aspects of structural alloys, increasing ambient and elevated-temperature strength and creep resistance while maintaining ductility. Other aspects of the work entail producing educational modules on processing and characterization of Mg alloys, expanding an established K-12 outreach program at MSU so that it can reach more K-12 students in the USA and Spain through remote operation of a SEM, providing research opportunities for undergraduate students involved in existing MSU programs as well as those to be involved in the study abroad program between MSU and the UPM. The educational modules are intended to promote materials education of Mg alloys. They are appropriate for inclusion in K-12 curriculum, and are created both in English and Spanish, the latter of which can be used not only in Spain but also in Spanish-speaking communities in the USA. Overall, the proposed international effort is intended to make a lasting effect by understanding processing-microstructure-property relationships of novel Mg-Mn-RE alloys, while also educating young scientists.