Mechanical and Functional Design of Nanostructured Materials

主席计划专注于理解和设计嵌入纳米结构的原子和电子结构，这些结构限制在晶体固体中的位错和界面上，以提高材料性能，使其超过理想化固体的性能。在拟议的研究计划中，朱博士计划通过推进原位电子显微镜技术，并进一步探索她最近在重建的金-氧化物界面和镁中基于位错的纳米结构方面的发现，来研究嵌入纳米结构的形成动力学和性能特征。研究将在三个主题上进行。Theme1将超越朱博士目前基于电子显微镜的原位热机械测试平台的可视化能力，增加新的功能，如以与宏观测试相媲美的方式监控晶体演变和估计机械性能。朱博士将利用主题1中开发的技术来克服嵌入纳米结构的表征困难，并研究线状(主题2)和平面(主题3)嵌入纳米结构在形成、迁移和变形过程中的作用。课题2将确定位错纳米结构的形成动力学和变形物理，以开发先进的镁合金。Theme3将调整金-金红石界面和界面中介的大规模迁移过程，以组装高质量的金红石纳米线。拟议研究的成果包括：i)。新的表征技术可以解析嵌入的纳米结构及其周围的晶格；ii)高强度和高延展性的镁合金和用于生物分子检测的先进氧化物纳米线的开发；iii)能够预测缺陷增强的纳米结构和它们可以产生的相应材料行为的理论框架。研究成果将对航空航天、汽车、可再生能源等重点行业具有重要的参考价值。学生和研究人员将接受独特的技能培训，特别是重新配置电子显微镜和表征新的纳米结构，为他们进一步的学术和职业发展做准备。

The Chair program focuses on understanding and designing atomic and electronic structures of embedded nano-structures, which are confined at dislocations and interfaces in crystalline solids, in order to enhance material performance beyond that of the idealized solid. In the proposed research program, Dr. Zhu plans to study formation dynamics and performance characteristics of embedded nano-structures by advancing in-situ electron microscopy techniques and further exploring her recent findings on reconstructed gold-oxide interfaces and dislocation-based nano-structures in magnesium. Research will be untaken in three themes. Theme1 will expand beyond the visualization capability of Dr. Zhu's current in-situ, electron microscope-based thermo-mechanical testing platform by adding new function such as monitoring crystallographic evolutions and estimating mechanical properties in a way that is comparable to macroscopic testing. Dr. Zhu will make use of the technique developed in Theme1 to overcome the characterization difficulties of embedded nano-structures and study linear (Theme2) and planar (Theme3) embedded nano-structures during formation, migration, and deformation processes. Theme2 will identify formation dynamics and deformation physics of dislocation-based nano-structures to develop advanced magnesium alloys. Theme3 will tune gold-rutile interfaces and interface-mediated mass migration processes to assemble high quality rutile nanowires. The outputs of the proposed research include: i). new characterization techniques that can resolve embedded nano-structures and their surrounding lattices; ii) the development of high-strength and high-ductile magnesium alloys and advanced oxide nanowires for biomolecule detection; iii) a theoretical framework that is capable of predicting defect-enhanced nano-structures and the corresponding material behaviors that they can produce. The results will be of great value to the key industries involved in aerospace, automotive, renewable energy industry. Students and researchers will be trained with the unique skillset, particularly reconfiguring electron microscopes and characterizing new nano-structures, for their further academic and career development.