CAREER: Nanocrystalline Grain Boundary Network Engineering Enabled by New Deformation Mechanisms

职业：新变形机制实现的纳米晶晶界网络工程

• 批准号: 1255305
• 负责人: Timothy Rupert
• 金额: $ 53.71万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-07-01 至 2019-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1255305&HistoricalAwards=false
• 关键词: CAREER; Nanocrystalline; Grain; Boundary; Network

TECHNICAL SUMMARY:This CAREER award supports a research project to reveal how nanocrystalline grain boundary networks evolve during plastic deformation and understand how this evolution affects subsequent mechanical response. It is hypothesized that the unique deformation physics of nanocrystalline metals will allow for manipulation of the grain boundary network through thermomechanical treatments, connecting the heretofore separate fields of grain boundary engineering and nanostructured materials. Specifically, the research is driven by three technical objectives: (1) characterize the details of the grain boundary network in nanocrystalline materials, (2) measure the evolution of grain boundary character distribution and network topology under thermomechanical cycling, and (3) leverage the insight gained to develop new materials theory which connects grain boundary network details to mechanical behavior. This work will combine advanced characterization techniques, carefully designed mechanical testing, and atomistic simulations to meet these objectives. The insights obtained here will be used to connect interfacial network character to nanocrystalline mechanical behavior and to optimize the design of interfaces in nanostructured materials.NON-TECHNICAL SUMMARY:This program is motivated by several technologically relevant questions: (1) How are the properties of nanostructured materials influenced by the details of their grain boundary networks? (2) How does mechanical deformation, both at room and elevated temperatures, alter these interfacial networks? (3) Can the grain boundary network be optimized, through thermomechanical treatments, to engineer better nanomaterials? This work will provide a roadmap for controlling the details of grain boundary structure and the interconnecting network formed by all boundaries in order to create improved nanostructured materials and enable next-generation technologies. In addition, this project supports an outreach program to broaden the participation of underrepresented minorities and women in Science, Technology, Engineering, and Mathematics (STEM) fields. A multi-tiered approach will be implemented to engage and empower high school students and teachers, as well as undergraduate university students, through direct laboratory experiences and exposure to interdisciplinary research.

技术摘要：该职业奖支持一个研究项目，以揭示纳米晶晶界网络在塑性变形过程中如何演变，并了解这种演变如何影响随后的机械响应。 据推测，纳米晶金属的独特变形物理学将允许通过热机械处理来操纵晶界网络，连接迄今为止分离的晶界工程和纳米结构材料领域。 具体而言，该研究由三个技术目标驱动：（1）表征纳米晶材料中晶界网络的细节，（2）测量热机械循环下晶界特征分布和网络拓扑结构的演变，以及（3）利用所获得的洞察力开发新材料理论，将晶界网络细节与力学行为联系起来。 这项工作将结合联合收割机先进的表征技术，精心设计的机械测试，和原子模拟，以满足这些目标。 在这里获得的见解将被用来连接界面网络字符纳米晶体的机械行为和优化设计的界面在nanostructured materials.NON-TECHNICAL SUMMARY：这个程序是出于几个技术相关的问题：（1）如何影响纳米材料的性能的细节，他们的晶界网络？ (2)在室温和高温下，机械变形如何改变这些界面网络？ (3)通过热机械处理，可以优化晶界网络，以设计更好的纳米材料吗？ 这项工作将为控制晶界结构的细节和所有边界形成的互连网络提供路线图，以创建改进的纳米结构材料并实现下一代技术。 此外，该项目还支持一项外展计划，以扩大代表性不足的少数民族和妇女在科学，技术，工程和数学（STEM）领域的参与。 将实施一种多层次的方法，通过直接的实验室经验和接触跨学科研究，吸引和增强高中学生和教师以及本科生的能力。