Radiation Response and High Temperature Stability of Nanotwinned Metals

纳米孪晶金属的辐射响应和高温稳定性

• 批准号: 1129041
• 负责人: Yashashree Kulkarni
• 金额: $ 22.84万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1129041&HistoricalAwards=false
• 关键词: Radiation; Response; Temperature; Stability; Nanotwinned

The goal of this research project is to elucidate the behavior of nanotwinned structures under extreme environments due to irradiation and high temperatures. As nuclear power plays an increasingly vital role in meeting our demand for energy in an environmentally acceptable manner, the design of structural materials that can sustain extreme radiation environments is a critical challenge for future nuclear power systems. Recently, a new class of nanomaterials known as nanotwinned metals has shown extraordinary structural properties such as ultra-high yield strength, high ductility, and enhanced stability at high temperatures. Thus, their optimal design could lead to a possibly enhanced performance of nanotwinned metals as next-generation radiation-resistant materials. Employing multi-scale computational methods and atomistic simulations, the project will address fundamental questions pertaining to the response of nanostructured materials to radiation effects caused by formation and interaction of point defects. This project also investigates critical issues, namely, creep and grain growth, that become dominant mechanisms of deformation in nanostructured metals at elevated temperatures.The research will contribute to several important areas of nanostructured metal science and technology by providing insight into the deformation mechanisms governing their behavior under extreme conditions. It aims to lead to a synergy among experimental, analytical and manufacturing efforts for the optimal design of novel nanomaterials for critical structural applications such as nuclear reactors and storage facilities, defense and biomedical applications. Moreover, graduate and undergraduate students working on the project would develop a strong foundation in the highly multidisciplinary areas of nanomechanics and computational materials science.

这项研究项目的目标是阐明纳米孪晶结构在极端环境下因辐射和高温而产生的行为。随着核电在以环境可接受的方式满足我们对能源的需求方面发挥着越来越重要的作用，能够承受极端辐射环境的结构材料的设计对未来的核电系统来说是一个严峻的挑战。最近，一类被称为纳米孪生金属的新型纳米材料表现出了非凡的结构性能，如超高屈服强度、高延展性和增强高温稳定性。因此，它们的优化设计可能会导致纳米孪晶金属作为下一代抗辐射材料的性能得到增强。利用多尺度计算方法和原子模拟，该项目将解决与纳米结构材料对点缺陷的形成和相互作用引起的辐射效应的响应有关的基本问题。该项目还研究了纳米结构金属在高温下变形的关键问题，即蠕变和晶粒长大，这些问题成为纳米结构金属在高温下变形的主要机制。通过深入了解纳米结构金属在极端条件下行为的变形机制，该研究将有助于纳米结构金属科学和技术的几个重要领域。它的目的是在实验、分析和制造工作之间实现协同，以优化设计用于关键结构应用的新型纳米材料，如核反应堆和存储设施、国防和生物医学应用。此外，参与该项目的研究生和本科生将在纳米力学和计算材料科学等高度多学科的领域奠定坚实的基础。