CAREER: Understanding Interface-Mediated Deformation in Layered Composites through Modeling and Experiment

职业：通过建模和实验了解层状复合材料中界面介导的变形

基本信息

批准号：
1652662
负责人：
CAIZHI ZHOU
金额：
$ 50万
依托单位：
Missouri University of Science and Technology
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-02-01 至 2020-02-29
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1652662&HistoricalAwards=false
关键词：
CAREER Understanding Interface Mediated Deformation

项目摘要

Metallic nanolayered composites are a special class of metallic composite materials with ultra-fine layer thicknesses which impart unique behavior. They exhibit large increases in strength compared to larger-scale bulk constituents. In some cases, they display increased ductility, high radiation damage tolerance, shock resistance, and thermal stability; thus showing great potential for applications in a variety of fields. These materials can lead to new performance levels and energy efficiency not achievable with current materials and thus can have a significant economic impact. However, a lack of understanding of the underlying mechanisms that control the properties of metallic nano layered composites severely limits our current ability to process and tailor them. This Faculty Early Career Development (CAREER) award supports fundamental research to advance fundamental knowledge, develop computational tools and provide design guidelines for metallic nanolayered composites with exceptional controllable properties. Results from this research have the potential to enhance U.S. competitiveness within the markets of aerospace and electronic devices. As part of this project, the research results will be made available to other researchers and the general public through publications and active participation in conferences and workshops. With the aim of educating the twenty-first century workforce, this work also increases the exposure of high school students to science and technology concepts through outreach programs, and provides invaluable educational opportunities for student researchers to collaborate with National Laboratories.This research is to develop a new experimentally-validated multiscale-modeling approach to elucidate the mechanical properties and deformation mechanisms of metallic nanolayered composites. The specific research objectives are: (i) to explore the influence of dislocation-interface interactions on the strength of metallic nanolayered composites; (ii) to investigate the effects of the interface structure and layer thickness on the ductility and plastic instability; (iii) to identify the roles of interface structure and material properties of constituents in the texture evolution during the accumulative roll bonding process; (iv) to reveal the microscopic mechanisms for cyclic deformation behavior of metallic nanolayered composites. The research results will provide insights into the interaction between dislocations and interfaces and their interplay with macroscopically applied fields. The seamless integration of the multiscale-modeling approach and experiment studies will allow one-to-one comparisons between fundamental defect models and deformation experiments on nanostructured materials, creating a unique opportunity for testing the applicability of state-of-the-art theories of crystal defects in real materials systems.

金属纳米层的复合材料是一类特殊的金属复合材料，具有超细层厚度，赋予了独特的行为。与大型体积成分相比，它们的强度大大增加。在某些情况下，它们显示出增加的延展性，高辐射损伤耐受性，电阻性和热稳定性。因此，在各个领域的应用中显示出很大的潜力。这些材料可以导致新的绩效水平和当前材料无法达到的能源效率，因此可以产生重大的经济影响。但是，缺乏对控制金属纳米分层复合材料特性的基本机制严重限制了我们当前处理和量身定制它们的能力。这项教师早期职业发展（职业）奖支持基本研究，以促进基本知识，开发计算工具并为具有卓越可控属性的金属纳米层复合材料提供设计指南。这项研究的结果有可能提高航空航天和电子设备市场中的美国竞争力。作为该项目的一部分，研究结果将通过出版物和积极参与会议和研讨会提供给其他研究人员和公众。 With the aim of educating the twenty-first century workforce, this work also increases the exposure of high school students to science and technology concepts through outreach programs, and provides invaluable educational opportunities for student researchers to collaborate with National Laboratories.This research is to develop a new experimentally-validated multiscale-modeling approach to elucidate the mechanical properties and deformation mechanisms of metallic nanolayered composites.特定的研究目标是：（i）探索脱位界面相互作用对金属纳米层复合材料强度的影响；（ii）研究界面结构和层厚度对延展性和塑料不稳定性的影响；（iii）确定成分界面结构和材料特性在累积滚动键合过程中的质地演化中的作用；（iv）揭示了金属纳米层复合材料的循环变形行为的微观机制。研究结果将提供有关位错和界面之间相互作用及其与宏观应用领域的相互作用之间相互作用的见解。多尺度建模方法和实验研究的无缝集成将允许对纳米结构材料的基本缺陷模型与变形实验之间进行一对一的比较，从而为测试现实材料系统中晶体缺陷的最先进理论的适用性创造了独特的机会。