CAREER: Synthesis, Microstructure, and Mechanical Behavior of Metallic Thin Films with Nanoscale Growth Twins

技术:本项目为PI在国内外纳米级生长孪晶金属薄膜的合成和力学性能方面加强课课组的领先地位奠定了坚实的基础，探索了创新的小长度孪晶界面诱导强化机制，扩大了他在金属薄膜力学和电气性能领域的研究专长，并确保了教育计划的发展，成为一名成功的教育家。为了实现研究目标，PI计划探索(1)操纵多晶金属薄膜中纳米尺度生长孪晶的形成(2)纳米尺度孪晶界面中介的强化和变形机制，(3)独立纳米孪晶金属薄膜在拉伸和压缩下的变形能力，(4)生长孪晶的热稳定性和机电性能的演变，以及(5)纳米孪晶金属薄膜的电学性能。该研究计划将探索纳米尺度生长孪晶的创新强化和变形机制。由于缺乏高密度生长孪晶材料，在小长度尺度上孪晶界面对强化和变形机制的作用尚不清楚。该项目的成功将为设计和制造高强度单相材料提供一个新的范例，通过定制纳米级生长孪晶。非技术性：高强度、高导电性的Cu薄膜将对电子、半导体行业以及NEMS/MEMS器件产生巨大影响。这种高强度的纳米孪晶Cu薄膜如果广泛应用于电子工业中，也会对电子工业的发展产生影响。为了实现教育目标，PI将(1)与邻近少数民族服务机构的教师和学生合作；(2)教育和培训研究生和本科生的研究，包括在国家实验室的夏季研究经验；(3)通过校园NSF-RET项目与高中教师和学生有效互动；(4)培养研究生和本科生成为下一代教育工作者。(5)为本科生和研究生制定课程；(6)建立一个网站，传播研究和教育成果。研究和教育计划紧密结合，以促进学习和发现的自然过程。通过与洛斯阿拉莫斯国家实验室、劳伦斯伯克利国家实验室和德国卡尔斯鲁厄Forschungszentrum Karlsruhe的合作，CAREER计划得到了加强。职业规划非常符合部门的长期目标和机构的愿景。CAREER计划将通过多种方式影响研究生和本科生的学习和培训，包括主动学习和教学，在国家实验室的研究经验等。职业计划将寻求将纳米力学领域的研究成果最大限度地传播给更广泛的受众群体，包括少数民族服务机构和高中生。本文描述了一种模式，可以帮助学生成为下一代教育工作者。

TECHNICAL: This project creates a strong foundation for PI to strengthen the lead of his research group in the area of synthesis and mechanical properties of metallic films with nanoscale growth twins nationally and internationally, explore an innovative twin interface induced strengthening mechanism at small length scale, expand his research expertise in the area of mechanical and electrical properties of metal films, and ensure the development of educational plans to become a successful educator. To achieve the research goal, PI plans to explore (1) manipulation of the formation of nanoscale growth twins in polycrystalline metallic films (2) twin interface mediated strengthening and deformation mechanisms at nanometer length scale, (3) deformability of free-standing nanotwinned metallic films under tension and compression, (4) thermal stability of growth twins and evolution of mechanical and electrical properties, and (5) electrical properties of nanotwinned metallic thin films. The research plan will explore innovative strengthening and deformation mechanisms enabled by nanoscale growth twins. The roles of twin interface on strengthening and deformation mechanisms at small length scale are not clear mainly due to a lack of materials with high-density growth twins. The success of the project will lead to a new paradigm to design and fabricate high strength single-phase materials by tailoring nanoscale growth twins. NON-TECHNICAL: High strength, high conductivity Cu films could have dramatic impact on electronic and semiconductor industry, and NEMS/MEMS device. Such high strength nanotwinned Cu films, if widely used in electronic industry, could also impact the development. To achieve the educational goal, PI will (1) collaborate with faculty and students from neighboring minority serving institutions (2) educate and train graduate and undergraduate students on research, including summer research experiences at national laboratories, (3) efficiently interact with high school teachers and students through on-campus NSF-RET programs, (4) prepare graduate and undergraduate students as next generation educators, (5) develop curriculum for undergraduate and graduate students, and (6) develop a website to disseminate research and educational outcome. Research and educational plans are closely integrated to foster a nature process of learning and discovery. The CAREER plan is strengthened by collaborations with Los Alamos National Laboratory, Lawrence Berkeley National Laboratory, and Forschungszentrum Karlsruhe in Germany. The CAREER plan fits very well with departmental long-term goals and institutional vision. The CAREER plan will impact graduate and undergraduate students learning and training through multiple approaches, including active learning and teaching, research experience at national laboratories, etc. The CAREER plan will seek to maximize the dissemination of research outcome in nanomechanics area to a broader group of audience, including minority serving institutions, and high school students. A model is described that may help to prepare students as next generation educators.