Mechanical Behavior of Nanolayered Metal/Ceramic Composite Coatings

纳米层金属/陶瓷复合涂层的机械性能

• 批准号: 0504781
• 负责人: Nikhilesh Chawla
• 金额: --
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0504781&HistoricalAwards=false
• 关键词: Mechanical; Behavior; Nanolayered; Metal; Ceramic

TECHNICAL: This action supports a collaborative research program to address important issues on the mechanical behavior of multilayered nanoscaled composites. In recent years, layered materials engineered at the nanoscale have exhibited exciting possibilities for producing extremely high strength, fatigue resistance, thermal resistance, wear resistance, and biocompatibility. The research plan consists of following major thrusts: (i) processing by physical vapor deposition (PVD) and microstructure characterization (SEM, TEM, and HRTEM) of multilayered Al/SiC composites (Arizona State); (ii) residual stress characterization by x-ray diffraction and neutron diffraction (Oak Ridge National Laboratory); (iii) deformation behavior by nanoindentation and microforce tensile and fatigue testing (Arizona State); and (iv) simulation of deformation behavior by continuum, dislocation dynamics, and atomistic methodologies. The relationship between processing, nanoscale structure and mechanical properties of metal/ceramic nanolayers is examined by way of experiments employing deposition, characterization and small-scale mechanical testing techniques. Computational simulations across multiple length scales provide fundamental insights into the deformation and fracture mechanisms of nanolayered composites. NONTECHNICAL: Enhancing materials education and public awareness of the importance of nanolayered materials research and its role in addressing societal needs forms a crucial component of the program. A diverse educational and outreach program is integrated with the research program and serves to disseminate, educate, and involve students at all levels as well as the public. The program enhances the university partnership between ASU and UNM. The outreach program has the following components: (i) Creation of a new course on mechanics of nanomaterials offered jointly at ASU and UNM; (ii) Project-based activities and research opportunities for undergraduate students at ASU, UNM, and ORNL; (iii) Recruitment and involvement of underrepresented females and minorities through outreach programs at both ASU and UNM; (iv) virtual thesis defenses for graduate students and the creation of a virtual seminar series; and (v) public awareness by the creation of a website on nanomaterials. UNM is a Minority Institution and a Hispanic Serving Institution with an enrollment of nearly 50% minority students. Existing mechanisms are already in place at ASU and UNM to recruit and involve underrepresented female and minority students. The partnering programs include: Student Outreach and Retention Program (SORP) at ASU, NASA PURSUE (Preparation for University Research of Students in Undergraduate Education) at UNM, the "Graduate Bridge Program" in the Multicultural Engineering Program at UNM, and the NASA SHARP (Summer High-School Apprenticeship Research Program) at UNM.

技术支持：这一行动支持一个合作研究计划，以解决多层纳米复合材料的机械行为的重要问题。近年来，纳米级的层状材料已经展示出令人兴奋的可能性，可产生极高的强度、抗疲劳性、耐热性、耐磨性和生物相容性。研究计划包括以下几个主要方面：（i）物理气相沉积（PVD）工艺和微观结构表征多层Al/SiC复合材料的SEM、TEM和HRTEM（亚利桑那州）;（ii）通过X射线衍射和中子衍射表征残余应力（橡树岭国家实验室）;（iii）通过纳米压痕和微力拉伸和疲劳测试的变形行为（亚利桑那州）;和（iv）模拟变形行为的连续，位错动力学和原子的方法。金属/陶瓷纳米层的加工，纳米结构和机械性能之间的关系进行检查通过实验采用沉积，表征和小规模的机械测试技术。跨多个长度尺度的计算模拟为纳米层复合材料的变形和断裂机制提供了基本见解。非技术性：加强材料教育和公众对纳米材料研究的重要性及其在解决社会需求方面的作用的认识是该计划的重要组成部分。一个多样化的教育和推广计划与研究计划相结合，并致力于传播，教育和参与各级学生以及公众。该计划加强了ASU和UNM之间的大学伙伴关系。该外联方案有以下组成部分：（一）创建一个新的课程，在亚利桑那州立大学和UNM联合提供纳米材料力学;（二）基于项目的活动和研究机会，为本科生在亚利桑那州立大学，UNM，和ORNL;（三）招聘和参与代表性不足的女性和少数民族通过外联方案在亚利桑那州立大学和UNM;（iv）为研究生进行虚拟论文答辩，并创建虚拟研讨会系列;以及（v）通过创建纳米材料网站提高公众认识。UNM是一个少数民族机构和西班牙裔服务机构，近50%的少数民族学生入学。亚利桑那州立大学和新墨西哥大学已经建立了现有机制，以招募代表性不足的女性和少数民族学生。伙伴计划包括：学生拓展和保留计划（SORP）在亚利桑那州立大学，美国宇航局追求（大学本科教育学生的研究准备）在UNM，在UNM的多元文化工程项目的“研究生桥梁计划”，和美国宇航局夏普（夏季高中学徒研究计划）在UNM。