Materials World Network: High Temperature Mechanical Behavior of Metal/Ceramic Nanolaminate Composites

非技术描述：天然和人造层状结构具有极高的强度、韧性、耐热性和生物相容性。在微观尺度上，层状层状组织是钢作为结构材料具有高强度和高韧性的基本基础。自然界中的结构，如软体贝壳，其高强度和韧性来自由有机胶粘合在一起的层状陶瓷结构。事实上，工程材料的结构常常模仿自然界中的结构。纳米尺度的多层材料显示出极高的强度、耐疲劳性、耐热性、耐磨性和生物兼容性。因此，在纳米尺度上设计层状结构是开发具有巨大可能性的新一代多功能材料的一种特别有吸引力的策略。纳米层状材料具有与传统块体复合材料非常不同的性质，这是因为它们具有更大的界面面积和更小的长度尺度。这些变化可能导致新类型的变形机制，这与在块体系统中观察到的机制非常不同。在纳米尺度上对金属/陶瓷多层膜的力学行为进行基础研究是这些材料成功应用于工程应用所必需的。技术细节：这个国际项目主要关注多层金属/陶瓷材料的高温行为。该合作项目的重点是研究与高温行为和小尺度塑性有关的基础科学，特别是在大约束下，载荷传递到高刚度陶瓷层，以及对纳米结构如何影响高温变形的基本理解。该项目涉及亚利桑那州立大学的Nik Chawla教授和他的研究团队，以及西班牙马德里理工大学马德里高级材料研究所(IMDEA)的Jon Molina-Aldareguia博士和他的研究团队(西班牙的工作由西班牙国家科学基金会资助)。此外，这与洛斯阿拉莫斯国家实验室的研究人员也有很强的联系。将使用尖端技术，如高温纳米压痕和扫描电子显微镜(SEM)的原位压痕。新一代研究生正在通过国际经验进行培训，课程材料的编写正以西班牙语共享，以吸引在科学和工程领域任职人数较少的学生。

NON-TECHNICAL DESCRIPTION: Natural and man-made layered structures exhibit extremely high strength, toughness, thermal resistance, and biocompatibility characteristics. On the microscopic scale, lamellar layered structures are the basic foundation for the high strength and toughness of steel as a structural material. Structures in nature, such as mollusk shells, derive their high strength and toughness from a layered ceramic structure bonded together by an organic glue. Indeed, the structure of engineering materials often mimics the structures in nature. Multilayered materials at the nanoscale exhibit exciting possibilities for extremely high strength, fatigue resistance, thermal resistance, wear resistance, and biocompatibility. Thus, designing layered structures at the nanoscale is a particularly attractive strategy for developing a new generation of multifunctional materials with tremendous possibilities. Nanolaminate materials have very different properties from traditional bulk composites, due to their much higher interfacial area and dramatically smaller length scale. These changes can lead to new types of deformation mechanisms, which are very different from those observed in bulk systems. Fundamental research on the mechanical behavior of metal/ceramic multilayers at the nanoscale is necessary for successful implementation of these materials in engineering applications.TECHNICAL DETAILS: This international project focuses on the high temperature behavior of multilayered metal/ceramic materials. The collaborative project focuses on studying the fundamental science related to high temperature behavior and plasticity at small length scale, particularly under large constraint, load transfer to high stiffness ceramic layers, and a basic understanding of how nanostructure influences high temperature deformation. This project involves Prof. Nik Chawla and his research team at Arizona State University and Dr. Jon Molina-Aldareguia and his research group at the Madrid Institute for Advanced Studies of Materials (IMDEA) in the Polytechnic University of Madrid, Spain (where the Spanish effort is funded by the Spanish National Science Foundation). As well there are strong linkages to researchers at Los Alamos National Laboratory. Cutting-edge techniques, such as high temperature nanoindentation, and in situ indentation in a scanning electron microscope (SEM) will be used. A new generation of graduate students are being trained through international experiences, and the development of course material is being shared in Spanish to attract students underrepresented in science and engineering.