Mechanical Behavior of Novel Metal-Oxide Composites with Hierachical Microstructures: Effect of Scale and Interfacial Structure

具有分级微观结构的新型金属氧化物复合材料的力学行为：尺度和界面结构的影响

• 批准号: 1507955
• 负责人: Helen Chan
• 金额: $ 46.06万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-01 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1507955&HistoricalAwards=false
• 关键词: Mechanical; Behavior; Novel; Metal; Oxide

NON-TECHNICAL DESCRIPTION: Often, a material with nanometer-sized internal features has remarkable properties such as high strength (when compared to the same material with larger features). However, it can be difficult to create such materials with these nanometer-scale features at an affordable cost and in large quantities. This research project is focused on a new route for creating materials with nanometer-scale layers of ceramics and metals that have the potential to possess unusual and advantageous mechanical properties and to be processed at a reasonable cost. Electron microscopy techniques and specialized small-scale mechanical tests are revealing the role of the ceramics-metal interfaces, the orientation of the individual phases, and the size of the phases on mechanical properties. The results are providing a fundamental scientific understanding of these phenomena that can be applied to fields such as joining of ceramics and metals, creation of strong materials for load-bearing applications, and prevention of failure in microelectronic devices. In addition, the broad scientific concepts developed during this work are being incorporated into outreach activities that target K-12 children, thereby encouraging their participation in science and engineering fields.TECHNICAL DETAILS: This research project is focused on understanding the microstructure development and mechanical behavior of ceramic-metal composites derived from the partial reduction of mixed oxide ceramics that have a delafossite starting structure. Reducing this class of materials to partially remove oxygen yields a hierarchical structure with unique ceramic-metal composite morphologies that hitherto have not been studied and that promise to exhibit attractive mechanical properties. The microstructural scale of the ceramic/metal features range from tens of nanometers to tens of microns, and both layered and globular morphologies can be achieved. The discovery of a unique microstructure that can be created by reducing delafossite materials, combined with the relatively recent advent of aberration-corrected scanning transmission electron microscopes and in situ micro-mechanical testing instruments, make it possible for the first time to reveal the effects of ceramic-metal nanocomposite microstructure scale and lamellar orientation on stiffness, hardness, and toughness. The findings of the study are relevant to technological processes such as joining, and to understanding scaling effects in ceramic-metal systems. Additionally, university-level students are developing expertise in the emerging areas of aberration-corrected scanning transmission electron microscopy and in situ micro-mechanical testing.

非技术描述：通常，具有纳米尺寸内部特征的材料具有出色的特性，例如高强度（与具有较大特征的相同材料相比）。但是，很难以这些纳米规模的特征来以可承受的成本和大量的数量来创建此类材料。该研究项目的重点是一条新的途径，用于创建具有纳米规模层的陶瓷和金属层的材料，这些材料有可能具有异常和有利的机械性能，并以合理的成本进行处理。电子显微镜技术和专门的小型机械测试揭示了陶瓷 - 金属接口的作用，单个相的方向以及相位对机械性能的大小。结果提供了对这些现象的基本科学理解，可以应用于诸如陶瓷和金属的连接，创建强大载荷应用的强大材料以及预防微电子设备失败的领域。此外，在这项工作中开发的广泛的科学概念正在纳入针对K-12儿童的外展活动中，从而鼓励他们参与科学和工程领域。技术细节：该研究项目的重点是了解陶瓷 - 金属材料的微观结构发展和机械行为，从而源自混合氧化物陶瓷的部分降低混合氧化物陶瓷，从而开始了Delaffoss的结构。减少这类材料以部分去除氧，从而产生层次结构，具有迄今尚未研究的独特陶瓷金属复合形态，并且有望表现出有吸引力的机械性能。陶瓷/金属特征的微观结构尺度范围从数十纳米到数十微米，以及分层和球形形态的微观结构范围。发现独特的微观结构可以通过减少Delafossite材料而创建的独特微观结构，再加上相对较新的出现，相对较新的扫描传输电子显微镜以及原位微电机电测试仪器，使得首次有可能揭示陶瓷 - 纳米含量 - 纳米组合微型材料尺度和固定性的效果，并揭示出强度和强度的强度，并具有强度的强度，并具有强度的强度。该研究的发现与诸如加入之类的技术过程有关，并了解陶瓷金属系统中的缩放效应。此外，大学一级的学生正在发展经过异常的扫描传输电子显微镜和原位微机械测试的新兴领域的专业知识。

项目成果

A novel ceramic derived processing route for Multi-Principal Element Alloys

• DOI: 10.1016/j.msea.2020.139892
• 发表时间: 2020-07
• 期刊: Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
• 影响因子: 6.4
• 作者: M. Gianelle;A. Kundu;K. P. Anderson;A. Roy;G. Balasubramanian;H. M. Chan