Advanced Nanocrystalline Ceramic Matrix Composites with Improved Fracture Toughness: Processing, Characterization & Modeling

具有改进断裂韧性的先进纳米晶陶瓷基复合材料：加工、表征

• 批准号: 0700272
• 负责人: Amiya Mukherjee
• 金额: $ 52.07万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0700272&HistoricalAwards=false
• 关键词: Advanced; Nanocrystalline; Ceramic; Matrix; Composites

The goal of the proposed project is to conduct an extensive investigation into processing, characterization and modeling of alumina-based nanocomposites in order to fully understand the interplay between processing, structure, and mechanical properties. In general, the conventional and special toughening mechanisms in ceramic nanocomposites are associated with processes occurring on various length scales and thereby need to be theoretically described in terms of multiscale mechanics of materials. The latter is the main aim of analytical multiscale modeling, a part of the proposed research project. The low density, chemical inertness, and high strength/hardness make ceramics a very promising candidate for structural applications. However, utilization of ceramics for such applications is impeded by their relatively low fracture toughness. Thus, the focus of the proposed research is to improve the fracture toughness of alumina by incorporation of second phases to create ceramic matrix composites [CMCs] suitable for structural applications. The intellectual merit lies in the use of microstructural and mechanical properties data collected from PIs? research as well as others to analytically model the toughening mechanisms within nanocrystalline ceramic matrix composites ? a size regime in which interfacial toughening mechanisms are dominant.The broader impacts of the proposed research activity is to develop accurate modeling ofCMCs which would help the scientific community at large to someday predict the theoretical mechanical properties and dominant toughening mechanisms of CMCs. These models can be used to educate students of all levels and will facilitate teaching of underrepresented people in engineering sciences.

拟议项目的目的是对基于氧化铝的纳米复合材料的加工，表征和建模进行广泛研究，以充分了解处理，结构和机械性能之间的相互作用。通常，陶瓷纳米复合材料中的常规和特殊韧性机制与在各个长度尺度上发生的过程有关，因此需要用材料的多尺度力学来描述理论上。后者是分析多尺度建模的主要目的，这是拟议研究项目的一部分。低密度，化学惰性和高强度/硬度使陶瓷成为结构应用的非常有前途的候选人。但是，陶瓷用于此类应用的利用受到相对较低的断裂韧性的阻碍。因此，拟议的研究的重点是通过掺入第二阶段来创建适合结构应用的陶瓷基质复合材料[CMCS]来改善氧化铝的断裂韧性。智力优点在于使用从PI收集的微结构和机械性能数据？研究以及其他人在分析上对纳米晶陶瓷基质复合材料中的加强机制进行建模？界面韧性机制是主导的大小制度。拟议的研究活动的更广泛的影响是开发CMC的准确建模，这将有助于总体上至今的科学界预测理论机械性能和CMC的主流韧性机制。这些模型可用于教育各个层次的学生，并将促进工程科学中代表性不足的人的教学。