金属基纳米复合材料界面位错形核及冲击塑性机理的研究

项目名称： 金属基纳米复合材料界面位错形核及冲击塑性机理的研究

项目编号： No.51471018

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 张瑞丰

作者单位： 北京航空航天大学

项目金额： 80万元

中文摘要： 新型高性能金属基纳米复合材料由于表现出传统材料无法比拟的独特优异性能，成为当前材料科学研究的一个热门核心课题，引起国内外科学工作者的广泛关注。本研究计划将以新型金属基纳米复合材料界面缺陷结构-界面位错形核/滑移塑性-界面强化起源为主线，针对最新报道的、并引起国际社会重点关注的fcc/fcc和fcc/bcc半共格和非共格异质界面结构为原型，深入系统地展开原子级的科学研究。研究方案将综合运用先进的内应力平衡界面建模技术，界面位错的Frank-Bilby求解技术，以及应力-应变准静态模拟和大尺度冲击波动态模拟等技术，在界面结构-界面强化有机统一基础上，提出归一化材料界面设计理念，期望建立 界面缺陷结构-力学性能-界面设计方案的内禀联系，并提出有效的材料设计思路，进而指导设计出新型纳米复合材料，满足高精密和空天技术领域的需求。

中文关键词： 力学性能；强化机理；复合材料

英文摘要： Novel high performance metallic nanocomposites have arose broad interest and much attention in scientific research fields and become a hot topic due to their superior properties and potential industrial applications. In this project, we propose a systematic studies on the typical semi-coherent and incoherent interface types widely observed in newly synthesized metallic nanocomposites. The topic of the proposed research work will focus on the investigations of the atomic scale defect structure of interfaces, the dislocation nucleation and sliding mechanism at interface, and the discovery of the strengthening origin of various interfaces, and consequently underline the intrinsic correlation between interface structure and interfacial strengthening. For this purpose, we shall use the modern interface modeling technique based on the internal stress balance, the Frank-Bilby solution to interface dislocation network, the quasi-static simulation of stress-strain response, and the large scale molecular dynamics simulations of shock wave in solids. A comprehensive understanding and theory will be drawn for the design of novel high performance metallic nanocomposites according to the constructed inter-relationship of interface defect structure-mechanical property-design rule of interface. Such work will open an effective way for further improvement of mechanical properties of the newly discovered materials and the development of new high performance metallic nanocomposites, which can meet the requirement of the application of high-technology industry, high precision fields and the technology of Aeronautics and Astronautics.

英文关键词： mechanical property;strengthening mechanism;composites