基于真实三维微观结构研究SiCp/Mg复合材料细观力学性能

项目名称： 基于真实三维微观结构研究SiCp/Mg复合材料细观力学性能

项目编号： No.51201155

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 原梅妮

作者单位： 中北大学

项目金额： 25万元

中文摘要： SiCp/Mg复合材料内部的微观结构严重影响复合材料力学性能和物理性能，对其结构设计、性能演化、损伤失效的表征与预报必须建立在准确表征复合材料微观结构基础上。所以，本项目把连续切片三维重构、分子动力学和有限元分析相结合建立"三维微观结构-可视化演示-力学性能"相关联的正向材料预测与反向材料设计模型。首先，采用连续切片三维重构和分子动力学建立SiC增强颗粒、Mg合金基体及界面三维真实微观结构，实现SiCp/Mg复合材料微观结构三维可视化；然后，基于真实三维微观结构，借助有限元揭示SiC增强颗粒、Mg合金基体、界面等微观结构对SiCp/Mg复合材料宏微观力学性能、物理性能、变形失效机理的影响，定量建立SiCp/Mg复合材料微观结构与宏观性能之间关系。该研究克服了复合材料细观力学研究中微观信息考虑不足，为SiCp/Mg复合材料结构优化、失效分析、制备工艺等提供重要的理论依据。

中文关键词： 金属基复合材料；真实微观结构；失效；有限元；

英文摘要： The mechanical and physical properties of SiCp/Mg composites seriously depend on its microstructures, characterizating and predicting the structure design, property evolution and damage failure of composites should be based on the accurately characterization of composite microstructures， Therefore, the related model of "three dimensional microstructure-visual presentation-mechanical properties" i.e. the forward materials prediction and the reverse materials design model, was built by combining serial section-based three dimensional reconstruction, molecular dynamics simulation and finite element analysis. Firstly, the three dimensional real microstructures of SiC reinforcement particles, Mg alloy matrix and interface were built by using serial section-based three dimensional reconstruction and molecular dynamics simulation. The three dimensional shape of composite microstructures can be visualized. Then, based on the real three dimensional microstructures of composites, the effects of the microstructures of SiC reinforcement particles, Mg alloy matrix and interface on the micro-macro mechanical properties, physical properties and deformation failure mechanism of SiCp/Mg composites were researched by using finite element analysis. Moreover, the quantitative relationship between the microstructure and the macrosc

英文关键词： Metal matrix composites；Microstructure；Failure；Finite element simulation；