铝-碳化硅烧结过程及其力学性能的分子动力学研究
Study on Molecular Dynamics of Sintered Al-SiC Composite System and Its Mechanical Properties
朱永超 1李巍 1牛丽薇 1李正辉 1王蕾2
作者信息
- 1. 河南省高速铁路运营维护工程研究中心, 河南 郑州 451460
- 2. 河南省计量科学研究院, 河南 郑州 450001
- 折叠
摘要
运用分子动力学方法模拟了铝-碳化硅复合体系的烧结过程,对含有不同尺寸碳化硅颗粒的烧结体进行了结构分析和拉伸测试.通过计算金属铝所占体积及其内部孔洞的体积,发现碳化硅颗粒尺寸的增加能够促进复合材料烧结后的致密程度,但过小的增强体反而会增加孔隙率和孔洞尺寸;通过对烧结体原子结构分析和准静态拉伸,发现碳化硅颗粒尺寸的增加能够提高位错密度,但这不能带来拉伸强度的稳步提升,而烧结体的抗拉强度主要取决于其内部最大孔洞的尺寸.在本模拟尺度下,增强体与金属颗粒在尺寸相近时可以得到良好的密实效果和力学性能.
Abstract
The molecular dinamics were employed to model the sintering process of Al-Silicon carbide(SiC)composite system,and the structure analysis and tensile process of sintered bulks containing SiC particles of different sizes were carefully investigated.By calculating the volume of aluminum and the volume of internal holes,it is found that the increase of SiC particle size can promote the compactness of the composites after sintering,but too small size increases the porosity and the pore size.Through the analysis of sintered atomic structure and quasi static stretching,it can be concluded that the increase of SiC particle size can improve the dislocation density,but the improvement of tensile strength can not be achieved stably,because the tensile strength of sintered composite mainly depends on the size of the largest hole.In this atomic scale,sintered bulk with good compactness and great mechanical property can be prepared when the size of reinforcement is close to metal particles.
关键词
分子动力学/烧结/Al-SiC复合材料/力学性能Key words
molecular dinamics/sintering/Al-SiC composite/mechanical properties引用本文复制引用
基金项目
国家自然科学基金青年科学基金(62003313)
河南省科技攻关计划(202102310576)
河南省高等学校重点科研项目(21B560018)
出版年
2024
NETL
NSTL
万方数据