Analysis and control of microstructure of metal matrix composite under stress loading

应力加载下金属基复合材料微观结构分析与控制

基本信息

批准号：
04452280
负责人：
KANETAKE Naoyuki
金额：
$ 4.54万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452280/
关键词：
Metal matrix composites Particle reinforcement Mechanical property Deformation Fracture Microstructure

项目摘要

The present research aims at analyzing microscopic behavior of particles, matrix and their interfaces of particle reinforced metal matrix composites during static loading and making clear the effects of their fabricating processes on the behavior. The in situ tensile test in the scanning electron microscope equipped with a defromation stage was investigated at the first of all. As the result the test was successfully examined and it was possible to observe only microstructural degradation owing to structural defects under homogeneous stress distribution. It was also found that the same microstructural degradation was occurred inside the specimen as wel as that observed on its surface.Some Al_2O_3 and SiC particle dispersed aluminum alloy composites were produced with the powder extruding and melt stirring methods. The change in microstructure of the composites was observed continuously during tensile loading by the in situ tensile test. Some microcracks owing to the interface debonding and the particle fracture are initiated at early loading point before maximum loading in all composites. The microcracks do not propagate in the matrix because of its ductility, but the number of new microcracks are increased with inceasing strain. The character of the microcracks and their change are depend on the fabricating process of the composites.

本研究旨在分析颗粒增强金属基复合材料在静态加载过程中颗粒、基体及其界面的微观行为，并明确其制造工艺对其行为的影响。首先对配备变形台的扫描电子显微镜中的原位拉伸试验进行了研究。结果，测试成功进行了检查，并且可以仅观察到由于均匀应力分布下的结构缺陷而导致的微观结构退化。还发现试样内部和表面都发生了同样的微观结构退化。采用粉末挤压和熔融搅拌的方法制备了Al_2O_3和SiC颗粒分散的铝合金复合材料。通过原位拉伸试验，连续观察拉伸加载过程中复合材料微观结构的变化。在所有复合材料中，由于界面脱粘和颗粒断裂而产生的一些微裂纹是在最大载荷之前的早期载荷点开始的。由于基体具有延展性，微裂纹不会在基体中扩展，但新微裂纹的数量会随着应变的增加而增加。微裂纹的特征及其变化取决于复合材料的制造工艺。