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

• 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

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，基质及其在静态载荷过程中粒子增强金属基质复合材料的界面的微观行为，并清楚其制造过程对行为的影响。首先研究了配备有缩变阶段的扫描电子显微镜中的原位拉伸试验。结果，该测试被成功检查，并且由于在均质应力分布下的结构缺陷，可以仅观察微结构降解。还发现，样品内发生了相同的微结构降解，就像在其表面上观察到的。有些Al_2O_3和SIC颗粒分散的铝合金复合材料是用粉末挤出和融化的搅拌方法产生的。通过原位拉伸测试在拉伸负荷过程中连续观察到复合材料的微观结构的变化。在所有复合材料中，在最大加载之前，在早期加载点开始启动一些由于界面脱键和颗粒断裂而引起的微裂纹。由于其延展性，微裂纹不会在基质中传播，但是随着菌株的发生，新的微裂纹数量增加。微裂纹的特征及其变化​​取决于复合材料的制造过程。