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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Fabrication of A356 composite reinforced with micro and nano Al_2O_3 particles by a developed compocasting method and study of its properties
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Fabrication of A356 composite reinforced with micro and nano Al_2O_3 particles by a developed compocasting method and study of its properties

机译：改进的复合铸造法制备微细和纳米Al_2O_3颗粒增强的A356复合材料及其性能研究

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摘要

Aluminum/alumina composites are used in automotive and aerospace industries due to their low density and good mechanical strength. In this study, compocasting was used to fabricate aluminum-matrix composite reinforced with micro and nano-alumina particles. Different weight fractions of micro (3, 5 and 7.5 wt.%) and nano (1, 2,3 and 4 wt.%) alumina particles were injected by argon gas into the semisolid state A356 aluminum alloy and stirred by a mechanical stirrer with different speeds of 200, 300 and 450 rpm. The microstructure of the composite samples was investigated by Optical and Scanning Electron Microscopy. Also, density and hardness variation of micro and nano composites were measured. The microstructure study results revealed that application of compocasting process led to a transformation of a dendritic to a nondendritic structure of the matrix alloy. The SEM micrographs revealed that Al_2O_3 nano particles were surrounded by silicon eutectic and inclined to move toward inter-dendritic regions. They were dispersed uniformly in the matrix when 1,2 and 3 wt.% nano Al_2O_3 or 3 and 5 wt.% micro Al_2O_3 was added, while, further increase in Al_2O_3 (4 wt.% nano Al_2O_3 and 7.5 wt.% micro Al_2O_3) led to agglomeration. The density measurements showed that the amount of porosity in the composites increased with increasing weight fraction and speed of stirring and decreasing particle size. The hardness results indicated that the hardness of the composites increased with decreasing size and increasing weight fraction of particles.
机译：铝/氧化铝复合材料由于其低密度和良好的机械强度而用于汽车和航空航天工业。在这项研究中，采用复合浇铸法制造了由微米和纳米氧化铝颗粒增强的铝基复合材料。通过氩气将不同重量分数的微米（3、5和7.5 wt。％）和纳米（1、2,3和4 wt。％）氧化铝颗粒注入半固态A356铝合金，并通过机械搅拌器搅拌200、300和450 rpm的不同速度。通过光学和扫描电子显微镜研究了复合材料样品的微观结构。而且，测量了微米和纳米复合材料的密度和硬度变化。显微组织研究结果表明，复合铸造工艺的应用导致基体合金的树枝状结构转变为非树枝状结构。 SEM显微照片显示，Al_2O_3纳米粒子被硅共晶包围，并倾向于向枝晶间区域移动。当添加1,2和3 wt。％的纳米Al_2O_3或3和5 wt。％的微Al_2O_3时，它们均匀地分散在基质中，同时进一步增加了Al_2O_3（4 wt。％的纳米Al_2O_3和7.5 wt。％的微Al_2O_3 ）导致了结块。密度测量结果表明，复合材料中的孔隙度随重量分数的增加，搅拌速度的增加和粒度的减小而增加。硬度结果表明，随着颗粒尺寸的减小和重量分数的增加，复合材料的硬度增加。

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