Laminate squeeze casting of carbon fiber reinforced aluminum matrix composites
Laminate squeeze casting of carbon fiber reinforced aluminum matrix composites
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DOI：
10.1016/j.matdes.2014.11.034
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发表时间：
2015-02
影响因子：
8.4
通讯作者：
H. Alhashmy;M. Nganbe
中科院分区：
文献类型：
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作者：
H. Alhashmy;M. Nganbe
碳纤维增强铝基复合材料显示出轻质、机械性能、易于加工和低成本的完美结合。然而，标准液体渗透挤压铸造通常需要复杂的预成型件以控制纤维构型和分布。它还需要相对较高的压力来克服预成型件上的压降，这可能导致预成型件压实和损坏，并可能限制可彻底渗透的最大部件厚度。因此，研究了层压挤压铸造工艺作为替代方案，其中纤维织物和铝板的交替层被热固结。液体从两个相邻的铝层渗透到纤维织物中，从而将整个组件高度的渗透距离减少到单个纤维层厚度的一半。这导致快速而彻底的渗透。成功制造了纤维含量在 7 至 14% 之间的复合材料。尽管铝层在 850°C 时完全熔化，但光学和扫描电子显微镜研究表明，静水压力实际上在制造过程中保留了层压结构，并且没有发生纤维团聚。该复合材料表现出良好的纤维-基体粘合性。尽管主要在界面处形成一些碳化物，但没有观察到明显的纤维损伤。碳纤维含量为 7.4 vol% 时，复合材料硬度比参考 6061 基体合金高出 50% 以上。
Carbon fiber reinforced aluminum matrix composites show an excellent combination of lightweight, mechanical properties, ease of processing and low costs. However, standard liquid infiltration squeeze casting often requires complex preforms in order to control fiber configuration and distribution. It also requires relatively high pressures to overcome the pressure drop across the preform, which can lead to preform compaction and damage and can limit the maximum component thickness that can be thoroughly infiltrated. Therefore, a laminate squeeze casting process is investigated as alternative whereby alternate layers of fiber fabrics and aluminum sheets are hot consolidated. Liquid infiltrates the fiber fabrics from their two respective neighboring aluminum layers, thereby reducing the infiltration distance from the entire component height to only half the thickness of individual fiber layers. This results in a rapid and thorough infiltration. Composites with fiber contents between 7 and 14 vol% are successfully fabricated. Despite complete melting of the aluminum layers at 850 °C, optical and scanning electron microscopy investigations show that hydrostatic pressure practically preserves the laminate configuration during fabrication and no fiber agglomeration occurs. The composites show good fiber–matrix bonding. No noticeable fiber damage is observed despite some carbide formation primarily at interfaces. A composite hardness over 50% higher compared to the reference 6061 matrix alloy is achieved at a carbon fiber content of 7.4 vol%.