Microstructure and mechanical properties of graphite fiber-reinforced high-purity aluminum matrix composite
Microstructure and mechanical properties of graphite fiber-reinforced high-purity aluminum matrix composite
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DOI：
10.1007/s10853-009-3639-9
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发表时间：
2009-06
影响因子：
4.5
通讯作者：
X. Wang;G. Chen;B. Li;G. H. Wu;D. Jiang
中科院分区：
文献类型：
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作者：
X. Wang;G. Chen;B. Li;G. H. Wu;D. Jiang
在国内外铝基复合材料的研究中，大多采用工业纯铝（杂质元素含量为0.5wt%）。然而，在高温下制备复合材料时，工业纯铝中的杂质元素会对界面产生影响。因此，有必要使用高纯度铝（杂质元素小于0.01%）作为基体，以便能够研究增强体与基体之间的界面反应。在本研究中，在Grf/Al复合材料中，观察到脆性Al 4C 3在纤维/基体界面处的拉伸。拉伸和弯曲试验后复合材料的断口平整，无纤维拔出现象，表现为脆性断裂特征。这与Al 4C 3有关，因为在加载过程中，Al 4C 3脆性相可能先于纤维断裂，成为裂纹萌生点，而相应的裂纹可能在纤维和周围的铝基体中扩展，最终导致复合材料的低应力断裂。
Industrial pure aluminum (0.5 wt% impurity elements) was utilized in many investigations of aluminum matrix composites at home and abroad. However, impurity elements in industrial pure aluminum may influence the interface during fabrication of composite at high temperature. Thereby, it is necessary to use high-purity aluminum (impurity elements less than 0.01%) as matrix to enable study the interface reaction between reinforcement and matrix. In this study, stretches of brittle Al4C3at the fiber/matrix interfaces in Grf/Al composite were observed. The fracture surface of the composite after tensile and bending tests was flat with no fiber pull-out, which revealed characteristic of brittle fracture. This was related to Al4C3, as this brittle phase may break before the fiber during loading and become a crack initiation point, while the corresponding crack may propagate in the fiber and the surrounding aluminum matrix, finally resulting in low stress fracture of composites.