碳纤维增强建筑用ZL109合金的组织及拉伸性能分析

Microstructure and tensile properties of carbon fiber reinforced ZL109 alloy for building

以M40J碳纤维作为增强材料,在铝镁系ZL109合金表面通过真空压力浸渗工艺处理得到体积比为50%的纤维增强Cf/Al基复合材料。通过实验测试手段研究其组织及力学性能,研究结果表明:Cf/Al基材料密度与基体合金相比发生了一定程度的减小,实现减重的效果。编织预制体经过浸渗处理后并未发生畸变,纤维束间隙受到基体金属的紧密填充,各纤维束保持整齐排列状态。纤维偏聚部位形成了一些微孔并产生微裂纹,纤维浸渗后引起了较大的畸变。C纤维与Al基体之间出现了界面反应。复合材料室温拉伸发生脆性断裂,在断裂区域纤维和基体达到了紧密结合状态。提高拉伸温度形成了更加不平整的断口组织和大量拔出纤维,形成了剪切破坏类型的断口。

The fiber reinforced Cf/Al matrix composites with a volume ratio of 50%were prepared by vacuum pressure impregnation on the surface of aluminum-magnesium ZL109 alloy using M40J carbon fiber as reinforcement material.The structure and mechanical properties of Cf/Al based materials were studied by means of experimental tests.The results show that the density of Cf/Al based materials decreases to a certain extent compared with that of the matrix alloy to achieve the effect of weight reduction.After infiltration treatment,no distortion occurs in the braid prefabricated body,and the fiber bundle gap is closely filled with the matrix metal.Some micropores are formed and microcracks are formed in the fiber's partial location,which cause great distortion after fiber infiltration.Interfacial reaction between C fiber and Al matrix appears in Cf/Al substrate.Brittle fracture occurs when the composite is stretched at room temperature,and the fiber and matrix are tightly bonded in the fracture zone.Increasing the tensile temperature results in a more uneven fracture structure,a large number of fibers are pulled out,and a fracture of shear failure type is formed.