基体合金元素对碳纤维增强铝基复合材料组织与性能的影响

Effect of Matrix Alloy Elements on Microstructure and Properties of Carbon Fiber Reinforced Aluminum Composites

基体合金元素对碳纤维增强铝基(CF/Al)复合材料的性能和应用具有较大影响。采用超声波振动工艺制备CF/Al复合材料试样,研究了Si,Cu和Mg元素对复合材料组织以及抗拉强度的影响。结果表明,合金元素在基体中的分布对复合材料的性能有着严重影响。Si元素对Al_4C_3的产生抑制较弱使复合材料抗拉强度降低,仅为131 MPa。Cu元素在碳纤维周围富集阻碍Al_4C_3脆性化合物的形成,但其产生的Al_2Cu为脆性化合物。而Mg元素极易在碳纤维周围实现均匀分布,抑制脆性化合物形成的同时,使得复合材料抗拉强度提升到273 MPa。

The matrix alloy elements have great influence on the properties and applications of carbon fiber reinforced aluminum matrix （CF/A1） composites. Ultrasonic vibration technology was used to prepare CF/AI composites. The effects of Cu, Si and Mg on the microstmcture and tensile strength of the composites were studied. The results show that the distribution of alloy elements in matrix has a serious effect on the properties of composites. The weak inhibition of Si element on the production, of A14C3 reduced the tensile strength of the composite, it is only 131 MPa. The enrichment of Cu element around carbon fiber inhibits the formation of Al4C3 brittle compounds, but the brittle compound of A12Cu will formed, which reduces the properties of the composites. Mg is easily aggregated around carbon fiber, which can inhibit the formation of brittle compounds and enhance the tensile strength of the composites to 273 MPa.