Influence of Fiber Surface Structure on Interfacial Reaction of Carbon Fiber Reinforced Aluminium Matrix Composites

摘要

The quantity of interfacial reaction and mechanical properties of low and high-graphitized carbon fiber reinforced aluminum composite wires were investigated. Materials were low graphitized carbon fiber reinforced pure aluminum wire (volume fraction of fiber (Vf) is 50 percent), high graphitized carbon fiber reinforced pure aluminum (Vf: 53 percent) and Al-Mg(3.4 wt percent) alloy (Vf: 47 percent) wires which were prepared by ultrasonic liquid infiltration. In order to promote aluminum carbide growth, the wires were heat-treated at 573 K and 873 K during 30min. The reaction between high-graphitized carbon fiber and matrix was serious than that between low graphitized carbon fiber and matrix. The strength of wires decreased with the rise in the temperature, because of the aluminums carbide interfacial phase growth. The fracture mode of wires was changed from fiber pullout fracture to flat fracture. The quantity of aluminum carbide in the high graphitized carbon fiber reinforced pure aluminum and alloy matrix wires are almost equal at all temperatures, but the strength degradation of the high graphitized carbon fiber reinforced pure aluminum wire at a high temperature is greater than that of alloy matrix wire.