Interfacial failure behavior of PyC-Cf/AZ91D composite fabricated by LSEVI
来源期刊:JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第9期
论文作者:Shaolin Li Lehua Qi Ting Zhang Jiming Zhou Hejun Li
文章页码:1602 - 1608
摘 要:Carbon fiber reinforced AZ91 D matrix composites with pyrolytic(PyC) coating deposited on fiber surface(PyC-Cf/AZ91 D composites) have been fabricated by Liquid-solid extrusion following vacuum pressure infiltration technique(LSEVI). Interfacial microstructure and failure behavior of the composites were investigated. Instead of interfacial reaction products, block-shaped interfacial precipitates Mg17 Al12 were detected at the interface, which indicates that interfacial reaction was restrained by LSEVI and PyC coating. Nano-MgO was detected at the interface. Interfacial failure behavior of the PyC-Cf/AZ91 D composites,which was the failure between PyC coating and AZ91 D alloy due to the mismatch of thermal expansion and relatively poor bonding, was proposed. Fracture surface of the PyC-Cf/AZ91 D composites was characterized by fibers pulling-out tests. PyC coating served not only as protection to the fibers, but also an adjustment of the interface of the composites.
Shaolin Li1,Lehua Qi2,Ting Zhang2,Jiming Zhou2,Hejun Li1
1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University2. School of Mechanical Engineering, Northwestern Polytechnical University
摘 要:Carbon fiber reinforced AZ91 D matrix composites with pyrolytic(PyC) coating deposited on fiber surface(PyC-Cf/AZ91 D composites) have been fabricated by Liquid-solid extrusion following vacuum pressure infiltration technique(LSEVI). Interfacial microstructure and failure behavior of the composites were investigated. Instead of interfacial reaction products, block-shaped interfacial precipitates Mg17 Al12 were detected at the interface, which indicates that interfacial reaction was restrained by LSEVI and PyC coating. Nano-MgO was detected at the interface. Interfacial failure behavior of the PyC-Cf/AZ91 D composites,which was the failure between PyC coating and AZ91 D alloy due to the mismatch of thermal expansion and relatively poor bonding, was proposed. Fracture surface of the PyC-Cf/AZ91 D composites was characterized by fibers pulling-out tests. PyC coating served not only as protection to the fibers, but also an adjustment of the interface of the composites.
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