Interfacial failure behavior of PyC-C_f/AZ91D composite fabricated by LSEVI  

作　　者：Shaolin Li Lehua Qi Ting Zhang Jiming Zhou Hejun Li 

机构地区：[1]State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University [2]School of Mechanical Engineering, Northwestern Polytechnical University

出　　处：《Journal of Materials Science & Technology》2018年第9期1602-1608,共7页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 51472203, 51575447, 51521061)

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 Mg（17） Al（12） 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.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 Mg（17） Al（12） 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.

关 键 词：MMCS Interface Carbon fiber Failure 

分 类 号：TB2[一般工业技术—工程设计测绘]