Interfacial failure behavior of PyC-Cf/AZ91 D composite fabricated by LSEVI

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2018,（9）
• 页码范围: 1602-1608
• 页数: 7页
• 语种: 英文

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 ofinterfacial reaction products,block-shaped interfacial precipitates Mg17Al12 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 AZ91D 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.