Investigation on Microstructure and Tensile Properties of Domestic M50J Carbon Fiber/Aluminum Matrix Composites
LI Yang1, CAI Changchun1, YU Huan1,*, XU Zhifeng1, WANG Zhenjun1, ZHANG Yonggang2, QIAN Xin2, ZHONG Junjun2
1 National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,China 2 National Engineering Laboratory of Carbon Fiber Preparation Technology,Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China
Abstract: Polyacrylonitrile (PAN)-based carbon fiber is widely used in many engineering fields owingto its high strength and high modulus. In recent years, great breakthroughs have been made in the preparation technology of high-modulus carbon fibers in China. In order to promote the application of high-modulus carbon fiber in aluminum matrix composites, in this paper, domestic carbon fiber M50J(volume fraction of 45%) was used to fabricate unidirectional M50J/Al composites by using vacuum pressure infiltration method. The microstructure, interfacial reaction of M50J/Al composites were investigated, and uniaxial tensile testing was carried out to test its mechanical properties at room and elevated temperature (350 ℃). The results show that the average relative density of the composite is 98.86%. The arrangement of M50J carbon fiber is homogenous and the cross-section of fiber is regularly circular. No microscopic shrinkage cavity or porosity was found in the matrix alloy. The composites are mainly composed of C, Al, and a small amount of Al3Mg2 and Al4C3 phases. The reaction product appears at the interface between M50J and ZL301 matrix, which was identified as brittle ionic carbide Al4C3 phase, which exhibits a gracile rod shape with small size. At room temperature, the average tensile strength and modulus of the composites are 856 MPa and 204.3 GPa. At the elevated temperature (350 ℃), the average tensile strength and modulus are 774.7 MPa and 197.3 GPa, respectively. The average tensile strength and modulus of M50J carbon fiber that extracted from the composite are 3 280 MPa and 447 GPa, respectively. Compared with the original carbon fiber, the fiber strength and modulus in composites decreases slightly. The interface bonding and micro defects are the main factors that influence the tensile properties of the composite.
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2022, Vol. 36 
