国产M50J级碳纤维/铝基复合材料的微观特征及拉伸性能研究

doi:10.11896/cldb.21030323

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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.

Key words： domestic carbon fiber C_f/Al composites tensile property microstructure vacuum-assisted pressure infiltration

Published: 10 November 2022 Online: 2022-11-03

CLC number:

TB333

Fund:National Natural Science Foundation of China (51765045), the Jiangxi Provincial Natural Science Foundation (20202ACBL204010), and the Aeronautical Science Foundation of China (2019ZF056013).

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	LI Yang
	CAI Changchun
	YU Huan
	XU Zhifeng
	WANG Zhenjun
	ZHANG Yonggang
	QIAN Xin
	ZHONG Junjun

Cite this article:

LI Yang,CAI Changchun,YU Huan, et al. Investigation on Microstructure and Tensile Properties of Domestic M50J Carbon Fiber/Aluminum Matrix Composites[J]. Materials Reports, 2022, 36(21): 21030323-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21030323 OR http://www.mater-rep.com/EN/Y2022/V36/I21/21030323

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