Microstructure and tensile behavior of 2D-Cf/AZ91D composites fabricated by liquid-solid extrusion and vacuum pressure infiltration

doi:10.1016/j.jmst.2016.03.026

Abstract

Abstract:

2D carbon fiber reinforced AZ91D matrix composites (2D-C_f/AZ91D composites) were fabricated by liquid-solid extrusion and vacuum pressure infiltration technique (LSEVI). In order to modify the interface between fibers and matrix and protect the fiber, pyrolytic carbon (PyC) coating was deposited on the surface of T700 carbon fiber by chemical vapor deposition (CVD). Microstructure observation of the composites revealed that the composites were well fabricated by LSEVI. The segregation of aluminum at fiber surface led to the formation of Mg₁₇Al₁₂ precipitates at the interface. The aluminum improved the infiltration of the alloy and PyC coating protected the fibers effectively. The ultimate tensile strength of 2D-C_f/AZ91D composites was about 400 MPa. The fracture process of 2D-C_f/AZ91D composites was transverse fiber interface cracking-matrix transferring load-longitudinal fibers bearing load-longitudinal fibers breaking.

Key words: Magnesium matrix composites, Microstructure, Tensile properties, Fracture behavior

Li Shaolin, Qi Lehua, Zhang Ting, Zhou Jiming, Li Hejun. Microstructure and tensile behavior of 2D-C_f/AZ91D composites fabricated by liquid-solid extrusion and vacuum pressure infiltration[J]. J. Mater. Sci. Technol., 2017, 33(6): 541-546.

Figures/Tables 13

Table 1 Chemical component of AZ91D alloy (wt%).

Al	Zn	Mn	Si	Fe	Cu	Ni	Be	Mg
9.02	0.69	0.22	0.07	0.001	0.004	0.00006	9 ppm	Bal.

Table 2 Mechanical properties of T700 carbon fiber.

Tensile strength (GPa)	Tensile modulus (GPa)	Elongation (%)	Bending strength (MPa)	Interlaminar shear strength (MPa)
4.1	242	1.72	782	47.7

Table 3 Deposition parameters of PyC coating on carbon fiber.

Temperature (°C)	Holding time (h)	Flow rate of CH₄ (m³/h)	Flow rate of C₃H₈ (m³/h)
1050	6	2.0	0.45

Fig. 1. (a) Infiltration microstructure of 2D-Cf/AZ91D composites and (b) EDS line scanning along the arrow in Fig. 1(a).

Fig. 2. Higher magnification micrograph showing the microstructure of 2D-Cf/AZ91D composites and EDS results of points A and B.

Fig. 3. XRD pattern of 2D-Cf/AZ91D composites.

Fig. 4. High magnification micrograph of 2D-Cf/AZ91D composites.

Fig. 5. (a) Micrograph showing the interface of 2D-Cf/AZ91D composites and EDS results of element distributions of: (b) C mapping, (c) Mg mapping, (d) Al mapping of the marked region.

Fig. 6. Transmission electron micrograph of 2D-Cf/AZ91D composites and the SAED pattern of interfacial product.

Fig. 7. Tensile curves of 2D-Cf/AZ91D composites and AZ91D.

Fig. 8. Tensile fracture surface morphology of 2D-Cf/AZ91D composites.

Fig. 9. Detail view of fracture surface of 2D-Cf/AZ91D composites.

Fig. 10. Load transfer schematic of 2D-Cf/AZ91D composites: (a) before loading; (b) transverse fiber interface cracking; (c) longitudinal fibers breaking.

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Microstructure and tensile behavior of 2D-C_f/AZ91D composites fabricated by liquid-solid extrusion and vacuum pressure infiltration

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