Mechanical Property of M40Jf/5A06Al Composite at Elevated Temperatures

doi:10.1007/s40195-015-0310-0

Abstract

Abstract:

In this work, aluminum alloy with a high concentration of magnesium (5A06) was reinforced with 55 vol% unidirectional ultra-high modulus and highly graphitized carbon fiber (M40J) using pressure infiltration method. The effect of temperature on the bending strength of the C_f/Al composites was investigated from room temperature to 500 °C. The experimental results showed that the strength of M40J_f/5A06Al composites was not affected by temperature from room temperature to 200 °C. The bending strength of the composite at 300 °C was decreased by 30% compared with that at room temperature. In order to evaluate the extent of interface weakening, the length of fiber pullout was measured. The results showed that the pullout length reached the maximum at 300 and 500 °C, which indicated weak interface at the corresponding temperature. The DSC curve presented obvious heat absorption peak at around 300 °C, which may be attributed to the dissolution of the interfacial product β (Al₃Mg₂) phases at the C/Al interface. The bending fracture surfaces of the composites after three-point bending tests were observed by SEM, plastic-viscous flow of the matrix were observed at the samples tested at 500 °C. The predominant mechanisms for high-temperature damage of M40J_f/5A06Al composites are matrix softening caused by dislocation recovery and interface weakening caused by the dissolution of interfacial products.

Key words: Carbon fiber, Aluminum, Metal matrix composites, High-temperature properties, Fiber pullout length

Da-Guang Li, Guo-Qin Chen, Long-Tao Jiang, Xiu Lin, Gao-Hui Wu. Mechanical Property of M40J_f/5A06Al Composite at Elevated Temperatures[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(9): 1175-1182.

Figures/Tables 11

Table 1 Chemical composition of 5A06Al alloy (wt%)

Si	Fe	Cu	Mn	Mg	Zn	Ti	Al
0.4	0.4	0.1	0.5	6.5	0.2	0.02	Bal.

Fig. 1 Metallographic photographs of Cf/Al composites: a perpendicular to fiber; b parallel to fiber.

Fig. 2 a Interface area between the carbon fiber and the aluminum matrix; b bright-field image of β-Al3Mg2 phase; c SADP of the Al3Mg2 phase marked by the circle in Fig. 2b; d EDS result of the Al3Mg2 phase marked by the circle in Fig. 2b.

Fig. 3 Stress-displacement curve of the three-point bending test for Cf/Al composites at room temperature.

Fig. 4 Fracture surface of Cf/Al composites after three-point bending test at room temperature.

Fig. 5 Effect of temperature on the stress-displacement curve of the three-point bending test for Cf/Al composites.

Fig. 6 Effect of temperature on the bending strength and the f 0.5σ max values of Cf/Al composites

Fig. 7 a Effect of temperature on the fiber pullout of Cf/Al composites; b DSC curve for Cf/Al composites.

Fig. 8 Phase diagram of binary Al-Mg system (dashed line depicts Mg content in 5A06Al alloy).

Fig. 9 Fracture surface of Cf/Al composites after test at different temperatures: a room temperature; b 100 °C; c 200 °C; d 300 °C; e 400 °C; f 500 °C.

Fig. 10 a Fiber surface of the composites tested at 400 °C; b EDS result of the debris.

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