Abstract
Abstract The wettability of 2519Al on boron carbide (B 4 C) was investigated in detail by an improved sessile-drop method at temperature ranging from 1000 to 1250 °C. The interface reactions of B 4 C–2519Al systems were analyzed by means of scanning electron microscopy (SEM), electron probe X-Ray microanalysis (EPMA) and X-ray diffraction (XRD). Typical flexural strength and hardness of infiltrated B 4 C–2519Al composites were studied by three-point-bending tests and Rockwell hardness tester. It is found that the wettability and interaction between molten 2519Al alloy and B 4 C are sensitive to the temperature and contact time. The contact angles significantly decreased and the solid–liquid interaction was more intense as the temperature increased. On the other hand, the formation of various compounds such as Al 3 BC, Al 3 B 48 C 2 and AlB 2 was identified. Some Al 2 Cu and Al 3 Zr phases appeared in the 2519Al drop during cooling, while AlB 2 precipitated far away from the 2519Al/B 4 C interface. Ternary compounds of Al 3 BC and Al 3 B 48 C 2 , formed along the interface, play a key role in the improvement of wettability of B 4 C/2519Al. For infiltrated 2519Al–B 4 C composites, the typical bending strength and HRA are 300.71 MPa and 80.3, respectively. The main fracture way of infiltrated B 4 C/2519Al is transgranular rupture, which has smooth fracture surface and intrinsic brittle fracture mode.
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