Low-pressure processing and microstructural evaluation of unidirectional carbon fiber-reinforced aluminum-nickel matrix composites

Add time:08/17/2019    Source:sciencedirect.com

Continuous carbon fiber-reinforced aluminum-nickel matrix composites were manufactured by immersion of an interlayered layup design of aluminum foils, nickel mesh strips and nickel-coated carbon fibers in an aluminum melt at 900 °C for 15 s. Samples with and without fibers were compared. Scanning electron microscopy (SEM) revealed a strong bond at the matrix/reinforcement interface, indicated through no defects and no sign of debonding. Light microscopy (LM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and Vickers microhardness tests indicated the presence of Ni2Al3 and NiAl intermetallic phases in the composite, with hardness of 970 ± 27 and 450 ± 23 HV respectively, in agreement with values on reactive diffusion reported in literature. Microstructural analysis of the interfacial region and image binarization suggested an achievable fiber content between 15% and 40% vol, as well as a potential interface improvement by further homogenization of the fiber distribution.

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