Research on Microstructure and Mechanical Properties of B₄C/Al Composites by Liquid Mental Mixing

Abstract:

B₄C/Al composites of different boron carbide contenting were prepared by the liquid mixing method and hot-rolled to 3mm. Microstructure and mechanical properties of the rolled composite were analyzed after the stress relieving heat treatment. Results showed that: the distribution of boron carbide particles was uniform, and only a few particles appeared fractured. With Ti addition, a reaction product layer was fabricated surrounding B₄C particles, which acted as a diffusion barrier to separate B₄C particles from liquid aluminum to protect them. With the mass fraction of the B₄C particles increasing, it can improve the tensile strength but degrade the plasticity of the composites. The fracture surface of composites showed both ductile and brittle fracture characteristics and when the mass fraction of the B₄C particles increased the ductile fracture feature decreased.

• Periodical: Applied Mechanics and Materials (Volume 703)
• Pages: 9-16
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.703.9
• Online since: December 2014
• Authors: Dong Li, Qiu Lin Li, Xue Jun Li, Wei Liu
• Keywords: B₄C/Al Composites, Brittle Fracture, Ductile Fracture, Liquid Metal Mixing Method, Mechanical Property, Microstructure

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