A Comparison between B₄C-ZrB₂-Al Composite and B₄C-Al Composite on Microstructure and Mechanical Properties

Abstract:

B₄C-Al and B₄C-ZrB₂-Al composites were fabricated by infiltrating aluminum into porous B₄C and B₄C-ZrB₂ preforms in vacuum. The effect of ZrB₂ addition on the microstucture and mechanical properties of the B₄C-Al composites were investigated. The flexural strength and the fracture toughness of composite improved greatly as the result of ZrB₂ addition. The ZrB₂ addition inhibited the reaction between B₄C and Al. The infiltrated aluminum addition was the leading reason for the fracture toughness improvement of the composites. Inter/transgranular fracture mode with many tear ridges and dimples was showing in the fracture surface of the B₄C-ZrB₂-Al composite. The relationships between the microstructures and the mechanical properties of the B₄C-ZrB₂-Al composites were discussed.

• Periodical: Advanced Materials Research (Volume 279)
• Pages: 71-76
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.279.71
• Online since: July 2011
• Authors: Peng Lü
• Keywords: B₄C-Al, B₄C-ZrB₂-Al, Microstructure, Vacuum Infiltration

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