Bulks of Al-B-C obtained by reactively spark plasma sintering and impact properties by Split Hopkinson Pressure Bar.

ABSTRACT: Mixtures of B₄C, α-AlB₁₂ and B powders were reactively spark plasma sintered at 1800 °C. Crystalline and amorphous boron powders were used. Samples were tested for their impact behavior by the Split Hopkinson Pressure Bar method. When the ratio R = B₄C/α-AlB₁₂ ≥ 1.3 for a constant B-amount, the major phase in the samples was the orthorhombic AlB₂₄C₄, and when R < 1 the amount of AlB₂₄C₄ significantly decreased. Predictions that AlB₂₄C₄ has the best mechanical impact properties since it is the most compact and close to the ideal cubic packing among the Al-B-C phases containing B₁₂-type icosahedra were partially confirmed. Namely, the highest values of the Vickers hardness

SUBMITTER: Vasylkiv O 

PROVIDER: S-EPMC6925236 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature