High-strain-rate compression and fracture of B4C-aluminum cermets.

摘要

The compressive behavior of liquid-metal infiltrated boron carbide-aluminum cermets were studied as a function of strain rate, composition, and microstructure. Hopkinson split pressure bar (HSPB) and quasi-static compression tests were conducted using dumb-bell-shaped specimens. Results showed cermet compressive strength to be independent of loading rate. Strength was also found to be independent of the aluminum alloy used to infiltrate pre-sintered 65 vol % B(sub 4)C pre-forms. compositions with the smallest phase size displayed the best strength and ductility. 18 refs., 4 figs.