Hot-Pressing and Properties of Be4B

Abstract

Be₄B was hot-pressed to theoretical density at 1030 deg C and 3000 psi. It contained 5% impurities, mainly BeO and Be, which accounted for the high density (1.96 vs 1.94 g/cm/sup a/ theoretical). The various phases in its microstructure were analyzed. The average grain diameter was 17 mu m, with a distribution from 5 to 31 mu m. Microhardness was measured to be 1350 kg/mm/sup 2/; the average modulus of rupture and the elastic modulus were 25,608 plus or minus 3,000 and 34.5 x 10/sup 6/ psi, respectively. (DLC)