BENDING STRENGTH OF HYDROGEN-CHARGED TI-13V-11CR-3AL ALLOY

Bending tests were carried out on a Ti-13V-11Cr-3Al alloy which was charged with hydrogen by an electrolytic method and a high-temperature high-pressure H-2 gas method. Bending strengths sigma-b of as-solution treated specimens as well as aged specimens decreased with increase in electrolytic hydrogen charging time. The decrease in sigma-b was small when the charging current density i(c) was 500 A/m2, while it was large when i(c) were 1000 A/m2 and 3000 A/m2. The bending strength of the specimens charged with hydrogen at high temperatures and high pressures decreased with increase in hydrogen concentration in specimens. X-ray diffraction analysis of the fracture surface showed that the decrease in sigma-b by the hydrogen charging was caused by a decrease in cleavage strength of the (100) plane due to the resolution of hydrogen atoms into metal.