Internal friction in titanium and titanium-oxygen alloys

Abstract

A low-frequency torsional pendulum technique has been used to study internal friction in alpha-titanium and in some titanium-oxygen alpha-solid-solutions containing up to 4.5 atomic per cent oxygen. Characteristic grain-boundary relaxation peaks are exhibited by the pure titanium and by the alloys; the respective heats of activation were found to be 46,000 cal/mol and 75,000 cal/mol. The introduction of oxygen results in the appearance of an additional relaxation peak at approximately 700°K; the mechanism involved is not established but the associated heat of activation is estimated as 48,000 cal/mol.