Structure and properties of Ti–7.5Mo–xFe alloys

Abstract

The present work is a study of a series of Ti–7.5Mo–xFe alloys, with the focus on the effect of iron addition on the structure and mechanical properties of the alloys. Experimental results indicate that α″ phase-dominated binary Ti–7.5Mo alloy exhibited a fine, acicular martensitic structure. When 1wt% or more iron was added, the entire alloy became equi-axed β phase structure with a grain size decreasing with increasing iron content. Athermal ω phase was formed in the alloys containing iron of roughly between 0.5 and 3wt%. The largest quantity of ω phase and highest microhardness were found in Ti–7.5Mo–1Fe alloy. The binary Ti–7.5Mo alloy had a lower microhardness, bending strength and modulus than all iron-containing alloys. The largest bending strength was found in Ti–7.5Mo–2Fe alloy. The present alloys with iron contents of about 2–5wt% seem to have a great potential for use as an implant material.