Properties of Powder Metallurgy‐Fabricated Oxygen‐Containing Beta Ti–Nb–Mo–Sn–Fe Alloys for Biomedical Applications

Abstract

The influence of minor oxygen additions on the microstructure and mechanical properties of powder metallurgy (PM) fabricated Ti–25Nb–5Mo–3Sn–2Fe alloy is studied. The results demonstrate the positive influence of a certain oxygen content (0.35 wt%) on the microstructure and mechanical properties of sintered samples. Despite the presence of 7.0% porosity in the PM‐fabricated samples of Ti–25Nb–5Mo–3Sn–2Fe–0.35O, a high strength of 682 MPa, elongation of 7.2%, and Young's modulus of 74 GPa are obtained. The strength‐to‐modulus ratio of this alloy is higher than most common Ti biomedical alloys, indicating that this alloy may have better suitability for orthopedic applications. Deviation in the oxygen content of the alloy from 0.35 wt% negatively impacts on the ductility of the samples.

A compilation of experimental data on the mechanical properties and microstructural features of Ti-alloys

“…We double-checked these records and concluded that the oxygen contents in Xu et al . 27 were indeed reported right; these specific studies are simply unusual, with relatively high oxygen additions 28 . Entries with extreme elongation were associated with specimens that did not fracture during mechanical testing; deformation at rupture values from these studies 25 , 29 – 32 were set to a maximum of ±50%.…”

One-Step Enameling and Sintering of Low-Carbon Steels

“…Metal powders can be pre-alloyed [44,45] or mechanically alloyed [34,46]; it depends on the application sought. PM seeks added value for use on an industrial scale, such as biomedical implants using wear-resistant titanium alloys [47][48][49] or in the manufacture of hard metals for cutting tools or coatings [50]. Currently, one of its main applications is in the automotive industry for the manufacturing of small and complex components.…”