Manufacturing of biomedical Ti alloys with controlled oxygen content by blended elemental powder metallurgy
Abstract
Biomedical Ti-xNb-7Zr-0.7O (wt%) alloys were manufactured from elemental powders and controlled ad-dition of TiO2 using field assisted sintering technique (FAST). First, sintering parameters were optimized on the benchmark Ti-29Nb-7Zr-0.7O alloy.
Second, alloys with various content of Nb (20, 23, 26 and 29 wt%) were manufactured. FAST is capable to produce homogeneous material with controlled amount of oxygen.
In addition, FAST is a valuable method for fast sampling of alloys with different compositions. Detailed XRD and SEM study proved that oxygen prevents formation of alpha " martensite phase.
Presence of alpha phase, alpha' phase and especially omega phase causes an increase of elastic modulus and microhardness. Single phase beta Ti-29Nb-7Zr-0.7O alloy can be manufactured by FAST from elemental powders and subsequent solution treatment.
The alloy is proposed for biomedical use due to its low elastic modulus. (C) 2022 Elsevier B.V. All rights reserved.