Abstract
In this study, Ti-15Mo alloy powder was prepared by gas atomization and subsequent cryogenic milling in order to achieve ultra-fine grained microstructure. Both milled and non-milled powders were compacted by spark plasma sintering (SPS) at temperature of 800 °C for different sintering times up to 6 minutes. Sintering temperature and time affect porosity, microstructure and phase composition of the alloy. Milled powder can be sintered at comparatively lower temperature to achieve fully dense material. Sintering below β-transus temperature results in α+β-structure. Furthermore, amount of α-phase is higher in the material sintered from the milled powder due to increased oxygen content and also due to refined microstructure which facilitates α-phase precipitation. Mechanical properties are also affected by formation of ω-phase during uncontrolled cooling in the SPS machine.
Highlights
Titanium and its alloys are perspective for their unique properties such as low density, high strength or good biocompatibility in comparison with steels [1], [2]
In this study we focus on a very different powder metallurgy (PM) process of spark plasma sintering (SPS) which was applied for the first time on a metastable Ti-15Mo alloy
Initial powder particles are in a shape of ball with size of around 20 μm
Summary
Titanium and its alloys are perspective for their unique properties such as low density, high strength or good biocompatibility in comparison with steels [1], [2]. They are nowadays commonly used in aircraft industry or in biomedicine. Fabrication of titanium alloys by powder metallurgy (PM) is currently a hot-topic as it is able to reduce production costs by possibility of near-net-shape processing. Another advantage of PM is possibility of alloys production by mechanical alloying [3]. The times and temperatures required for compaction via SPS are lower in comparison with other compaction methods such as conventional sintering
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
