|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||Suppression of ω-phase Formation in Prototypical Metastable β-Ti Alloys
||Martin Luckabauer, Florian Brumbauer, Wolfgang Sprengel, Norihiko L Okamoto, Tetsu Ichitsubo
|On-Site Speaker (Planned)
A critical characteristic of metastable β-Ti alloys is the inevitable formation of ω precipitates during certain heat treatments which leads to embrittlement, or even to a complete loss of ductility. In this work Sn an element known to influence the ω-phase formation was introduced into a β-Ti-Cr alloy to study its influence on the ω-phase formation kinetics in-situ by means of a unique high-precision laser dilatometer. Two Ti-Cr alloys, with and without the addition of Sn which were subjected to similar heat treatments consisting of solution annealing, quenching and subsequent isothermal ageing at various temperatures were studied. For the Ti-Cr alloy, the expected extensive formation of isothermal ω-phase at 250°C was observed. In contrast the addition of 3at% Sn to the alloy decreased the formation rate by more than three orders of magnitude, allowing for a time-temperature processing envelope compatible with all established additive manufacturing techniques.
||Phase Transformations, Characterization,