|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Effect of Borides on the Beta/Alpha Phase Transformation Kinetics in Gamma Titanium Aluminide Alloys
||Michael Oehring, Andreas Stark, Marcus Rackel, Norbert Schell, Florian Pyczak
|On-Site Speaker (Planned)
Pronounced microstructural refinement can be achieved in gamma alloys by the addition of B, as it is known since about two decades. For beta solidifying alloys this effect is induced by the beta/alpha transformation and only observed for rather slow cooling rates. In order to understand the microstructural refinement the phase transformations kinetics was analyzed by in situ high-energy XRD on cooling the material from the high-temperature beta phase field. An inductively heated dilatometer was used for heating and cooling specimens of the alloys Ti-43Al-5Nb and Ti-43Al-5Nb-0.2B (at.%). The specimens were cooled to room temperature with several cooling rates from 1 K/s up to 30 K/s. The phase fractions were determined by HEXRD and in addition from the length signal measured by the dilatometer. The experiments indicate a change in the transformation mechanism between 5 K/s and 10 K/s the origin of which will be discussed in the contribution.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)