|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Seeded Growth of Ti-46Al-(3~10)Nb PST Crystals
||Hao Jin, Ronghua Liu, Yuyou Cui, Quangang Xian, Dongsheng Xu, Rui Yang
|On-Site Speaker (Planned)
Mechanical properties of TiAl-Nb alloys could be improved significantly if PST crystals of these alloys with lamellae parallel to the crystal growth direction could be obtained. This paper summarizes our recent work on growth of Ti-46Al-(3~10)Nb alloy utilizing a Ti-43Al-3Si seed in an optical floating zone furnace. For all amount of addition, the lamellar orientations of Ti-46Al-xNb alloys were successfully controlled. As to Ti-46Al-3Nb alloy, stray grains tend to form after about 40mm. For alloys with Nb addition large than 5%, the main grain could occupy a dominant position in the whole bar. A model was construct to explain the results based on phase diagrams and thermodynamics. For alloys with Nb addition less than 10%, room temperature tensile elongations of 10% were typically obtained. As to Ti-46Al-10Nb alloy, B2 phase may be the reason for its low ductility. The highest elongation of 18% has been obtained for Ti-46Al-8Nb alloy.
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