|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||F-48: Gamma Phase Nucleation from Stacking Fault in TiAl Alloys
||Chunyu Teng, Yonghong Li, Zhanyong Ren, Dongsheng Xu, Rui Yang
|On-Site Speaker (Planned)
The best combination of strength and stability in TiAl alloys can be obtained by forming structures with small lath thickness and high twin boundary frequency in the lamellae. Some experimental investigation show that introducing (complex) stacking fault in the matrix of the alpha2 phase may form the nucleation sites of lamellae. In order to understand how the (complex) stacking fault affecting gamma phase nucleation in TiAl alloys, a phase field model is introduced to simulate the gamma phase nucleation under the influence of different factors, such as (complex) stacking fault density, size and configuration, chemical driving force magnitude, etc.. The results show that a (complex) stacking fault can act as the preferred gamma phase nucleation site. The gamma phase nucleation energy barrier is reduced by the (complex) stacking fault dramatically. Therefore, the lamellar structure with small lath thickness and high twin boundary frequency is preferred.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)