|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Mechanical Behavior and Microstructure Evolution of Fine-grained High Nb Containing TiAl Alloy under Isothermal Compression
||Yudong Chu, Jinshan Li, Bin Tang, Hongchao Kou
|On-Site Speaker (Planned)
Isothermal compression tests of a high Nb containing TiAl alloys with fine (α<SUB>2</SUB>+γ) microstructure and (β+γ) microstructure, Ti-43Al-8Nb-(W,B,Y), were carried out at the temperature 1000℃ with low strain rates 10<SUP>-4</SUP>S<SUP>-1</SUP> and 10<SUP>-3</SUP>S<SUP>-1</SUP>. SEM, EBSD and TEM were employed to investigate the microstructure characteristic. The results show that the TiAl alloys with two different microstructures exhibit the same characteristics that, when the alloys were deformed at 10<SUP>-3</SUP>S<SUP>-1</SUP>, severe γ grain refinement occured and the fraction of low-angle grain boundary of γ grain significantly increased. When the alloys were deformed at 10<SUP>-4</SUP>S<SUP>-1</SUP>, γ grain was slightly refined and more uniform, grain boundary characteristics of γ grain was stable. Moreover, according to investigation by TEM, it is believed that the dislocation slip and twinning in the interior of initial γ grain was responsible for the deformation at 10<SUP>-3</SUP>S<SUP>-1</SUP>. The grain boundary sliding between γ grains was responsible for the deformation at 10<SUP>-4</SUP>S<SUP>-1</SUP>.
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