TY - JOUR
T1 - Hot Workability and Superplasticity of Low-Al and High-Nb Containing TiAl Alloys
AU - Tang, Bin
AU - Zhao, Fengtong
AU - Chu, Yudong
AU - Kou, Hongchao
AU - Li, Jinshan
N1 - Publisher Copyright:
© 2017, The Minerals, Metals & Materials Society.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - The superplastic deformation mechanism of low-Al and high-Nb containing TiAl alloy was investigated in compression mode. The experimental results showed that intense dynamic recrystallization (DRX) breaks the balance and leads to a significant drop in flow stress after the peak when deforming below 950°C. Arrhenius kinetic analysis revealed that the activation energy for superplastic compression first increased then decreased with temperature, suggesting a change in the deformation mechanism. Microstructure observations showed that, when deformed at 850°C, the deformation mechanism was grain-boundary sliding accommodated by γ-DRX, γ-intragranular deformation, and β/B2-phase decomposition, while the mechanism was grain-boundary sliding accommodated by γ-DRX, β/B2-DRX, and γ → β/B2 + α2 phase transformation when deformed at 1000°C. After compression, the microstructure tended to be uniform, which may yield important information for the development of new deformation techniques for TiAl alloys.
AB - The superplastic deformation mechanism of low-Al and high-Nb containing TiAl alloy was investigated in compression mode. The experimental results showed that intense dynamic recrystallization (DRX) breaks the balance and leads to a significant drop in flow stress after the peak when deforming below 950°C. Arrhenius kinetic analysis revealed that the activation energy for superplastic compression first increased then decreased with temperature, suggesting a change in the deformation mechanism. Microstructure observations showed that, when deformed at 850°C, the deformation mechanism was grain-boundary sliding accommodated by γ-DRX, γ-intragranular deformation, and β/B2-phase decomposition, while the mechanism was grain-boundary sliding accommodated by γ-DRX, β/B2-DRX, and γ → β/B2 + α2 phase transformation when deformed at 1000°C. After compression, the microstructure tended to be uniform, which may yield important information for the development of new deformation techniques for TiAl alloys.
UR - http://www.scopus.com/inward/record.url?scp=85028976247&partnerID=8YFLogxK
U2 - 10.1007/s11837-017-2576-3
DO - 10.1007/s11837-017-2576-3
M3 - 文章
AN - SCOPUS:85028976247
SN - 1047-4838
VL - 69
SP - 2610
EP - 2614
JO - JOM
JF - JOM
IS - 12
ER -