TY - JOUR
T1 - Dynamic recrystallization behavior of the Ti–48Al–2Cr–2Nb alloy during isothermal hot deformation
AU - Chen, Xiaofei
AU - Tang, Bin
AU - Liu, Yan
AU - Xue, Xiangyi
AU - Li, Lei
AU - Kou, Hongchao
AU - Li, Jinshan
N1 - Publisher Copyright:
© 2019 Chinese Materials Research Society
PY - 2019/10
Y1 - 2019/10
N2 - The hot deformation behavior of the as-cast Ti–48Al–2Cr–2Nb alloy was investigated by isothermal compression tests at deformation temperatures ranging from 1000 °C to 1200 °C, and strain rates from 0.001 s−1 to 0.1 s−1. The single peak stress features common to all flow curves indicate that DRX is the dominating softening mechanism. The calculated values of the hot deformation activation energy Q and stress index n are 296.5 kJ mol−1 and 3.97, respectively. Based on this, the Arrhenius type constitutive equation was successfully established. The DRX critical condition model and relationship among DRX volume fractions, deformation temperatures and strain rates were obtained to optimize the process. Combined with microstructure analysis, it's concluded that 1200 °C/0.01s−1 is the optimization parameter. Besides, both DDRX and CDRX were observed in the γ phase evolution. The deformation mechanism from the inter-grain dislocation motion to the grain boundary migration and grain rotation was discussed.
AB - The hot deformation behavior of the as-cast Ti–48Al–2Cr–2Nb alloy was investigated by isothermal compression tests at deformation temperatures ranging from 1000 °C to 1200 °C, and strain rates from 0.001 s−1 to 0.1 s−1. The single peak stress features common to all flow curves indicate that DRX is the dominating softening mechanism. The calculated values of the hot deformation activation energy Q and stress index n are 296.5 kJ mol−1 and 3.97, respectively. Based on this, the Arrhenius type constitutive equation was successfully established. The DRX critical condition model and relationship among DRX volume fractions, deformation temperatures and strain rates were obtained to optimize the process. Combined with microstructure analysis, it's concluded that 1200 °C/0.01s−1 is the optimization parameter. Besides, both DDRX and CDRX were observed in the γ phase evolution. The deformation mechanism from the inter-grain dislocation motion to the grain boundary migration and grain rotation was discussed.
KW - Constitutive equation
KW - Dynamic recrystallization
KW - Microstructure
KW - TiAl alloys
UR - http://www.scopus.com/inward/record.url?scp=85072765887&partnerID=8YFLogxK
U2 - 10.1016/j.pnsc.2019.08.004
DO - 10.1016/j.pnsc.2019.08.004
M3 - 文章
AN - SCOPUS:85072765887
SN - 1002-0071
VL - 29
SP - 587
EP - 594
JO - Progress in Natural Science: Materials International
JF - Progress in Natural Science: Materials International
IS - 5
ER -