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Hot deformation behavior of Ti–22Al–25Nb alloy by processing maps and kinetic analysis

Published online by Cambridge University Press:  30 May 2016

He Zhang ,
Huijun Li ,
Qianyin Guo ,
Yongchang Liu  and
Liming Yu
He Zhang
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People's Republic of China
Huijun Li
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People's Republic of China
Qianyin Guo
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People's Republic of China
Yongchang Liu*
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People's Republic of China
Liming Yu
Affiliation:
State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People's Republic of China
*
a)Address all correspondence to this author. e-mail: licmtju@163.com
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Abstract

To study the hot deformation behavior of the Ti–22Al–25Nb alloy, isothermal compression tests were conducted at the temperature range of 930–1080 °C with strain rates of 0.001–1.0 s−1. Both the strain rate and the deformation temperature have a significant influence on the stress–strain behavior of the Ti–22Al–25Nb alloy. A hyperbolic–sine constitutive equation is established to quantitatively demonstrate the relationship between the parameters involved, and the hot deformation activation energy Q is determined as 621 kJ/mol. To optimize the processing window, a hot processing map is established, which is related to the microstructure evolution in hot working. The lamellar globularization as well as the dynamic recrystallization (DRX) would contribute to the stable regions with high power dissipation, while the adiabatic shear bands would lead to unstable regions. Moreover, an Avrami-type kinetics model is applied to examine the evolution of DRX during isothermal deformation process.

Keywords

Ti–22Al–25Nb alloyhot deformationconstitutive equationprocessing mapdynamic recrystallizationkinetics model
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 12 , 28 June 2016 , pp. 1764 - 1772
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Copyright
Copyright © Materials Research Society 2016 

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