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

机译：Ti-22Al-25Nb合金热变形行为的加工图和动力学分析

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摘要

To study the hot deformation behavior of the Ti-22Al-25Nb alloy, isothermal compression tests were conducted at the temperature range of 930-1080 ℃ 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.
机译：为了研究Ti-22Al-25Nb合金的热变形行为，在930-1080℃的温度范围内进行了等温压缩试验，应变速率为0.001-1.0 s〜（-1）。应变速率和变形温度都对Ti-22Al-25Nb合金的应力-应变行为有重要影响。建立了一个双曲正弦本构方程，定量地证明了所涉及参数之间的关系，热变形活化能Q被确定为621 kJ / mol。为了优化加工窗口，建立了一个热加工图，该图与热加工中的微观组织演变有关。层状球状化以及动态再结晶（DRX）将有助于高功率耗散的稳定区域，而绝热剪切带将导致不稳定区域。此外，使用Avrami型动力学模型检查等温变形过程中DRX的演化。

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  • 来源
    《Journal of Materials Research》 |2016年第12期|1764-1772|共9页
  • 作者

    He Zhang; Huijun Li; Qianyin Guo; Yongchang Liu; Liming Yu;

  • 作者单位

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People's Republic of China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People's Republic of China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People's Republic of China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People's Republic of China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300354, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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