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Dynamic globularization behavior of O-phase lamellae in Ti-22Al-25Nb (at.%) alloy during deformation at elevated temperatures
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College of Materials Science and Engineering, Taiyuan University of Technology,,,,

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TG146.22

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    Abstract:

    To clarify the globularization mechanism and model of the O-phase lamellae of Ti2AlNb-based alloys during deformation at elevated temperatures, the hot deformation behavior and microstructure evolution of Ti-22Al-25Nb (at.%) alloy during hot compression deformation in (α2+O+B2) region were investigated. The results showed that the flow softening is relevant to the dynamic globularization of O-phase lamellae and the flow instability including 45° shear deformation, 45° shear cracking and micro-cracks. The deformation constitutive model based on the exponential law was established and the deformation activation energy was calculated to be 831 kJ?mol-1. The globularization of O-phase lamellae is hard to occur at low temperatures or at high strain rates due to slow diffusion rate or insufficient diffusion time. The main globularization mechanism is the kink and shear of the O-phase lamellae, which is confirmed to be a dynamic recrystallization behavior. The dynamic globularization kinetics was also studied, which is sensitive to deformation conditions including deformation temperatures and strain rates and follows an Avrami type sigmoid equation.

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[lin peng, tang tingting, chi chengzhong, zhang shuzhi, zhang changjiang. Dynamic globularization behavior of O-phase lamellae in Ti-22Al-25Nb (at.%) alloy during deformation at elevated temperatures[J]. Rare Metal Materials and Engineering,2018,47(2):416~422.]
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History
  • Received:February 29,2016
  • Revised:September 16,2016
  • Adopted:October 18,2016
  • Online: March 15,2018
  • Published: