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Hot Tensile Behavior and Self-consistent Constitutive Modeling of TA15 Titanium Alloy Sheets

Abstract

Hot tensile behavior of TA15 sheets with bimodal microstructure was studied through tensile tests from 750 to 850 °C with an interval of 25 °C and at strain rates of 0.001, 0.01, and 0.1 s−1. Results of the tensile tests reveal that the flow stress reaches peak values at specific strains, and then softening or steady-state flow occurs. Metallographic examination of deformed specimens shows that the primary α-phase becomes equiaxed, while the secondary α-phase and the lamellar β-phase are curved until crushed, indicating that the deformation occurred mainly in the secondary α-phase and the lamellar β-phase. A self-consistent model was developed to predict the plastic flow behavior of the TA15 sheets. Model parameters were determined according to the composition contents of individual phases and the stress-strain curves. The stress-strain curves at 775 °C and at the strain rates of 0.001, 0.01, and 0.1 s−1 were predicted by the proposed model, showing good agreement with the experimental results.

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Acknowledgments

The authors acknowledge the support of the Beijing Laboratory of Metallic Materials and Processing for Modern Transportation. Helpful discussions with Prof. Jianguo Lin and Dr. Qian Bai of Imperial College and Dr. Kehuan Wang and Yong Wu of Harbin Institute of Technology are also greatly appreciated.

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Correspondence to Baoyu Wang.

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Yang, L., Wang, B., Liu, G. et al. Hot Tensile Behavior and Self-consistent Constitutive Modeling of TA15 Titanium Alloy Sheets. J. of Materi Eng and Perform 24, 4647–4655 (2015). https://doi.org/10.1007/s11665-015-1784-7

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Keywords

  • bimodal microstructure
  • flow stress
  • hot tensile behavior
  • self-consistent constitutive
  • TA15 alloy