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A Self-Consistent Approach for Modeling the Flow Behavior of the Alpha and Beta Phases in Ti-6Al-4V

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Abstract

The flow behavior of the α and β phases in Ti-6Al-4V was interpreted in the context of a self-consistent modeling formalism. For this purpose, high-temperature compression tests were conducted at various temperatures for a single-phase α alloy (Ti-7Al-1.5V), a variety of near-β alloys, and the two-phase alloy Ti-6Al-4V, each with an equiaxed microstructure. The flow behavior of the α phase in Ti-6Al-4V was deduced from the experimental results of the single-phase α alloy. The flow behavior of the β phase, which was predicted by using the self-consistent approach and the measured flow behaviors of Ti-6Al-4V and Ti-7Al-1.5V, showed good agreement with direct measurements of the various near-β alloys. From these results, it was shown that the strength of the α phase is approximately three times higher than that of the β phase at temperatures between 1088 K and 1223 K (815 °C and 950 °C). It was also concluded that the relative strain rates in the two phases varies significantly with temperature. The usefulness of the approach was confirmed by comparing the predicted and measured flow stresses for other Ti-6Al-4V and near-α alloys.

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Acknowledgments

The work was supported in part by the Air Force Office of Scientific Research and its Asian Office of Aerospace Research and Development (Dr. Ken Goretta and Dr. Joan Fuller, program managers). It was also conducted as a part of an in-house research project of Korea Institute of Materials Science.

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Author notes

  1. Jeoung Han Kim (Graduate Student)

    Present address: Structural Materials Division, Korea Institute of Materials Science, Changwon, 641-010, Korea

Authors and Affiliations

  1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea

    Jeoung Han Kim (Graduate Student) & Chong Soo Lee (Professor)

  2. Materials and Manufacturing Directorate, Air Force Research Laboratory, AFRL/RXLM, Wright-Patterson Air Force Base, OH, 45433-7817, USA

    S. L. Semiatin (Senior Scientist, Materials Processing/Processing Science)

  3. Wire Rod Research Group, Technical Research Laboratories, POSCO, Pohang, 790-784, Korea

    You Hwan Lee (Senior Researcher)

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  1. Jeoung Han Kim
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  2. S. L. Semiatin
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  4. Chong Soo Lee
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Corresponding author

Correspondence to Chong Soo Lee.

Additional information

Manuscript submitted October 27, 2009.

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Kim, J.H., Semiatin, S.L., Lee, Y.H. et al. A Self-Consistent Approach for Modeling the Flow Behavior of the Alpha and Beta Phases in Ti-6Al-4V. Metall Mater Trans A 42, 1805–1814 (2011). https://doi.org/10.1007/s11661-010-0567-x

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