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Metallurgical and Materials Transactions A

, Volume 42, Issue 7, pp 1805–1814 | Cite as

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

  • Jeoung Han Kim
  • S. L. Semiatin
  • You Hwan Lee
  • Chong Soo Lee
Article

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.

Keywords

Titanium Alloy Flow Stress Flow Behavior Apparent Activation Energy Strain Rate Sensitivity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

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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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2010

Authors and Affiliations

  • Jeoung Han Kim
    • 1
    • 2
  • S. L. Semiatin
    • 3
  • You Hwan Lee
    • 4
  • Chong Soo Lee
    • 1
  1. 1.Department of Materials Science and EngineeringPohang University of Science and Technology (POSTECH)PohangKorea
  2. 2.Structural Materials DivisionKorea Institute of Materials ScienceChangwonKorea
  3. 3.Materials and Manufacturing DirectorateAir Force Research Laboratory, AFRL/RXLMWright-Patterson Air Force BaseUSA
  4. 4.Wire Rod Research GroupTechnical Research Laboratories, POSCOPohangKorea

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