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Hot deformation characteristics of Ti-6Al-4V

  • L.X. Li , K.P. Rao EMAIL logo , Y. Lou and D.S. Peng
Published/Copyright: February 7, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 94 Issue 9

Abstract

The flow behavior and hot deformation mechanisms of Ti-6Al-4Vin both β and (α + β) phase regions have been studied by compression tests in the temperature range 750 – 1100 °C and strain rate range 0.05 –15 s –1. The flow curves displayed discontinuous yielding at temperatures above 850 °C and high strain rates, typically 5 and 15 s–1. Flow oscillations were also observed under such conditions. The relative discontinuous flow stress drop increased with increasing temperature in the (α + β) phase region and reached a steady state in the β phase region. The discontinuous yielding is attributed to the sudden increase in the mobile dislocation density occurring due to the activation of β grain boundary sources during hot deformation. The apparent activation energy estimated using the standard kinetic analysis is about 246 kJ/mol in the β region and 621 kJ/ mol in the (α + β) region while the strain rate sensitivity values are 0.34 and 0.18, respectively. The mechanism in the β region has been suggested to involve grain boundary sliding and dynamic recovery of the β phase while in the (α + β) region a transient mechanism, involving dynamic recovery followed by post deformation recrystallization, has been proposed.

Keywords: Ti-Al-Valloy; Hot compression; Discontinuous yielding; Microstructure; Deformation mechanisms
Dr. K.P. Rao Department of Manufacturing Engineering and Engineering Management City University of Hong Kong Tat Chee Avenue, Kowloon, Hong Kong Tel.: +852 27 88 84 09 Fax: +852 27 88 84 23

  1. Part of the work presented here was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. CityU 1086/98E). The authors would like to express their gratitude to Prof. Y.V.R.K. Prasad, Department of Metallurgy, Indian Institute of Science, Bangalore, India, for his valuable comments and suggestions during the preparation of this paper.

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Received: 2002-06-21
Published Online: 2022-02-07

© 2003 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. Bulk and grain boundary diffusion of Ag in γ-FeNi alloy
  4. Thermodynamics of ordered intermetallic compounds containing point defects
  5. Relationship between the sodium oxide activity of ceramic (Na-β + β″)-alumina and the sodium activity in the ambience of the material
  6. Calorimetric study of MgZn2 and Mg2Zn11
  7. The (γ + γ′)/γ′ phase boundary in the Ni–Al phase diagram from 600 to 1200 °C
  8. Experimental investigation and thermodynamic calculation of ternary Al–Ca–Mg phase equilibria
  9. Texture development in Al alloys during tensile testing
  10. Dispersion strengthening of copper by internal oxidation of rapidly solidified Cu-RE alloys
  11. The effect of Cu and Al on the mechanical properties of gravity-cast hyper-eutectic Zn–Al-based alloys
  12. Hot deformation characteristics of Ti-6Al-4V
  13. Effect of carbon and nitrogen on the stacking fault energy of high-alloyed iron-based austenite
  14. Influence of charged hydrogen on tensile behavior of a pressure vessel steel at relatively high temperatures
  15. The damping behavior of a Ni-50 at.%Ti shape memory alloy
  16. Development of SMD 32.768 kHz tuning fork-type crystals
  17. Investigation of the miscibility gap region in liquid Ga–Pb alloys
  18. Notifications/Mitteilungen
  19. Werner-Köster-Preis 2002
  20. Personal/Personelles
  21. Information
  22. Books/Bücher
  23. Conferences/Konferenzen
https://doi.org/10.1515/ijmr-2003-0182
Keywords for this article
Ti-Al-Valloy; Hot compression; Discontinuous yielding; Microstructure; Deformation mechanisms

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. Bulk and grain boundary diffusion of Ag in γ-FeNi alloy
  4. Thermodynamics of ordered intermetallic compounds containing point defects
  5. Relationship between the sodium oxide activity of ceramic (Na-β + β″)-alumina and the sodium activity in the ambience of the material
  6. Calorimetric study of MgZn2 and Mg2Zn11
  7. The (γ + γ′)/γ′ phase boundary in the Ni–Al phase diagram from 600 to 1200 °C
  8. Experimental investigation and thermodynamic calculation of ternary Al–Ca–Mg phase equilibria
  9. Texture development in Al alloys during tensile testing
  10. Dispersion strengthening of copper by internal oxidation of rapidly solidified Cu-RE alloys
  11. The effect of Cu and Al on the mechanical properties of gravity-cast hyper-eutectic Zn–Al-based alloys
  12. Hot deformation characteristics of Ti-6Al-4V
  13. Effect of carbon and nitrogen on the stacking fault energy of high-alloyed iron-based austenite
  14. Influence of charged hydrogen on tensile behavior of a pressure vessel steel at relatively high temperatures
  15. The damping behavior of a Ni-50 at.%Ti shape memory alloy
  16. Development of SMD 32.768 kHz tuning fork-type crystals
  17. Investigation of the miscibility gap region in liquid Ga–Pb alloys
  18. Notifications/Mitteilungen
  19. Werner-Köster-Preis 2002
  20. Personal/Personelles
  21. Information
  22. Books/Bücher
  23. Conferences/Konferenzen
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