Materials Transactions Online

Materials Transactions, Vol.50 No.01 (2009) pp.101-110
© 2009 The Japan Institute of Metals

Partial Grain Refinement in Al-3%Cu Alloy during ECAP at Elevated Temperatures

Inna Mazurina1, Taku Sakai1, Hiromi Miura1, Oleg Sitdikov1,2 and Rustam Kaibyshev3

1Department of Mechanical Engineering and Intelligent Systems, UEC Tokyo (The University of Electro-Communications), Tokyo 182-8585, Japan
2Institute for Metals Superplasticity Problems, Khalturina 39, Ufa 450001, Russia
3Belgorod State University, Belgorod 308034, Russia

Microstructural changes during equal channel angular pressing (ECAP) in a temperature interval from 523 to 748 K (∼0.6–0.8 Tm) were studied in a coarse-grained binary aluminum alloy Al-3%Cu. Hot ECAP results in grain refinement taking place at all temperatures investigated, leading to a non-uniform development of deformation-induced fine grains and the remnant original grains containing subgrains with low-angle boundaries. Fine-grained structure is developed along microshear bands formed in grain interiors as well as along initial grain boundaries. The number and the average misorientation angle of the boundaries of microshear bands start to increase at above a critical strain of about 2, finally leading to development of new fine-grained structures. The volume fraction and the average misorientation of deformation-induced boundaries are reduced with rising temperature. The thermal stability of the evolved deformation microstructures and several factors controlling grain refinement during hot ECAP are discussed in details.

(Received 2008/6/2; Accepted 2008/8/1; Published 2008/9/18)

Keywords: grain refinement, temperature effect, microshear band, equal channel angular pressing (ECAP), aluminum alloy

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REFERENCES

  1. R. Z. Valiev, R. K. Islamgaliev and I. V. Alexandrov: Progr. Mater. Sci. 45 (2000) 103–189.
  2. Y. Iwahashi, Z. Horita, M. Nemoto and T. G. Langdon: Acta Mater. 45 (1997) 4733–4741.
  3. F. J. Humphreys, P. B. Prangnell, J. R. Bowen, A. Gholinia and C. Harris: Phil. Trans. R. Soc. A 357 (1999) 1663–1681.
  4. J. P. Bowen, P. B. Prangnell and F. J. Humphreys: Proc. 20th Risø International Symposium, ed. by J. B. Bilde-Sørensen, J. V. Carstensen, N. Hansen, D. Juul Jensen, T. Leffers, W. Pantleon, O. B. Pedersen and G. Winther, (Risø Lab., Roskilde, Denmark, 1999), p.269.
  5. A. Yamashita, D. Yamaguchi, Z. Horita and T. G. Langdon: Mat. Sci. Eng. A 287 (2000) 100–106.
  6. C. Pithan, T. Hashimoto, M. Kawazoe, J. Nagahora and K. Higashi: Mat. Sci. Eng. A 280 (2000) 62–68.
  7. J. Y. Chang, J. S. Yoon and G. H. Kim: Scr. Mater. 45 (2001) 347–354.
  8. U. Chakkingal and P. F. Thomson: J. Mater. Proc. Tech. 117 (2001) 169–177.
  9. A. Goloborodko, O. Sitdikov, T. Sakai, R. Kaibyshev and H. Miura: Mater. Trans. 44 (2003) 766–774.
  10. Y. C. Chen, Y. Y. Huang, C. P. Chang and P. W. Kao: Acta Mater. 51 (2003) 2005–2015.
  11. P. J. Apps, J. R. Bowen and P. B. Prangnell: Acta Mater. 51 (2003) 2811–2822.
  12. A. Goloborodko, O. Sitdikov, R. Kaibyshev, H. Miura and T. Sakai: Mat. Sci. Eng. A 381 (2004) 121–128.
  13. M. Popovic and B. Verlinden: Mater. Sci. Technol. 21 (2005) 606–612.
  14. P. J. Apps, M. Berta and P. B. Pragnell: Acta Mater. 53 (2005) 499–511.
  15. Z. Zhang, S. Hosoda, I.-S. Kim and Y. Watanabe: Mater. Sci. Eng. A 425 (2006) 55–63.
  16. O. Sitdikov, T. Sakai, E. Avtokratova, R. Kaibyshev, Y. Kimura and K. Tsuzaki: Mat. Sci. Eng. A 444 (2007) 18–30.
  17. J. Gubicza, I. Schiller, N. Q. Chinh, J. Illy, Z. Horita and T. G. Langdon: Mat. Sci. Eng. A 460–461 (2007) 77–85.
  18. O. Sitdikov, T. Sakai, E. Avtokratova, R. Kaibyshev, K. Tsuzaki and Y. Watanabe: Acta Mater. 56 (2008) 821–834.
  19. I. Mazurina, T. Sakai, H. Miura, O. Sitdikov and R. Kaibyshev: Mat. Sci. Eng. A 473 (2008) 297–305.
  20. I. Mazurina, T. Sakai, H. Miura, O. Sitdikov and R. Kaibyshev: Mat. Sci. Eng. A 486 (2008) 662–671.
  21. R. Z. Valiev, Y. V. Ivanisenko, E. F. Rauch and B. Baudelet: Acta Mater. 44 (1996) 4705–4712.
  22. A. Belyakov, T. Sakai, H. Miura and K. Tsuzaki: Phil. Mag. A 81 (2001) 2629–2643.
  23. R. M. Imaev, G. A. Salishchev, O. N. Senkov, V. M. Imayev, M. R. Shagiev, N. K. Gabdullin, A. V. Kuznetsov and F. H. Froes: Mater. Sci. Eng. A 300 (2001) 263–277.
  24. O. Sitdikov, T. Sakai, A. Goloborodko and H. Miura: Scripta Mat. 51 (2004) 175–179.
  25. O. Sitdikov, T. Sakai, A. Goloborodko, H. Miura and R. Kaibyshev: Phil. Mag. 85 (2005) 1159–1175.
  26. S. Ringeval, D. Piot, C. Desrayaud and J. H. Driver: Acta Mater. 54 (2006) 3095–3105.
  27. C. Kobayashi, T. Sakai, A. Belyakov and H. Miura: Phil. Mag. Lett. 87 (2007) 751–766.
  28. T. Sakai, A. Belyakov and H. Miura: Met. Mat. Trans. 39A (2008) 2206–2214. doi: 10.1007/s11661-008-9556-8.
  29. Metals Handbook: Metallography, Structures and Phase Diagrams, ed. by T. Lyman (American Society of Metals, 8, 1973) pp.163–168.
  30. P. J. Hurley and F. J. Humphreys: Acta Mater. 51 (2003) 1087–1102.
  31. F. J. Humphreys and M. Hatherly: Recrystallization and Related Annealing Phenomena, 2nd Edition, (Elsevier, 2004) pp.451–467.
  32. E. Ball and F. J. Humphreys: Thermomechanical Processing (TMP2), ed. by W. B. Hutchinson, et al., (ASM, Ohio, 1996) pp.184.
  33. A. Duckham, R. D. Knutsen and O. Engler: Acta Mater. 49 (2001) 2739–2749.

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