Texture Weakening and Grain Refinement by High Speed Rolling and Annealing of an AZ31 Magnesium Alloy

Conference paper
First Online:
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

High-speed rolling of 1000 m/min has been used to produce Mg AZ31 alloy sheets at an initial temperature of 100 °C with increasing reductions to generate different as-rolled microstructures. After a reduction of 30%, a heavily twinned and shear-banded microstructure was seen, while after a reduction of 49%, a partially dynamically recrystallized (DRXed) and twinned microstructure was observed. The as-rolled specimens were then annealed at temperatures from 200 to 500 °C. Texture weakening and grain refinement were achieved at both reductions during annealing by static recrystallization (SRX). However, the 49% reduction specimen showed a much higher kinetics of SRX and a higher rate of texture weakening, comparing to the 30% reduction specimen. The weakest texture achieved in the former was slightly lower than that in the latter, which indicates that texture weakening is more effective in the specimen with heavily twinned and shear-banded microstructure than that with partially DRXed and twinned microstructure. Nevertheless, the average size of the SRXed grains at the full recrystallization condition of the specimen after the reduction of 49% was only half of that after 30%.

Keywords

High speed rolling Dynamic recrystallization Static recrystallization Texture weakening 
This is a preview of subscription content, log in to check access.

References

  1. 1.
    A.A. Luo, Applications: aerospace, automotive and other structural applications of magnesium, in Fundamentals of Magnesium Alloy Metallurgy, ed. by M.O. Pekguleryuz, K.U. Kainer, A.A. Kaya (Woodhead Publishing Limited, 2013), pp. 266–316Google Scholar
  2. 2.
    A.A. Luo, A.K. Sachdev, Applications of magnesium alloys in automotive engineering, in Advances in Wrought Magnesium Alloys Fundamentals of Processing, Properties and Applications, ed. by C. Bettles, M. Barnett (Woodhead Publishing Limited, 2012)Google Scholar
  3. 3.
    A.I. Taub et al., The evolution of technology for materials processing over the last 50 years: the automotive example. J. Met. 59(2), 48–57 (2007)Google Scholar
  4. 4.
    M.O. Pekguleryuz, Current developments in wrought magnesium alloys, in Advances in Wrought Magnesium Alloys Fundamentals of Processing, Properties and Applications, ed. by C. Bettles, M. Barnett (Woodhead Publishing Limited, 2012)Google Scholar
  5. 5.
    S.R. Agnew, M.H. Yoo, C.N. Tomé, Application of texture simulation to understanding mechanical behavior of Mg and solid solution alloys containing Li or Y. Acta Mater. 49, 4277–4289 (2001)CrossRefGoogle Scholar
  6. 6.
    A. Styczynski et al., Cold rolling textures in AZ31 wrought magnesium alloy. Scr. Mater. 50, 943–947 (2004)CrossRefGoogle Scholar
  7. 7.
    T. Mukai et al., Effect of grain refinement on tensile ductility in ZK60 magnesium alloy under dynamic loading. Mater. Trans. 42(7), 1177–1181 (2001)CrossRefGoogle Scholar
  8. 8.
    D.L. Atwell, M.R. Barnett, W.B. Hutchinson, The effect of initial grain size and temperature on the tensile properties of magnesium alloy AZ31 sheet. Mater. Sci. Eng. A 549, 1–6 (2012)CrossRefGoogle Scholar
  9. 9.
    I. Basu, T. Al-Samman, Triggering rare earth texture modification in magnesium alloys by addition of zinc and zirconium. Acta Mater. 67, 116–133 (2014)CrossRefGoogle Scholar
  10. 10.
    T. Mukai et al., Ductility enhancement in AZ31 magnesium alloy by controlling its grain structure. Scr. Mater. 45, 89–94 (2001)CrossRefGoogle Scholar
  11. 11.
    H. Wang, P.D. Wu, M.A. Gharghouri, Effects of basal texture on mechanical behaviour of magnesium alloy AZ31B sheet. Mater. Sci. Eng. A 527, 3588–3594 (2010)CrossRefGoogle Scholar
  12. 12.
    N. Stanford, D. Atwell, M.R. Barnett, The effect of Gd on the recrystallisation, texture and deformation behaviour of magnesium-based alloys. Acta Mater. 58, 6773–6783 (2010)CrossRefGoogle Scholar
  13. 13.
    N. Stanford, M. Barnett, Effect of composition on the texture and deformation behaviour of wrought Mg alloys. Scr. Mater. 58, 179–182 (2008)CrossRefGoogle Scholar
  14. 14.
    Y. Chinoa, M. Mabuchi, Enhanced stretch formability of Mg–Al–Zn alloy sheets rolled at high temperature (723 K). Scripta Mater. 60, 447–450 (2009)CrossRefGoogle Scholar
  15. 15.
    G. Manna, J.R. Griffiths, C.H. Cáceres, Hall-Petch parameters in tension and compression in cast Mg–2Zn alloys. J. Alloy. Compd. 378, 188–191 (2004)CrossRefGoogle Scholar
  16. 16.
    J. Bohlen et al., The texture and anisotropy of magnesium–zinc–rare earth alloy sheets. Acta Mater. 55, 2101–2112 (2007)Google Scholar
  17. 17.
    R. Li et al., Effect of Li addition on the mechanical behavior and texture of the as-extruded AZ31 magnesium alloy. Mater. Sci. Eng. A 562, 33–38 (2013)CrossRefGoogle Scholar
  18. 18.
    Muraoka A. et al., Improvement in rolling workability of Fe3Al by high-speed rolling, in Journal of Physics: Conference Series (IOP Publishing Ltd. 2012)Google Scholar
  19. 19.
    H. Koh et al., Deformation and texture evolution during high-speed rolling of AZ31 magnesium sheets. Mater. Trans. 48(8), 2023–2027 (2007)CrossRefGoogle Scholar
  20. 20.
    M. Sanjari et al., Promotion of texture weakening in magnesium by alloying and thermomechanical processing-II high speed rolling. J. Mater. Sci. 49, 1426–1436 (2014)CrossRefGoogle Scholar
  21. 21.
    H. Li et al., Deformation mechanism and texture and microstructure evolution during high-speed rolling of AZ31B Mg sheets. J. Mater. Sci. 43, 7148–7156 (2008)CrossRefGoogle Scholar
  22. 22.
    S.Q. Zhu et al., Effect of twinning and dynamic recrystallization on the high strain rate rolling process. Scr. Mater. 63, 985–988 (2010)CrossRefGoogle Scholar
  23. 23.
    T. Sakai, Y. Watanabe, H. Utsunomiya, Microstructure and texture of AZ31 magnesium alloy sheet rolled by high speed warm rolling. Mater. Sci. Forum 618–619, 483–486 (2009)Google Scholar
  24. 24.
    J. Su et al., Characteristics of magnesium AZ31 alloys subjected to high speed rolling. Mater. Sci. Eng. A 636, 582–592 (2015)CrossRefGoogle Scholar
  25. 25.
    B. Beausir et al., Analysis of texture evolution in magnesium during equal channel angular extrusion. Acta Mater. 56, 200–214 (2008)CrossRefGoogle Scholar
  26. 26.
    M. Kohzu et al., Texture randomization of AZ31 magnesium alloy sheets for improving the cold formability by a combination of rolling and high-temperature annealing. Mater. Trans. 51(4), 749–755 (2010)Google Scholar
  27. 27.
    A. Levinson et al., Influence of deformation twinning on static annealing of AZ31 Mg alloy. Acta Mater. 61, 5966–5978 (2013)CrossRefGoogle Scholar
  28. 28.
    X. Li et al., Orientational analysis of static recrystallization at compression twins in a magnesium alloy AZ31. Mater. Sci. Eng. A 517, 160–169 (2009)CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2017

Authors and Affiliations

  1. 1.Department of Mining and Materials EngineeringMcGill UniversityMontrealCanada

Personalised recommendations