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The Physics of Metals and Metallography

, Volume 116, Issue 9, pp 908–916 | Cite as

Study of the mechanisms of superplastic deformation in Al–Mg–Mn-based alloys

  • O. A. Yakovtseva
  • A. V. MikhaylovskayaEmail author
  • V. S. Levchenko
  • A. V. Irzhak
  • V. K. Portnoy
Strength and Plasticity

Abstract

The contributions of grain boundary sliding and intragranular dislocation slip in the AMg4 alloy (analog AA5083) during superplastic deformation have been analyzed by analyzing the deformation-induced changes in the sample surface having marker grids patterned by ion beam etching. Optical, electron transmission, and scanning microscopy techniques, and electron backscatter diffraction were used to analyze the changes in dislocation, grain, and subgrain structures during superplastic deformation. It has been shown that dynamic polygonization develops during superplastic deformation. The contribution of diffusion creep is defined from the analysis of precipitation-free zones observed after deformation.

Keywords

aluminum alloys superplasticity mechanisms grain boundary sliding intragranular dislocation slip diffusion creep 

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Copyright information

© Pleiades Publishing, Ltd. 2015

Authors and Affiliations

  • O. A. Yakovtseva
    • 1
  • A. V. Mikhaylovskaya
    • 1
    Email author
  • V. S. Levchenko
    • 1
  • A. V. Irzhak
    • 2
  • V. K. Portnoy
    • 1
  1. 1.National University of Science and Technology MISiSMoscowRussia
  2. 2.Institute of Microelectronics Technology and High-Purity MaterialsRussian Academy of Sciences (IMT RAS)ChernogolovkaRussia

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