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Characterization of nanostructured aluminum sheets processed by accumulative roll bonding

Pirgazi, H ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1142/s0217979208047663
  3. Publisher: World Scientific Publishing Co. Pte Ltd , 2008
  4. Abstract:
  5. An ultrafine grained (UFG) aluminum sheet was produced using severe plastic deformation (SPD) by a process known as accumulative roll bonding (ARB). Electron Back Scattered Diffraction (EBSD) method and Transmission Electron Microscopy (TEM) were utilized for characterization of the subgrain and grain structures of the processed sheets. The results indicate that different mechanisms at different levels of strain lead to the gradual evolution of ultrafine or nanocrystalline grains. Grain fragmentation as well as the development of subgrains are the major mechanisms at the early stages of ARB. Strain induced transformation of low angle to high angle grain boundaries and formation of a thin lamellar structure occur at the medium level of strain. Finally, the progressive fragmentation of these thin lamellar structures into more equi-axed grains is the dominant mechanism at relatively high strains which results in grain size reduction to submicron scale. © 2008 World Scientific Publishing Company
  6. Keywords:
  7. Severe plastic deformation ; Accumulative roll bonding ; Ultrafine grained aluminum sheets ; Electron back scattering diffraction
  8. Source: International Journal of Modern Physics B ; Volume 22, Issue 18-19 , 2008 , Pages 2840-2847 ; 02179792 (ISSN)
  9. URL: https://www.worldscientific.com/doi/abs/10.1142/S0217979208047663