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The effect of initial microstructure and processing temperature on microstructure and texture in multilayered Al/Al(Sc) ARB sheets

  • Md. Zakaria Quadir , Oday Al-Buhamad , Kai D. Lau , Ryan Quarfoth , Lori Bassman , Paul R. Munroe and Michael Ferry
Published/Copyright: June 11, 2013
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Abstract

A commercial purity Al alloy and an Al-0.3Sc (wt.%) alloy, the latter in either the supersaturated or artificially aged condition, were accumulative roll bonded at either 200 or 350°C to high strain to generate sheet materials consisting of 32 or 64 alternating layers of Al and Al(Sc). The microstructure and texture of the processed materials were investigated mainly using electron backscattered diffraction scanning electron microscopy and transmission electron microscopy. The deformation microstructure and texture of these two alloy combinations were strongly influenced by both the initial heat treatment condition of the Al(Sc) alloy whereby large-scale shear bands were generated during rolling when a dispersion of fine Al3Sc particles is present in the Al(Sc) layers. The effect of initial microstructure and processing temperature affected the subsequent recrystallization microstructure and texture of the Al/Al(Sc) composite during annealing at 350°C. Here, the Al(Sc) layers remain unrecrystallized in all materials with the Al layers undergoing continuous and discontinuous recrystallization after low and high temperature ARB, respectively. The lack of recrystallization in the Al(Sc) layers generated an alternating recrystallized/recovered microstructure in all materials.


* Correspondence address, Dr. Md Zakaria Quadir, Electron Microscope Unit, University of New South Wales (UNSW). Tel.: 61 (02) 9385 9752, Fax: 61 (02) 9385 6400, E-mail:

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Received: 2009-3-27
Accepted: 2009-9-7
Published Online: 2013-06-11
Published in Print: 2009-12-01

© 2009, Carl Hanser Verlag, München

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