Abstract
Microstructural evolutions of AA1050 aluminium alloy, prepared by accumulative press bonding, have been investigated by means of sophisticated analytical tools, including STEM and EBSD. The results revealed that continuous dynamic recovery was dominant mechanism in grain refinement, and resulted in formation of nano/ultrafine grains with average diameter of 450 nm in pressing direction and 320 nm in transverse direction. By increasing strain during APB process, the mean misorientation angle and the fraction of high angle boundaries increased and reached a saturation value of ~35° and ~78%, respectively.
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