Journal
ACTA MATERIALIA
Volume 58, Issue 9, Pages 3198-3211Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2010.01.038
Keywords
Equal channel angular pressing (ECAP); Ultrafine grained (UFG); Aluminium alloy 6016; Tensile test; Strain hardening
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The microstructure evolution of aluminium alloy 6016 processed by equal channel angular pressing (ECAP) was investigated for different processing parameters. A number of heat treatments, including F, W. O, T4, T6 and T7, were evaluated for workability required to withstand the severe plastic deformation. It was found that this aluminium alloy had limited workability at room temperature in the F, W and T4 tempers, especially at low levels of applied back pressure, while both the O and T7 tempers can be pressed to a very high strain (similar to 1800%) without failure. Considering that the O temper has better utility for industry because of decreased preparation time, a complete study of microstructure after ECAP processing with and without back pressure was carried out for the O temper. The thermal stability of microstructure after 16 ECAP passes with 200 MPa of back pressure was also studied. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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