Journal
SCRIPTA MATERIALIA
Volume 58, Issue 9, Pages 719-722Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2007.11.039
Keywords
positron annihilation; self-healing; aluminium alloys; precipitation
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The generation and evolution of open volume defects in underaged and T3 Al-Cu-Mg alloy is studied with positron annihilation spectroscopy. During room temperature ageing the positron lifetime in plastically deformed, underaged material approaches the saturation lifetime of the undeformed material. Doppler-broadening results indicate that this behaviour can be attributed to diffusion and clustering of retained solute Cu atoms at the deformation defects, a process of relevance for the introduction of a self-healing mechanism in age-hardenable aluminium alloys. (C) 2007 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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