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The formation of Cu-Mg clusters in an Al-Cu-Mg aluminum alloy is observed by small-angle X-ray scattering during cooling. Cooling rates are choosen to mimic the different conditions obtained at the surface and in the center of large forgings. Clusters of 0.45 nm start to form at 250 degrees C. Their volume fraction depends strongly on the cooling rate and the amount of excess vacancies. The difference in cluster kinetics explains the difference in rapid hardening across large forgings. (C) 2015 Acts Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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Christian Leinenbach, Patrick Schloth, Steven Van Petegem, Helena Van Swygenhoven
Jean-Marie Drezet, Patrick Schloth, Helena Van Swygenhoven