Journal
SCRIPTA MATERIALIA
Volume 54, Issue 1, Pages 99-103Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2005.08.044
Keywords
Al-Si-Mg foundry alloy; Cu; precipitation; Q-phase; artificial aging
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The influence of Cu on the mechanical properties of AlSi7MgO.5 alloy after T6 heat treatment has been studied. The tensile strength and peak age hardness increase while the elongation decreases with increasing Cu content in the alloy. The investigation of the precipitation behavior of dispersoids during aging by transmission electron microscopy (TEM) and high resolution TEM shows that Cu addition increases the density of the beta precipitates and induces the precipitation of precursors of Q phase at the peak aged condition. When the Cu content is high, theta'-Al2Cu phase also precipitates during artificial aging. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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