Journal
MICRON
Volume 32, Issue 8, Pages 851-856Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0968-4328(00)00093-7
Keywords
Al-Cu-Mg alloys; Cd addition; Ag addition; theta ' phase; Omega phase; sigma phased; Cu-Mg co-cluster; Mg-Ag co-cluster
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The present work investigates the effects of individual and combined additions of Cd and Ag on precipitation processes in an Al-4Cu0.3Mg (wt%) alloy. Analytical scanning transmission electron microscopy revealed that microalloying with Cd stimulates nucleation of theta' phase on {001}(alpha). planes and that Cd-rich particles form on the rim and broad facets of the theta' platelets. We interpret these observations to suggest that Cd nucleates heterogeneously at the theta'-alpha interface and that theta' can also nucleate heterogeneously at the Cd-alpha interface. In the quinary alloy, it was observed that Ag and Cd additions seem to work independently resulting in a fine and uniform dispersion of both fl and theta'. Furthermore, the hardening effect of the {111}(alpha) Ohm phase appears to be more potent than other precipitates formed in this system since the hardness of the quinary alloy was intermediate between the Al-Cu-Mg-Ag and the Al-Cu-Cd alloys. (C) 2001 Elsevier Science Ltd. All rights reserved.
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