Compositional characterization of Cu-rich phase particles present in As-Cast Al-Cu-Mg(-Li) alloys containing Ag

From: Metallurgical and Materials Transactions | Date: July 1, 1999| Author: | Copyright information

The effects of small additions of Ag on the aging of wrought Al-Cu-Mg(-Li) alloys, involving widespread nucleation of Cu-rich Omega (and T^supb1^) phase precipitates, are known. This article examines the influence of small additions of Ag on the nature of Cu-rich(theta) S-Al^sub 2^Cu, S-Al2CuMg, and T^sub 1^-Al^sub 2^CuLi phases present in appropriate as-cast Al-Cu, Al-Cu-Mg, and Al-Cu-Li-Mg alloys. Using a combination of light microscopy, scanning electron microscopy (SEM), and electron probe microanalysis (EPMA), it is shown that neither independent nor combined additions of Ag and Mg to ...

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