MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Hardening Behavior in Aged Al-4%Cu-0.3%Mg Alloys with 0.5 and 2%Ag Additions
Joel Moreno PalmerinHéctor J. Dorantes RosalesVictor M. López HirataNicolás Cayetano CastroJorge L. González VelázquezAngel de J. Morales Ramirez
Author information
JOURNALS FREE ACCESS

2009 Volume 50 Issue 12 Pages 2785-2789

Details
Abstract

The precipitation characterization of Al-4 mass% Cu-0.3 mass% Mg alloy with additions of 0.5 and 2 mass% Ag during aging treatments was carried out by transmission electron microscopy (TEM) and microhardness measurements. TEM observation of aged samples showed that the Ω phase is the dominant phase and it is in coexistence with the θ′ phase. Additionally, the Ω phase has the morphology of polygonal prism (almost hexagonal) with flat interfaces and a thin thickness. The variation of the cube of mean radius of precipitates, r3, followed a linear relationship, as predicted by the Lifshitz, Slyosov and Wagner (LSW) theory for diffusion-controlled coarsening in both alloys. The coarsening process of the Ω phase was slower in the aged Al-4 mass% Cu-0.3 mass% Mg-2 mass% Ag alloy. The decrease in hardness seems to be related to the coarsening of the Ω phase and the loss of coherency.

Information related to the author
© 2009 The Japan Institute of Metals and Materials
Previous article Next article
feedback
Top