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Precipitation processes in Al-Cu-Mg-Sn and Al-Cu-Mg-Sn-Ag

Version 2 2024-06-06, 07:15
Version 1 2016-03-18, 10:41
journal contribution
posted on 2024-06-06, 07:15 authored by I Poon, Ross MarceauRoss Marceau, J Xia, XZ Liao, SP Ringer
Microalloying trace elements into aluminum alloys have been shown to improve mechanical properties by altering the precipitation process. Here, trace amounts of Sn and (Sn + Ag) have been added to Al-1.1Cu-1.7Mg (at.%) and the effects have been investigated by a combination of hardness testing and transmission electron microscopy (TEM). Hardness testing shows that the addition of Sn increases the hardness throughout the ageing process, and in combination with Ag, further increases the hardness and shortens the time to reach the peak hardness. The increase in hardness via Sn microalloying is attributed to the homogeneous distribution of S phase (Al2CuMg) precipitates. In the alloy microalloyed with both Sn and Ag, the microstructure is dominated by homogeneously distributed Ω phase (Al2Cu) precipitates in the peak strengthened condition. Given that neither spherical β-Sn precipitates, nor any other obvious nucleation sites for the Ω phase precipitates were observed using TEM, the mechanism for development of such homogeneous precipitation remains to be determined.

History

Journal

Materials and design

Volume

96

Pagination

385-391

Location

Amsterdam, The Netherlands

ISSN

0264-1275

eISSN

1873-4197

Language

eng

Publication classification

C Journal article, C1 Refereed article in a scholarly journal

Copyright notice

2016, Elsevier

Publisher

Elsevier