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

Poon, I., Marceau, R.K.W., Xia, J., Liao, X.Z. and Ringer, S.P. 2016, Precipitation processes in Al-Cu-Mg-Sn and Al-Cu-Mg-Sn-Ag, Materials and design, vol. 96, pp. 385-391, doi: 10.1016/j.matdes.2016.02.048.

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Title Precipitation processes in Al-Cu-Mg-Sn and Al-Cu-Mg-Sn-Ag
Author(s) Poon, I.
Marceau, R.K.W.ORCID iD for Marceau, R.K.W.
Xia, J.
Liao, X.Z.
Ringer, S.P.
Journal name Materials and design
Volume number 96
Start page 385
End page 391
Total pages 7
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-04-15
ISSN 0264-1275
Keyword(s) Electron microscopy
Aluminium alloys
Age hardening
Summary 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.
Language eng
DOI 10.1016/j.matdes.2016.02.048
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0913 Mechanical Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
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Document type: Journal Article
Collections: Institute for Frontier Materials
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