The influence of Zn additions on the microstructure and creep resistance of high pressure die cast magnesium alloy AE44

Xiao, Wenlong, Easton, Mark A., Dargusch, Matthew S., Zhu, Matthew S. and Gibson, Mark A. (2012) The influence of Zn additions on the microstructure and creep resistance of high pressure die cast magnesium alloy AE44. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 539 177-184. doi:10.1016/j.msea.2012.01.077


Author Xiao, Wenlong
Easton, Mark A.
Dargusch, Matthew S.
Zhu, Matthew S.
Gibson, Mark A.
Title The influence of Zn additions on the microstructure and creep resistance of high pressure die cast magnesium alloy AE44
Journal name Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing   Check publisher's open access policy
ISSN 0921-5093
1873-4936
Publication date 2012-03
Sub-type Article (original research)
DOI 10.1016/j.msea.2012.01.077
Volume 539
Start page 177
End page 184
Total pages 8
Place of publication Lausanne, Switzerland
Publisher Elsevier
Collection year 2013
Language eng
Formatted abstract
Mg–4Al–4RE (AE44) alloys with 1 wt.%, 2 wt.% and 4 wt.% Zn additions were produced by high pressure die casting and their mechanical properties, especially creep properties at elevated temperatures, were evaluated. Although the tensile properties appear not be affected by the additions of Zn, there is a significant decrease in creep resistance with increasing Zn addition. To understand the influence of Zn additions on creep resistance, microstructures of the alloys before and after creep testing or long-term annealing at high temperatures were examined. It is revealed that, as a result of Zn additions, there is a transition in the predominant intermetallic phase form Al–RE to Al2REZn2. The Zn additions also lead to an increased level of Zn solute supersaturated in the α-Mg matrix and, as a result, dynamic precipitation occurred during creep. Based on the microstructural observations, the adverse effect of Zn additions on creep resistance of AE44 is discussed.
Keyword Magnesium alloys
Ae44
Zn addition
Microstructure
Creep properties
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2013 Collection
 
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Created: Mon, 23 Apr 2012, 21:58:35 EST by System User on behalf of School of Mechanical and Mining Engineering