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

Wenlong Xiao, Mark Alan Easton, Matthew Simon Dargusch, Su-Ming Zhu, Mark A Gibson

Research output: Contribution to journalArticleResearchpeer-review

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.
Original languageEnglish
Pages (from-to)177 - 184
Number of pages8
JournalMaterials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume539
DOIs
Publication statusPublished - 2012

Cite this

@article{3c2dc982c9364810a15829c8d091a3d9,
title = "The influence of Zn additions on the microstructure and creep resistance of high pressure die cast magnesium alloy AE44",
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.",
author = "Wenlong Xiao and Easton, {Mark Alan} and Dargusch, {Matthew Simon} and Su-Ming Zhu and Gibson, {Mark A}",
year = "2012",
doi = "10.1016/j.msea.2012.01.077",
language = "English",
volume = "539",
pages = "177 -- 184",
journal = "Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier",

}

The influence of Zn additions on the microstructure and creep resistance of high pressure die cast magnesium alloy AE44. / Xiao, Wenlong; Easton, Mark Alan; Dargusch, Matthew Simon; Zhu, Su-Ming; Gibson, Mark A.

In: Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, Vol. 539, 2012, p. 177 - 184.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - The influence of Zn additions on the microstructure and creep resistance of high pressure die cast magnesium alloy AE44

AU - Xiao, Wenlong

AU - Easton, Mark Alan

AU - Dargusch, Matthew Simon

AU - Zhu, Su-Ming

AU - Gibson, Mark A

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

UR - http://dx.doi.org/10.1016/j.msea.2012.01.077

U2 - 10.1016/j.msea.2012.01.077

DO - 10.1016/j.msea.2012.01.077

M3 - Article

VL - 539

SP - 177

EP - 184

JO - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

ER -