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Easton M.,RMIT University | Gibson M.,CSIRO | Zhu S.M.,RMIT University | Yang K.,Monash University | Abbott T.,Magontec Ltd
Materials Science Forum | Year: 2015

esearch into magnesium die-cast alloys from the Mg-Al-(Zn), Mg-Zn-(Al), Mg-rare earth (RE) and Mg-Al-RE systems is discussed. Particular attention is paid to factors influencing mechanical properties and castability. The nature and level of alloy addition is in all cases an important determinant of castability (cracking and fluidity) and mechanical properties (strength, ductility and creep resistance). The interplay of these factors shows considerable variation between different alloy systems. © (2015) Trans Tech Publications, Switzerland.

Gandel D.S.,Monash University | Easton M.A.,Monash University | Gibson M.A.,Monash University | Gibson M.A.,CSIRO | And 3 more authors.
Magnesium Technology | Year: 2013

In this study, sixteen Mg-Zr alloys were produced to investigate the role of Zr on corrosion of Mg. Alloys were produced using two different commercial Mg-Zr master alloys commonly used for grain refining Mg, but which contain different Zr particle size distributions. It is seen that the master alloy with a smaller Zr particle size leads to an alloy containing more Zr in solid solution. The ratio of Zr in solid solution and in particle form was observed to have a marked effect on the corrosion of Mg.

Gandel D.S.,Cooperative Research Center | Gandel D.S.,Monash University | Easton M.A.,Cooperative Research Center | Easton M.A.,Monash University | And 6 more authors.
Corrosion Science | Year: 2014

Sixteen custom binary Mg-Zr alloys and four commercial Zr-containing Mg-alloys were used to investigate the role of Zr on the corrosion of Mg. Mg-Zr alloys were manufactured with a range of different Zr concentrations. It was observed that the Mg-Zr alloys with a smaller mean Zr particle size had more Zr dissolved in solid solution. Both the Zr in solid solution and in metallic particle form were observed to have a deleterious effect on the corrosion rate of Mg. However, this deleterious effect is less pronounced to effect in alloys with multiple alloying additions. © 2013.

Zhu S.M.,RMIT University | Zhu S.M.,Monash University | Abbott T.B.,RMIT University | Abbott T.B.,Monash University | And 6 more authors.
Materials Science and Engineering A | Year: 2016

Die-cast Mg-Al-rare earth (RE) alloys are normally used in the as-cast condition without the application of heat treatment because it is a common perception that heat treatment will not provide benefit to these alloys. This paper reports, for the first time, that enhanced age hardenability can be achieved in die-cast Mg-Al-RE alloys with minor Mn additions. For example, the yield strength of Mg-4. wt%Al-3. wt%La alloy with 0.32. wt% Mn is increased by ~34. MPa (~26%) after ageing at 200. °C for 32. h (T5). The enhanced age hardenability is associated with the precipitation of nanoscale Al-Mn particles during ageing. © 2016 Elsevier B.V.

Easton M.,RMIT University | Gavras S.,Monash University | Gibson M.,RMIT University | Gibson M.,Monash University | And 5 more authors.
Magnesium Technology | Year: 2016

Magnesium-rare earth based alloys generally show good creep resistance at elevated temperatures and are consequently very promising candidates for powertrain applications. However, for magnesium-rare earth alloys to be used in high pressure die-cast components, they also need to have sufficient die-castability. This paper analyses the data from a series of investigations into binary and ternary magnesium-rare earth (RE) based alloys with the REs including La, Ce, Nd, Y and Gd, with an aim to identify alloy compositions that are castable. It is found that Mg-La based alloys are least susceptible to hot tearing whilst alloys containing Nd, Y or Gd tend to have very high hot tearing susceptibility. The hot tearing susceptibility of Mg-RE-Zn and Mg-Al-RE alloys is also addressed. Copyright © 2016 by The Minerals, Metals & Materials Society. All rights reserved.

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