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An A Priori Hot-Tearing Indicator Applied to Die-Cast Magnesium-Rare Earth Alloys |
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| Authors: | Mark A Easton Mark A Gibson Suming Zhu Trevor B Abbott |
| Affiliation: | 1. Department of Materials Engineering, CAST Co-Operative Research Centre, Monash University, Building 69, Clayton, VIC, 3800, Australia 2. School of Aerospace, Mechanical and Manufacturing Engineering, PO Box 71, Bundoora, VIC, 3083, Australia 3. CSIRO Process Science and Engineering, Clayton, VIC, Australia 4. Magontec Ltd., Level 8 139 Macquarie Street, Sydney, NSW, 2000, Australia |
| Abstract: | Hot-tearing susceptibility is an important consideration for alloy design. Based on a review of previous research, an a priori indicator for the prediction of an alloy’s hot-tearing susceptibility is proposed in this article and is applied to a range of magnesium-rare earth (RE)-based alloys. The indicator involves taking the integral over the solid fraction/temperature curve between the temperature when feeding becomes restricted (coherency) and that when a three-dimension network of solid is formed (coalescence). The hot-tearing propensity of Mg-RE alloys is found to vary greatly depending on which RE is primarily used, due to the difference in the solidification range. Mg-Nd alloys are the most susceptible to hot tearing, followed by Mg-Ce-based alloys, while Mg-La alloys show almost no hot tearing. The proposed indicator can be well applied to hot-tearing propensity of the Mg-RE alloys. It is expected that the indicator could be used as an estimation of the relative hot-tearing propensity in other alloy systems as well. |
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