Effect of Ca additions on microstructure and microhardness of an as-cast Mg-5.0 wt.% Al alloy |
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Authors: | Lihong Han Henry Hu Derek O Northwood |
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Affiliation: | Department of Mechanical, Automotive and Materials Engineering, University of Windsor, Windsor, Ontario, Canada N9B 3P4 |
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Abstract: | The effects of Ca additions (0.5-2.0 wt.%) on the microstructure and the microhardness of an as-cast Mg-5.0 wt.% Al alloy have been investigated. The coarse microstructure of the base alloy can be refined through adding Ca. DSC and TEM results showed that, as Ca additions increased up to 1.5 wt.% Ca, the β-Mg17Al12 phase was completely replaced by a (Al, Mg)2Ca phase. The Vickers microhardness of the as-cast Mg-Al-Ca alloys increased with increasing Ca content. Tests on the Mg-5.0Al-2.0Ca (wt.%) alloy showed an indentation size effect, which was well described by Meyer's Law. |
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Keywords: | Mg-Al-Ca alloy Hardness Indentation size effect Microstructure |
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