The role of solute in grain refinement of magnesium |
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Authors: | Y C Lee A K Dahle D H StJohn |
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Affiliation: | (1) the CRC for Cast Metals Manufacturing (CAST), Department of Mining, Minerals and Materials Engineering, The University of Queensland, 4072 Brisbane, Qld, Australia |
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Abstract: | The effect of separate solute additions of Al, Zr, Sr, Si, and Ca on grain size of Mg has been investigated. Increasing the
Al content in hypoeutectic Mg-Al alloys resulted in a continuous reduction in grain size up to 5 wt pct Al, reaching a relatively
constant grain size for higher Al contents (above 5 wt pct). The effect of Sr additions was investigated in both low- and
high-Al content magnesium alloys, and it was found that Sr had a significant grain refining effect in low-Al containing alloys
but a negligible effect on grain size in Mg-9Al. Additions of Zr, Si, and Ca to pure magnesium resulted in efficient grain
refinement. The grain refinement is mainly caused by their growth restriction effects, i.e., constitutional undercooling, during solidification, but the effect of nucleant particles, either introduced with the alloying
additions or as secondary phases formed as a result of these additions, may enhance the grain refinement. A brief review of
grain refinement of magnesium alloys is included in this article to provide an update on research in this field. |
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