Effects of alternating current imposition and alkaline earth elements on modification of primary Mg 2Si crystals in hypereutectic Mg-Si alloy

The effects of alternating current imposition and/or alkaline earth elements on modification of the primary Mg 2Si crystals in the hypereutectic Mg-Si alloy were investigated. An alternating current of 60 A with frequency of 1 kHz was applied into the hypereutectic Mg-Si melt which was alloyed with...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2009, Vol.19 (5), p.1051-1056
Main Authors: DU, Jun, IWAI, K., LI, Wen-fang, PENG, Ji-hua
Format: Article
Language:English
Subjects:
alkaline earth elements
alternating current imposition
Mg-Si alloys
primary Mg 2Si crystal
refinement
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Summary:The effects of alternating current imposition and/or alkaline earth elements on modification of the primary Mg 2Si crystals in the hypereutectic Mg-Si alloy were investigated. An alternating current of 60 A with frequency of 1 kHz was applied into the hypereutectic Mg-Si melt which was alloyed with alkaline earth elements or not in the fixed temperature range from 700 to 630 °C. The results show that the primary Mg 2Si crystals could be refined by imposing alternating current or adding alkaline elements. Compared with the samples treated by adding 0.4% Ca or 0.4% Sr, higher modification efficiency could be obtained for the samples treated by imposing alternating current. No further modification efficiency could be obtained for the samples treated by imposing alternating current combined with 0.4% Ca or 0.4% Sr addition.
ISSN:1003-6326
DOI:10.1016/S1003-6326(08)60405-7