Abstract
The present work reports on foaming of magnesium alloys and composites using MgCO3 as the blowing agent. Foaming was done via the molten metal route by direct addition of MgCO3 in molten Mg. The alloys and composites required for foaming were prepared by varying the concentration of aluminum (10 to 30 wt pct) and calcium (0 and 2 wt pct) in Mg. SiC of 10-µm size and about 10 to 20 vol pct was added as reinforcement particles in the composite. The liquidus temperature of the alloys and composites, the decomposition behavior of MgCO3, and the intrinsic oxides that formed in the melt have a significant effect on the structure of the foams. Mg alloys and composites with 30 wt pct Al showed better foaming behavior with higher expansion, lower density, good cell structure, and uniform cell size distribution due to the smaller difference between their liquidus temperature and the decomposition temperature of MgCO3. The addition of 2 wt pct Ca showed a significant effect on foaming, and the MgO and MgAl2O4 (spinel) particles formed in situ in the molten Mg during foaming acted as the stabilizing agents.
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Notes
ALPORAS is the trademark of Aluminium foams manufactured by Shinko Wire Company Ltd, Japan.
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The authors are thankful to the Science and Engineering Research Board, Department of Science and Technology (DST-SERB), India, for partially supporting this work through Grant No. EMR/2016/006207.
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Manuscript submitted July 2, 2020, accepted December 21, 2020.
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Bhosale, D., Devikar, A., Sasikumar, S. et al. Foaming Mg Alloy and Composite Using MgCO3 Blowing Agent. Metall Mater Trans B 52, 931–943 (2021). https://doi.org/10.1007/s11663-021-02066-0
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DOI: https://doi.org/10.1007/s11663-021-02066-0