Effect of beryllium on the stabilization of Mg-3Ca alloy foams

[Display omitted] •Mg-3Ca alloy foams of density as low as 0.25 g/cm3 were successfully produced via liquid metal route in open air atmosphere with trace Be addition.•The stable BeO layer formed at the gas–solid interfaces of pores restricted the Mg + CO2/CO reaction, thereby reducing the gas loss r...

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Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2022-12, Vol.286, p.116007, Article 116007
Main Authors: Devikar, Akshay, Bhosale, Dipak, Georgy, K., Mukherjee, Manas, Vinod Kumar, G.S.
Format: Article
Language:English
Subjects:
Aluminum
Beryllium
Blowing agents
Calcium carbonate
Foam stabilization
Foamed metals
Free surfaces
Magnesium base alloys
Magnesium foams
Metal foams
Metal oxides
Oxidation
Reagents
Stability
X ray photoelectron spectroscopy
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Summary:[Display omitted] •Mg-3Ca alloy foams of density as low as 0.25 g/cm3 were successfully produced via liquid metal route in open air atmosphere with trace Be addition.•The stable BeO layer formed at the gas–solid interfaces of pores restricted the Mg + CO2/CO reaction, thereby reducing the gas loss responsible for foaming.•Be addition (0.13 wt%) resulted in high volume expansion of Mg-3Ca foam (694 %).•Metallic single films also exhibited smooth and crack-free interfaces with Be addition. The present work is the first ever study where the influence of beryllium (Be) addition on the stability of Mg alloy foam was investigated. Mg-3Ca alloy foams were produced by the liquid processing route with and without Be micro-addition. CaCO3 was used as a blowing agent. Mg-3Ca alloy foam without Be resulted in stable foam but exhibited low expansion with poor foam structure. Be addition significantly increased foam expansion and improved their structure. The expansion and the structure of the Mg foams obtained are comparable with that of commercially available aluminum foams. The XPS analysis confirmed the presence of BeO at the gas–solid interface of Mg foam. Be stabilizes the gas–solid interface of the foam by forming a smooth and crack-free surface of BeO layer which prevents the continuous oxidation of liquid foam and also minimizes the loss of blowing gas thereby enhancing the stability of Mg-3Ca alloy foams.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2022.116007