Influence of surface oxides on the flammability of Mg-Al and Mg-Y alloys

Prasad A., Shi Z. and Atrens A. (2011). Influence of surface oxides on the flammability of Mg-Al and Mg-Y alloys. In: Materials innovation in surface engineering. Materials Innovations in Surface Engineering Conference, Melbourne, VIC, (63-70). 18-20 October 2011.

Author Prasad A.
Shi Z.
Atrens A.
Title of paper Influence of surface oxides on the flammability of Mg-Al and Mg-Y alloys
Conference name Materials Innovations in Surface Engineering Conference
Conference location Melbourne, VIC
Conference dates 18-20 October 2011
Proceedings title Materials innovation in surface engineering
Journal name Materials Forum
Series Materials Forum
Place of Publication North Melbourne, VIC Australia
Publisher Institute of Materials Engineering Australasia Pty. Ltd.
Publication Year 2011
Year available 2011
Sub-type Fully published paper
ISBN 9781876855369
ISSN 0883-2900
Volume 35
Start page 63
End page 70
Total pages 8
Collection year 2012
Abstract/Summary This work studied the flammability of pure Mg, and Mg-Al and Mg-Y alloys. A free diffusion flame was applied to one end of a cylindrical specimen. Ignition required at least partial melting, and burning extinguished once the flame was withdrawn for pure Mg and Mg-Al alloys. Specimen tips of pure Mg, AZ61, and AZ91 ignited upon prolonged flame exposure, there was smouldering and delayed ignition for Mg-1Y and no ignition for Mg-5Y specimen tips, attributed to a protective surface oxide containing Y on the molten Mg-5Y alloy. The results indicate that (i) vigorous burning requires a continued supply of Mg vapour, and (ii) a critical alloy concentration is required to change ignition behaviour, which was associated with a more protective surface oxide of the molten metal for Mg-5Y. This research is an example of surface engineering of the metal once the metal has melted. The surface engineering is produced by adjusting the bulk composition of the Mg alloy. This work points to the possibility of novel surface engineering opportunities now that the critical requirements have been identified. This research is of significant interest for the auto and aerospace sectors where there is concern about the flammability in fires in crash situations.
Subjects 2500 Materials Science
3104 Condensed Matter Physics
2210 Mechanical Engineering
2211 Mechanics of Materials
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Conference Paper
Collection: School of Mechanical & Mining Engineering Publications
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