Uptake of iron and its effect on grain refinement of pure magnesium by zirconium

Cao, P., Qian, M., StJohn, D. H. and Frost, M. T. (2004) Uptake of iron and its effect on grain refinement of pure magnesium by zirconium. Materials Science And Technology, 20 5: 585-592. doi:10.1179/026708304225012314


Author Cao, P.
Qian, M.
StJohn, D. H.
Frost, M. T.
Title Uptake of iron and its effect on grain refinement of pure magnesium by zirconium
Journal name Materials Science And Technology
ISSN 0267-0836
1743-2847
Publication date 2004-05
Sub-type Article (original research)
DOI 10.1179/026708304225012314
Volume 20
Issue 5
Start page 585
End page 592
Total pages 8
Editor J. F. Knott
Place of publication England
Publisher Maney Publishing
Collection year 2004
Language eng
Subject C1
291403 Alloy Materials
670899 Other non-ferrous metals (e.g. copper, zinc)
Formatted abstract
The uptake of iron by molten magnesium from uncoated new mild steel crucibles at temperatures 680°C, 730°C, and 780°C has been investigated. It was shown that the uptake of iron was sluggish at 680°C and the use of 0.05% zirconium addition could effectively suppress the increase in iron content within the first 2 h of holding at temperature. Rapid and severe uptake of iron was observed at 780°C. As a consequence, it was found that the grain refinement of pure magnesium achieved by 1% zirconium addition nearly vanished after 60 min hold at 780°C due to the depletion of soluble zirconium. The uptake of iron at 730°C was conspicuous but it was still controllable by use of 0.05% zirconium addition within the first 60 min of holding at temperature. The work conducted using an aluminium titanite crucible and a boron nitride coated mild steel crucible at 730°C further confirmed the highly detrimental influence of the uptake of iron on the grain refinement of pure magnesium by zirconium. The characteristic zirconium rich coring structures developed from circular to rosette like when the melt was held at 730°C in an uncoated mild steel crucible, while no such evolution was observed when held in an aluminium titanite crucible at the same temperature. Recommendations to minimise the consumption of zirconium by the uptake of iron were made based on the results obtained from this investigation. The mechanism of grain refinement of magnesium by a low concentration of zirconium is discussed.
© 2004 IoM Communications Ltd. Published by Maney for the Institute of Materials, Minerals and Mining.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Magnesium
Zirconium
Grain refinement
Iron
Zr
Alloys
Q-Index Code C1
Additional Notes Prepress title: "Uptake of iron and its effect on grain refinement of magnesium alloys by zirconium".

 
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Created: Wed, 15 Aug 2007, 04:01:06 EST