Alloying of pure magnesium with Mg-33.3 wt-%Zr master alloy

Qian, M., Graham, D., Zheng, L., St John, D. H. and Frost, M. T. (2003) Alloying of pure magnesium with Mg-33.3 wt-%Zr master alloy. Materials Science And Technology, 19 2: 156-162.


Author Qian, M.
Graham, D.
Zheng, L.
St John, D. H.
Frost, M. T.
Title Alloying of pure magnesium with Mg-33.3 wt-%Zr master alloy
Journal name Materials Science And Technology
ISSN 0267-0836
Publication date 2003-02
Sub-type Article (original research)
DOI 10.1179/026708303225010849
Volume 19
Issue 2
Start page 156
End page 162
Total pages 7
Place of publication Leeds, England
Publisher Maney Publishing
Collection year 2003
Language eng
Subject C1
291302 Physical Metallurgy
671101 Automotive equipment
Abstract To capitalise on the strengthening potential of zirconium as a potent grain refiner for magnesium alloys, the mechanisms of adding zirconium to magnesium and its subsequent grain refining action need to be understood. Using a Mg-33.3Zr master alloy (Zirmax supplied by Magnesium Elektron Ltd) as a zirconium alloying additive, the influence of different alloying conditions on the dissolution of zirconium in magnesium was investigated. It was found that owing to the highly alloyable microstructure of Zirmax, the dissolution of zirconium was generally complete within a few minutes in the temperature range 730 to 780degreesC. Prolonging and/or intensifying stirring were found to have no conspicuous influence on further enhancing the dissolution of zirconium. In all cases studied, the average grain size increased with increasing holding time at temperature while the total zirconium content decreased. The finest grain structure and highest total zirconium content corresponded to sampling immediately after stirring. Pick up of iron by molten magnesium from the mild steel crucibles used for melting and holding, was significantly delayed or avoided in the temperature range 730 to 780degreesC by coating the crucibles with boron nitride. It is therefore feasible to conduct zirconium alloying at 730degreesC without the need of a considerable excess of Zirmax addition using a properly coated or lined steel crucible.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Q-Index Code C1

 
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