Mechanisms of grain refinement of magnesium alloys

StJohn, David H., Qian, Ma, Easton, Mark A., Cao, Peng and Hildebrand, Zoë (2005). Mechanisms of grain refinement of magnesium alloys. In: Magnesium Technology 2004: Proceedings of the Symposium on Magnesium Technology 2004 held at the TMS Annual Meeting. TMS 2004: 133rd Annual Meeting & Exhibition, Charlotte, North Carolina, U.S.A., (). 14-17 March, 2004.


Author StJohn, David H.
Qian, Ma
Easton, Mark A.
Cao, Peng
Hildebrand, Zoë
Title of paper Mechanisms of grain refinement of magnesium alloys
Conference name TMS 2004: 133rd Annual Meeting & Exhibition
Conference location Charlotte, North Carolina, U.S.A.
Conference dates 14-17 March, 2004
Proceedings title Magnesium Technology 2004: Proceedings of the Symposium on Magnesium Technology 2004 held at the TMS Annual Meeting   Check publisher's open access policy
Place of Publication New York, NY, U.S.A.
Publisher Minerals, Metals & Materials Society (TMS)
Publication Year 2005
Sub-type Oral presentation
ISBN 9780873395687
0-87339-568-9
ISSN 1545-4150
1545-4169
Language eng
Formatted Abstract/Summary
Unlike most other alloy systems a fine grain size is required for good creep resistance for most magnesium alloys so that a thin intermetallic phase forms along the boundaries preventing grain boundary sliding. For magnesium alloys that do not contain aluminium, zirconium is the best grain refiner. To minimise cost and thus the amount of zirconium added it is important to understand the mechanism by which zirconium refines these alloys. The mechanism revealed by recent work and the resultant improved refiner addition that was developed is described. In contrast, magnesium alloys that contain aluminium do not have a reliable and easy to use grain refiner addition. This paper describes the range of grain refining technologies that have been developed. These are considered in the light of the current theory of grain refinement. Directions for research are suggested that could lead to a commercially viable refiner for magnesium-aluminium based alloys.
Subjects C1
291499 Materials Engineering not elsewhere classified
680305 Metals (composites, coatings, bonding, etc.)
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Mg-Al Alloys
Aluminum-alloys
Pure Magnesium
Master Alloy
Zirconium
Inoculation
Nucleant
Solute
Model
Iron
Q-Index Code EX
Q-Index Status Provisional Code
Additional Notes This was an Invited Paper presented during the session "Phase Transformations and Deformation in Magnesium Alloys: Solidification and Precipitation". Easton, Mark A.; Cao, Peng; and Hildebrand, Zoë; are not credited on this paper. This paper not reproduced in the Proceedings.

 
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Created: Wed, 15 Aug 2007, 05:42:22 EST