The loss of dissolved zirconium in zirconium-refined magnesium alloys after remelting

Qian, M., Hildebrand, Z.C.G. and StJohn, D. H. (2009) The loss of dissolved zirconium in zirconium-refined magnesium alloys after remelting. Metallurgical and materials transactions. A, Physical metallurgy and materials science, 40 10: 2470-2479. doi:10.1007/s11661-009-9928-8


Author Qian, M.
Hildebrand, Z.C.G.
StJohn, D. H.
Title The loss of dissolved zirconium in zirconium-refined magnesium alloys after remelting
Journal name Metallurgical and materials transactions. A, Physical metallurgy and materials science   Check publisher's open access policy
ISSN 1073-5623
1543-1940
Publication date 2009-10-01
Year available 2009
Sub-type Article (original research)
DOI 10.1007/s11661-009-9928-8
Volume 40
Issue 10
Start page 2470
End page 2479
Total pages 10
Editor Laughlin, D.E.
Place of publication New York, U.S.A
Publisher Springer New York LLC
Collection year 2010
Language eng
Subject C1
0912 Materials Engineering
091207 Metals and Alloy Materials
861206 Structural Metal Products
861203 Metal Castings
Abstract Magnesium–rare earth–zirconium (Mg-RE-Zr) materials are a high value-added class of speciality alloys used chiefly for aerospace applications, where the use of zirconium ensures the critically needed structural uniformity and consistency in performance through potent grain refinement. However, the manufacture of these alloy components has proved to be problematic and volatile. A viable approach preferred by manufacturers is to simply remelt fully grain-refined prealloyed ingot materials and cast. Unfortunately, the dissolved Zr content in these alloys decreases appreciably after remelting, leading to significantly increased grain sizes and inhomogeneity. This work investigates the mechanisms responsible for the loss of dissolved Zr in Zr-refined magnesium alloys after remelting. It was revealed that the phenomenon stems from the unique Zr-rich cores existing in these alloys. Precipitation of zirconium from these supersaturated cores during heating reduces the dissolved Zr content in the α-Mg phase. On the other hand, once precipitated out, the zirconium precipitates show very limited dissolution in molten magnesium due to their discontinuous dissolution behavior in the absence of agitation. The loss of dissolved Zr was found to be reversible by agitation when remelted in an iron-free environment while irreversible in steel crucibles due to the interference from iron.
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Mechanical & Mining Engineering Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 16 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Wed, 25 Nov 2009, 20:49:43 EST by Ms Lynette Adams on behalf of School of Mechanical and Mining Engineering