The effect of solute on ultrasonic grain refinement of magnesium alloys

Qian, M., Ramirez, A., Das, A. and St John, D. H. (2010) The effect of solute on ultrasonic grain refinement of magnesium alloys. Journal of Crystal Growth, 312 15: 2267-2272. doi:10.1016/j.jcrysgro.2010.04.035


Author Qian, M.
Ramirez, A.
Das, A.
St John, D. H.
Title The effect of solute on ultrasonic grain refinement of magnesium alloys
Journal name Journal of Crystal Growth   Check publisher's open access policy
ISSN 0022-0248
1873-5002
Publication date 2010-07-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.jcrysgro.2010.04.035
Open Access Status Not yet assessed
Volume 312
Issue 15
Start page 2267
End page 2272
Total pages 6
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Language eng
Subject 3104 Condensed Matter Physics
1604 Inorganic Chemistry
2505 Materials Chemistry
Abstract An experimental study has been conducted to assess the structural refinement of magnesium and its alloys by ultrasonic irradiation during solidification. It is shown that (i) ultrasonic irradiation leads to significant refinement only in the presence of adequate solute, which is alloy dependent; (ii) the attendant grain density increases linearly with increase in solute content at a given irradiation level; (iii) increasing the solute content at a low irradiation level above the cavitation threshold is more effective than substantially increasing the irradiation intensity; and (iv) the difference in the grain size between two ultrasonicated magnesium alloys is mainly determined by the solute content rather than the irradiation intensity. In view of these, the effect of ultrasonic irradiation on solute redistribution in a solidifying magnesium alloy seems rather limited even at a substantial intensity level such as 1700 W cm-2. The implications of these findings are discussed and a mechanism is proposed to account for the experimental observations. © 2010 Elsevier B.V. All rights reserved.
Keyword Ultrasonic treatment
Solidification
Grain refinement
Metals
Aluminum A356 alloy
Mechanical-properties
Solidification
Vibration
Microstructure
Slurries
Phase
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Received 18 December 2009; revised 1 April 2010; accepted 16 April 2010. Communicated by M. Plapp. Available online 22 April 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2011 Collection
 
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Created: Sun, 18 Jul 2010, 10:05:09 EST