The effect of grain refinement and silicon content on grain formation in hypoeutectic Al-Si alloys

Lee, Y. C., Dahle, A. K., St John, D. H. and Hutt, J. E. C. (1999) The effect of grain refinement and silicon content on grain formation in hypoeutectic Al-Si alloys. Materials Science And Engineering A - Structural Materials Properties Microstructure and Processing, 259 1: 43-52. doi:10.1016/S0921-5093(98)00884-3


Author Lee, Y. C.
Dahle, A. K.
St John, D. H.
Hutt, J. E. C.
Title The effect of grain refinement and silicon content on grain formation in hypoeutectic Al-Si alloys
Journal name Materials Science And Engineering A - Structural Materials Properties Microstructure and Processing   Check publisher's open access policy
ISSN 0921-5093
Publication date 1999-01-15
Sub-type Article (original research)
DOI 10.1016/S0921-5093(98)00884-3
Open Access Status Not Open Access
Volume 259
Issue 1
Start page 43
End page 52
Total pages 10
Place of publication Switzerland
Publisher Elsevier
Language eng
Subject C1
291403 Alloy Materials
671004 Castings
Abstract The effect of increasing the amount of added grain refiner on grain size and morphology has been investigated for a range of hypoeutectic Al-Si alloys. The results show a transition in grain size at a silicon concentration of about 3 wt% in unrefined alloys; the grain size decreasing with silicon content before the transition, and increasing beyond the transition point. A change in morphology also occurs with increased silicon content. The addition of grain refiner leads to greater refinement for silicon contents below the transition point than for those contents above the transition point, while the transition point seems to remain unchanged. The slope of the grain size versus silicon content curve after the transition seems to be unaffected by the degree of grain refinement. The results are related to the competitive processes of nucleation and constitutional effects during growth and their impact on nucleation kinetics. (C) 1999 Elsevier Science S.A. All rights reserved.
Keyword Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Mon, 13 Aug 2007, 20:51:46 EST