Modeling of grain refinement: Part III. Al-7Si-0.3Mg aluminum alloy

Yao, X., McDonald, S. D., Dahle, A. K., Davidson, C. J. and St John, D. H. (2008) Modeling of grain refinement: Part III. Al-7Si-0.3Mg aluminum alloy. Journal of Materials Research, 23 5: 1301-1306. doi:10.1557/JMR.2008.0155

Author Yao, X.
McDonald, S. D.
Dahle, A. K.
Davidson, C. J.
St John, D. H.
Title Modeling of grain refinement: Part III. Al-7Si-0.3Mg aluminum alloy
Journal name Journal of Materials Research   Check publisher's open access policy
ISSN 0884-2914
Publication date 2008-05-01
Year available 2008
Sub-type Article (original research)
DOI 10.1557/JMR.2008.0155
Open Access Status Not yet assessed
Volume 23
Issue 5
Start page 1301
End page 1306
Total pages 6
Editor G. E. Pike
Place of publication Warrendale, PA, U.S.
Publisher Materials Research Society
Language eng
Subject C1
8612 Fabricated Metal Products
091207 Metals and Alloy Materials
Abstract Following Part I [X. Yao, et al., J. Mater. Res.23(5), 1282 (2008)] and Part II [X. Yao, et al., J. Mater. Res.23(5), 1292 (2008)] the cellular automation–finite control volume method (CAFVM) model was used to study the grain formation and microstructure morphology resulting from solidification of a commercial Al–Si–Mg alloy with Al–Ti–B grain refiner additions. The model incorporates the effect of the introduced solute Ti and the alloying elements of Si and Mg on the growth restriction factor, constitutional undercooling, and nucleation parameters. With respect to grain refinement, it is found that the alloying elements, Si and Mg, play a role that is similar to Ti qualitatively while different quantitatively. Accordingly, a concept of “equivalent solute” determined by phase diagram parameters such as the solute partitioning coefficient and the liquidus slope is proposed to clarify the effect of each solute in the alloy on grain formation during solidification. Based on the calculations and on comparison to the experimental data, a possible mechanism of grain refinement in this alloy system is proposed.
Keyword Al-si Alloys
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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Created: Thu, 26 Mar 2009, 23:14:03 EST by Sally Beard on behalf of Materials