Modelling of grain size transition with alloy concentration in solidified Al-Si alloys

Yao, Xiangdong, Dahle, Arne K., Davidson, Cameron J., and St John, David H. (2007) Modelling of grain size transition with alloy concentration in solidified Al-Si alloys. Journal of Materials Science, 42 (23). pp. 9756-9764.

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Abstract

The transition in grain size with Si content in Al–Si alloys has been systematically investigated by the Cellular Automaton-Finite control Volume Method (CAFVM) to understand the operating mechanisms for this behavior. Three aspects: growth restriction factor (GRF), the chemical driving force (CDF) and the constitutional undercooling (ΔT c) have been demonstrated to affect the microstructure formation, and among them the ΔT c plays the most important role. Furthermore, it is also shown that the surface modification of the nucleant particles by silicon significantly influences the grain formation. However, the combined effects of the investigated factors on the grain size were not sufficiently strong to cause a grain size change similar to that observed experimentally. This implies that there could be other mechanisms that control the transition.

Item ID: 2649
Item Type: Article (Refereed Research - C1)
Keywords: grain size; seolidification; microstructure; Al-Si alloys
ISSN: 1573-4803
Date Deposited: 25 Sep 2009 01:23
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091202 Composite and Hybrid Materials @ 50%
10 TECHNOLOGY > 1007 Nanotechnology > 100799 Nanotechnology not elsewhere classified @ 30%
09 ENGINEERING > 0904 Chemical Engineering > 090407 Process Control and Simulation @ 20%
SEO Codes: 85 ENERGY > 8598 Environmentally Sustainable Energy Activities > 859899 Environmentally Sustainable Energy Activities not elsewhere classified @ 50%
85 ENERGY > 8506 Energy Storage, Distribution and Supply > 850699 Energy Storage, Distribution and Supply not elsewhere classified @ 40%
85 ENERGY > 8507 Energy Conservation and Efficiency > 850702 Energy Conservation and Efficiency in Transport @ 10%
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