Journal article
A diffusion boundary layer model of microsegregation
Journal of crystal growth, Vol.187(2), pp.289-302
1998
DOI: 10.1016/S0022-0248(97)00878-6
Abstract
A microsegregation model, based on a boundary layer concept, is proposed for solidification of alloys. The model is derived by considering finite-rate solute diffusion both in the liquid and in the solid. A solutal Fourier number is used to characterize the extent of finite-rate solute diffusion in the liquid phase ahead of the moving solid/liquid interface. This new parameter is the liquid counterpart of the solutal Fourier number in the solid phase used before to characterize finite-rate back-diffusion in the solid. It can be obtained through the knowledge of either the local solidification time or the operating point of the cell/dendrite tip (among other parameters). The present microsegregation model covers the entire spectrum of solidification rates, up to the limit of a microsegregation free solid. The model predictions show good agreement with a previous rapid solidification experiment involving an Ag–Cu alloy. Also, a new relation is derived for the primary dendrite arm spacing.
Details
- Title: Subtitle
- A diffusion boundary layer model of microsegregation
- Creators
- X TONG - Department of Mechanical Engineering, The University of Iowa, Iowa City, IA 52242, United StatesC BECKERMANN - Department of Mechanical Engineering, The University of Iowa, Iowa City, IA 52242, United States
- Resource Type
- Journal article
- Publication Details
- Journal of crystal growth, Vol.187(2), pp.289-302
- DOI
- 10.1016/S0022-0248(97)00878-6
- ISSN
- 0022-0248
- eISSN
- 1873-5002
- Publisher
- Elsevier; Amsterdam
- Language
- English
- Date published
- 1998
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984064228102771
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