Finite diffusion microsegregation model applied to multicomponent alloys

During casting, diffusion phenomena are often simplified by Lever-Rule or GulliverScheil hypotheses, thus simplifying chemical diffusion to extreme configurations. The present work proposes an extension of the Tong-Beckermann microsegregation model to multi-component alloys while considering finite...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-05, Vol.529 (1), p.12029
Main Authors: Maguin, V., Guillemot, G., Jaquet, V., Niane, N. T., Rougier, L., Daloz, D., Zollinger, J., Gandin, Ch.-A.
Format: Article
Language:English
Subjects:
Casting alloys
Chemical diffusion
Nickel base alloys
Solid phases
Solidification
Superalloys
Supercooling
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Summary:During casting, diffusion phenomena are often simplified by Lever-Rule or GulliverScheil hypotheses, thus simplifying chemical diffusion to extreme configurations. The present work proposes an extension of the Tong-Beckermann microsegregation model to multi-component alloys while considering finite diffusion in liquid and solid phases plus the effect of tip undercooling of the columnar front. The behaviour of this model is studied according the solidification conditions (growth velocity and thermal gradient) and comparison with microprobe measurements is proposed for a seven components nickel-base superalloy.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/529/1/012029