Analysis of free dendritic growth considering both relaxation effect and effect of nonisothermal and nonisosolutal interface. (May 2019)

• Record Type: Journal Article
• Authors: Liu, Shucheng; Li, Shu; Liu, Feng
• Is Part Of: International journal of heat and mass transfer. Volume 134(2019)
• Page Start: 51
• Page End: 57
• Publication Date: 2019-05
• Subjects: Modelling -- Dendritic solidification -- Binary alloys -- Relaxation effect -- Nonisothermal and nonisosolutal interface; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2019.01.020
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: An extended free dendritic growth model is developed for binary alloys. Results show that it is necessary to introduce the diffusion relaxation effect. Results indicate the effect of the nonisothermal nature of interface is significant. The effect of the nonisosolutal nature of interface is very slight and negligible. Abstract: Through considering both the relaxation effect of local nonequilibrium solute diffusion in bulk liquid and the effect of nonisothermal and nonisosolutal nature of the solid–liquid interface, a further improved version of free dendritic growth model was proposed, for binary alloys. Comparative analysis indicates that the effect of the nonisothermal nature of the interface is significant and this effect should be taken into account in modeling the free dendritic growth. It is also concluded that the effect of the nonisosolutal nature of interface is very slight and really negligible. Thus, the simplified version of free dendritic growth model taking into account the nonisothermal nature of the interface and with an isosolutal interface assumption is reasonable. Furthermore, experimental comparison demonstrates that it is necessary to introduce the diffusion relaxation effect for achieving a good agreement between the model predictions with the available experiment data, especially at high undercoolings, for the Cu70 Ni30 alloy.