| Autor: |
Souhar, Youssef, De, Valerio F., Zaloznik, Miha, Combeau, Herve, Beckermann, Christoph |
| Zdroj: |
IOP Conference Series: Materials Science and Engineering; March 2016, Vol. 117 Issue: 1 p012014-012014, 1p |
| Abstrakt: |
The mesoscopic envelope model overcomes the limitations of phase-field methods. It can be applied at larger scales and can include fluid flow at reasonable computing cost. It consists of the description of a dendritic grain by an envelope that links the active dendrite branches. The grain is modelled as an evolving porous medium and the liquid-solid phase change and solute transport are modelled by volume-averaged equations. The velocities of the dendrite tips are determined by the local solute-concentration field in the proximity of the envelope through an analytical stagnant-film model. In this publication, we present our implementation of the model for a binary alloy and we discuss the influence of the stagnant-film thickness, the principal model parameter, on the predicted 3D equiaxed grains by comparisons with the scaling laws for binary-alloy dendrites obtained in recent experiments by Melendez and Beckermann. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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