共晶体系
热力学
灰烬
材料科学
层状结构
曲率
相图
线性化
合金
相(物质)
非线性系统
物理
冶金
数学
几何学
量子力学
作者
Oriane Senninger,Charles‐André Gandin,Gildas Guillemot
标识
DOI:10.1016/j.actamat.2018.08.056
摘要
An original model of directional eutectic growth for lamellar eutectics is presented. This model is based on the analysis of thermodynamic equilibrium at the solidification front. Contrary to previous ones, this model does not use linearization hypothesis on the alloy phase diagram and takes into account variations of densities between phases. Moreover, curvature effects are considered on thermodynamic equilibrium at the solidification front. Its numerical implementation is made possible through a coupling with thermodynamic software based on the CALPHAD approach. This new numerical model is applied to the Al-Al2Cu eutectic structure and compared to the Jackson-Hunt theory. Large differences between results of the present model and this theory are observed at high growth rate. In particular, curvature effects on phases concentrations can no more be modeled using a linear approximation, as in the Gibbs-Thomson relation. A good agreement of the numerical model with reported experimental studies is observed for a large range of growth velocities.
科研通智能强力驱动
Strongly Powered by AbleSci AI