论文标题
组成异质性对Al-Y熔体中相形成动力学的影响
Composition heterogeneity influence on the phase formation dynamics in the Al-Y melt
论文作者
论文摘要
结果表明，在对二进制溶液的描述中，在存在可变成分的液相和化学计量固相的存在下，可以引入化学电位的概念以进行化学计量，从定性地描述了这些阶段接触时杂质的重新分布的动力学。提出了一个描述最初不均匀样本中扩散过程缓慢动力学的模型。在所研究的模型中，结果表明，当偏离平衡时，杂质和混合物的相组成的相互作用会导致不稳定性的发展，即Cahn-Hilliard方程式被称为Spinodal Decay和数学描述。在该模型系统的框架内，构建了分散关系，从时间开始发现不稳定波动的增长率，并研究了模型参数对不稳定性值的影响。检测到的不稳定性可以解释在熔化玻璃形成金属合金时发生的缓慢非单调松弛的过程。
It is shown that at a description of a binary solution, in the presence of a liquid phase of variable composition and a stoichiometric solid phase, the concept of chemical potential can be introduced for stoichiometry, which qualitatively describes the dynamics of the re-distribution of the impurity at the contact of the phases. A model describing the slow dynamics of diffusion processes in an initially inhomogeneous sample is proposed. In the model under study, it is shown that the interaction of the impurity and the phase composition of the mixture, when deviating from equilibrium, leads to the development of instability, known as spinodal decay and mathematically described by the Cahn-Hilliard equation. Within the framework of this model system, a dispersion relation is constructed, from which the growth rate of unstable fluctuations from time is found and the influence of the model parameters on the instability value is investigated. The detected instability can explain the processes of slow non-monotonic relaxation that occurs when melting glass-forming metal alloys.
