Thermodynamic and Kinetic Characteristics of Spinodal Decomposition in Ternary Alloys
Thermodynamic and Kinetic Characteristics of Spinodal Decomposition in Ternary Alloys
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三元合金旋节线分解的热力学和动力学特性
DOI：
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发表时间：
2022
影响因子：
3.2
通讯作者：
José D. Villegas
中科院分区：
文献类型：
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作者：
V. M. Lopez;Cristobal R. Escamilla;Rodrigo Calva;M. Saucedo;E. O. Avila;José D. Villegas
基于Cahn-Hilliard方程的数值解，采用相场法分析了假想A-B-C合金的相分解。研究了相互作用参数对相分解生长动力学的影响。结果表明，当三个相互作用参数均相等时，驱动力最快，促进了三元合金的最快生长动力学。相分解是独立发生的，形成了富a、富b和富c三个相。在这种情况下，旋量曲线形成了一个孤岛。如果一个或两个相互作用参数等于零，则生长动力学较慢。这一条件只导致了两个分解相的形成，根据相互作用参数的不同，这些分解相的化学成分可能是单元素，也可能是双元素。同样，旋量曲线也不完全位于等温截面内。
The phase decomposition of hypothetic A–B–C alloys was analyzed using the phase-field method based on the numerical solution of the Cahn–Hilliard equation. The effect of the interaction parameters on the growth kinetics of phase decomposition was also studied. The results indicated that the driving force was the fastest if all the three interaction parameters were equal, promoting the quickest growth kinetics of the ternary alloy. The phase decomposition occurred spinodally and caused the formation of three phases, A-rich, B-rich, and C-rich. In this case, the spinodal curve formed an isolated island. If one or two interaction parameters are equal to zero, the growth kinetics is slower. This condition originated only the formation of two decomposed phases with the chemical composition of either one element or two elements depending on the interaction parameters. Likewise, the spinodal curve is not completely located within the isothermal section.