Analysis of phase and structural transformations in ternary systems by the computer-thermodynamic methods : A review
Analysis of phase and structural transformations in ternary systems by the computer-thermodynamic methods : A review
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用计算机热力学方法分析三元系统中的相和结构转变：综述
DOI：
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发表时间：
2001
影响因子：
1.2
通讯作者：
D. V. Shtanskii
中科院分区：
文献类型：
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作者：
D. V. Shtanskii
综述了计算机热力学领域应用于多组分体系扩散转化的最新成果。本文介绍了通过构造相图等温截面求出所有运动界面的热力学活度，从而确定碳元素和合金元素在三元系相变过程中扩散的驱动力的方法。这种方法使人们能够定性地了解固相转变的机制和动力学，而不需要严格地求解扩散方程。作为例子，讨论了一系列复杂的扩散相变，即合金马氏体的不连续析出分解，M23C6碳化物在加热时按共析反应分解，渗碳体在钢奥氏体化过程中的魏氏反应分解，碳化物在原位加热时的转变，奥氏体的形成和复杂碳化物的溶解。在许多情况下，它显示了如何有效地使用热力学和动力学理论来解释相变。
The latest accomplishments in the field of computer thermodynamics as applied to the diffusion transformations in multicomponent systems are reviewed. The methods of determining the driving forces for the diffusion of carbon and alloying elements upon phase transformations in ternary systems by finding the thermodynamic activity at all moving interfaces with the help of the construction of isothermal sections of phase diagrams are described. This approach allows one to qualitatively understand the mechanism and kinetics of solid-phase transformations without rigorously solving the diffusion equation. As an example, a number of complex diffusional transformations are considered, namely, the decomposition of the alloyed martensite by discontinuous precipitation; the decomposition of the M 23 C 6 carbides upon heating according to the eutectoid reaction; the cementite decomposition during steel austenitizing by the Widmanstatten-type reaction; the carbide transformation upon heating in situ; the austenite formation; and dissolution of the complex carbides. In a number of cases, it is shown how the thermodynamic and kinetic theories can be efficiently used to interpret phase transformations.