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本文在Bragg-Williams-Gorsky近似的基础上建立了一种计算CsCl型有序相在有序-无序转变时的自由能变化的简明模型,以使计算任一成份的bcc结构的固溶体在任一温度下的自由能成为可能。本文利用这一模型计算了与铝镍钴永磁合金有关的三元系的两相分解面(Miscibility gap);讨论了有序-无序转变及铁磁性转变对两相分解的影响;确定了两相分解面的形态学特征;明确了Fe-Ni-Al三元系中的两相分解面系起因于NiAl相的有序-无序转变。Meijering的理解论仅仅处理了顺磁无序态的自由能,因而不能用来定量分析两相分解行为。本文为后续三篇论文的基础部分。
Based on the Bragg-Williams-Gorsky approximation, a simple model for calculating the free energy change of CsCl-type ordered phase during the order-disorder transition is established in this paper so that the solid solution of the bcc structure can be calculated in either Free energy at temperature is possible. In this paper, we use this model to calculate the Miscibility gap of the ternary system related to the AlNiCo magnetic alloys. The influence of the order-disorder transition and the ferromagnetic transformation on the two-phase decomposition is discussed. Morphological characteristics of the two-phase decomposition surface; clear two-phase decomposition of the Fe-Ni-Al ternary system is due to the NiAl phase ordered - disorder transition. Meijering’s theory of understanding deals only with the free energy of the paramagnetic disordered state and therefore can not be used to quantitatively analyze the behavior of biphasic decomposition. This article is the basis of the following three papers.