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Estimation of the Critical Temperatures of Order-Disorder Phase Transitions in Cu-Au Alloys Using Short-Range Order Parameters

机译:使用短程有序参数估计Cu-Au合金中有序-无序相变的临界温度

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An expression for calculating the critical temperature of order-disorder transition in face-centered cubic alloys is developed with accounting of pairwise interatomic potential in the first eleven shells. The expression obtained was applied to estimate the critical temperatures for Cu_3Au, CuAu, and CuAu_3 alloys in comparison with experimental data from a phase diagram of the Cu-Au system. Magnitudes of the pairwise interatomic potential in the alloys studied were computed using values of the short-range order parameters which were experimentally obtained from X-ray diffuse scattering intensity. In this computation, the Krivoglaz-Clapp-Moss approximation and Cowley equations were applied.
机译:考虑到前11个壳中的成对原子间电势,提出了一种计算面心立方合金中有序-无序转变的临界温度的表达式。与来自Cu-Au系统相图的实验数据进行比较,将所得表达式用于估算Cu_3Au,CuAu和CuAu_3合金的临界温度。使用从X射线扩散散射强度实验获得的短程有序参数值,计算了所研究合金中成对原子间电势的大小。在此计算中,应用了Krivoglaz-Clapp-Moss逼近和Cowley方程。

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