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中文摘要：
通过微观相场方法研究了Ni75Al15Cr10合金第三，四层原子间对势对y’相中Cr原子替代行为的影响。结果表明：从y’相的Al、Cr原子长程序参数的演化可以看出，Cr的长程有序度小于1，Cr原子对Al，Ni均有替代，且第三层与第四层原子间对势对Cr原子在y’相中的饱和溶解度趋势的影响相反。而第三层Ni-Al、Ni-Cr对势增大，使Cr占据a亚格点位置的几率减小，口格点位置的几率增大，第四层Ni-Al、Ni-Cr对势的作用与之相反，而Al-Cr第三层对势的增大使Cr占据2种亚格点位置的几率均有所增大，第四层Al-Cr对势的增大使Cr占据α格点位置的几率减小，占据声格点位置的几率增大。
英文摘要：
The effects of the Cr substitutional behavior in the different third and fourth nearest interactive potential is studied by the phase field method in Ni75Al15Cr20 at temperature 873 K. The results show： the evolution of the Cr long range order parameter demonstrates the existence of Cr＇s substitution for both Ni and Al sites in L12 type ordered structure, and whose solubility in y＇ phase is opposite between the third and fourth shell potential. Besides that, with the increase of the Ni-Al, Ni-Cr third nearest pairwise potential, the occupation of Cr at α sublattice sites enhance while β site＇s occupation falls down, but for the Ni-Al, Ni-Cr third nearest pairwise potential, this tendency reverse As the Al-Cr third pairwise potential increase, the Cr occupation at α and β sites increase. Otherwise the increase of the Al-Cr fourth nearest pairwise potential promotes Cr＇s substitution for the Ni sites and decrease Cr＇s substitution for Al sites.
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