通过微观相场方法研究了Ni75Al15Cr10合金第三,四层原子间对势对γ'相中Cr原子替代行为的影响.结果表明:从γ'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γ'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α亚格点位置的几率减小,β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β格点位置的几率增大.
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