利用微观相场动力学模型模拟研究873 K时Ni75CrxAl25-x合金中Cr原子的替代规律.在合金沉淀过程中,Cr原子部分替代Al原子格点形成Ll2结构的γ相(Ni75CrxAl25-x).Cr原子在L12相内的占位几率极限值较小,当Cr含量超过3%时,Li2相内Cr原子的浓度接近饱和值.在Li2相的有序畴界处,Cr原子完全取代Al原子位置,形成稳定的Ni3Cr相(DO22结构).该合金最终沉淀产物为Ni75CrxAl25-x混合相.
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