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利用微观相场动力学模型模拟研究873K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L12结构的γ’相(Ni3Al1-xCrx)。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,L12相内Cr原子的浓度接近饱和值。在L12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(D022结构)。该合金最终沉淀产物为Ni3Al-Ni3Cr混合相。
Microscopic Phase Field Dynamics Model Simulation of Cr Atomic Substitution in Ni75CrxAl25-x Alloy at. During the precipitation of the alloy, the Cr atoms partially replace the lattice of Al atoms to form the γ ’phase (Ni3Al1-xCrx) of the L12 structure. Cr atoms in the L12 phase placeholder probability limit is small, when the Cr content exceeds 3%, L12 phase Cr atom concentration close to saturation. At the ordered boundaries of the L12 phase, the Cr atoms completely replace the Al atom, forming a stable Ni3Cr phase (D022 structure). The final precipitation of the alloy is Ni3Al-Ni3Cr mixed phase.