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利用微观相场模型研究了有序畴界结构、合金成分和弹性应变能对Ni75AlxV25-x合金中L12-Ni3Al相间有序畴界成分的影响规律。结果表明:L12相间形成的3种有序畴界中,在(100)//(200)·[001]处,Ni的贫化程度最小,Al的贫化程度最大,V的偏聚程度最大;在(200)//(200)处,Ni的贫化程度最大,Al的贫化程度最小,V的偏聚程度最小。随着合金中Al浓度的增加,3种有序畴界处Ni的浓度降低,Al的浓度升高,V的浓度降低。弹性应变能使得L12相间3种有序畴界处Ni和Al的浓度升高,V浓度降低。但弹性应变能对(200)//(200)·[001]和(100)//(200)·[001]成分的影响较大,对(200)//(200)成分的影响则相对较小。
The effect of ordered domain structure, alloy composition and elastic strain energy on the ordered composition of L12-Ni3Al phase in Ni75AlxV25-x alloy was studied by using the micro-phase field model. The results show that among the three kinds of ordered domains formed by L12, Ni is the least depleted at (100) // (200) · [001], Al is the most depleted, and V is maximally segregated ; At (200) // (200), Ni is the most depleted, Al is least depleted, and V is least aggregated. With the increase of Al concentration in the alloy, the concentration of Ni, the concentration of Al and the concentration of V in the three kinds of ordered domains decreased. The elastic strain enables the concentrations of Ni and Al in the three ordered boundaries of L12 phase to increase and the V concentration to decrease. (200) // (200) · [001] and (100) // (200) · [001] components have a greater effect on the (200) // (200) components than the elastic strain energy Smaller.