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基于微观相场动力学模型,运用原子图像、平均长程序参数和平均成分偏离序参数,研究了Al浓度对Ni75Cr25-xAlx合金中L12相和D022相形核孕育期的影响以及孕育期与沉淀相析出顺序之间的关系.结果表明,L12相和D022相的形核孕育期不仅与Al浓度有关,而且与两相析出的先后顺序密切相关.当Al浓度小于7.5%时,先析出相为D022相,随着Al浓度的增大,D022相形核孕育期延长,后析出的L12相的形核孕育期也延长,L12相的原子簇聚速度加快;当Al浓度大于7.5%时,先析出相为L12相,随着Al浓度的增大,L12相的形核孕育期缩短,后析出的D022相形核孕育期也缩短.当Al浓度为7.5%时,L12相和D022相几乎同时析出,两者的孕育期没有明显的差别.
Based on the kinetic model of microscopic phase field, the effects of Al concentration on the nucleation period of L12 phase and D022 phase in Ni75Cr25-xAlx alloy and the precipitation of precipitation phase and precipitation phase were studied by using atomic image, average long-term program parameters and average composition deviation parameters. The results show that the nucleation period of L12 phase and D022 phase is not only related to the Al concentration but also closely related to the order of precipitation of two phases.When the Al concentration is less than 7.5% , With the increase of Al concentration, the nucleation period of D022 phase was prolonged, the nucleation period of L12 phase was prolonged, and the atomic cluster speed of L12 phase was accelerated. When Al concentration was more than 7.5% L12 phase, the nucleation period of L12 phase shortened with the increase of Al concentration, and the nucleation period of D022 phase was also shortened.When Al concentration was 7.5%, L12 phase and D022 phase almost simultaneously precipitated, both The incubation period no significant difference.