钒浓度与Ni_(75)Al_(25-x)V_x合金形核孕育期的相关性研究

Study on the Correlation between Vanadium Concentration and Nucleation Incubation Period of Ni_(75)Al_(25-x)V_x Alloy

基于微观相场动力学模型,用原子形貌演化图、平均序参数等研究钒(V)原子浓度与Ni75Al25-xVx合金沉淀析出L12相和D022相的形核孕育期的相关性。结果表明,若V元素的浓度在不同区间变化,则Ni75Al25-xVx合金沉淀析出L12和D022两相的孕育期也发生变化,两者呈现完全不同的相关性:当9.0≤x<19.7时,两相的孕育期与V浓度呈正相关性,且D022相的孕育期长于L12相的孕育期;当19.7<x≤23.0时,两相的孕育期与V浓度呈负相关,且L12相的孕育期长于D022的孕育期;当x=19.7时,两相的孕育期几乎一样长。

The correlation between the concentration of vanadium （V） and the nucleation incubation period of L12 order phase and D022 order phase precipitated from Ni75A125-xVx alloy was investigated by atom morphology evolution and average order parameters based on the microscopic phase dynamic model. The computer simulations demonstrate that with the variation of vanadium concentration in different ranges, the nucleation incubation periods change for L12 order phase and D022 order phase precipitated from Ni75A125-xVx, and they present totally diverse correlation. When x is between 9.0 and 19.7, the incubation periods of two phases and V content show positive correlation, and the incubation period of D022 is longer than that of L12. When x is between 19.7 and 23.0, the incubation periods of two phases and V content show negative correlation, and the incubation period of L12 is longer than that of D022. When x is equal to 19.7, the difference between their nucleation incubation periods is not obvious.