Abstract
The precipitation process of Ni75AlxV25-x alloy is investigated with the inversion algorithm and microscopic phase field model. The paper aims to focus on the application of the inversion algorithm and the influence of the corresponding interatomic interaction potentials on the precipitation mechanism. It is found that: for the same Al concentration, the interatomic interaction energy between Ni atom and Al atom of L1(2) phase and that between Ni atom and V atom of DO22 phase increases with the aging temperature. However, the Ni/Al interatomic interaction potentials of L1(2) (DO22) phase increase (decrease) with the increase of Al atom concentration at constant temperature. When the temperature is 1046.5 K and the concentration of Al is 0.06, the Ni/Al interatomic interaction potentials of L1(2) phase are consistent with the first principles calculation by Chen L. Q., indicating the reliability of the inversion algorithm. At the same time, the relationship between the precipitation sequence of medium-Al concentration alloy and the interaction potential between atoms are discussed. If the first nearest neighbor interatomic interaction energy of L1(2) phase is greater than (less than) that of DO22 phase, then L1(2) (DO22) phases will precipitate preferentially. Besides, the L1(2) and DO22 precipitate simultaneously when the concentration of Al atoms is equal to 0.0586.