Study for the effect of strain energy on pre-precipitation phase in Ni₇₅Al₁₅V₁₀ alloy using the microscopic phase-field method

The effect of strain energy on pre-precipitation phase in Ni₇₅Al₁₅V₁₀ alloy was studied using the microscopic phase-field method. It is found that the initial state of strain energy in the alloy has an effect on precipitation of L1₀ phase. L1₀ phase does not precipitate unless the effect of strain energy is considered. The larger the strain energy is, the shorter the nucleation incubation periods of L1₀ phase are, and the more obvious the characteristics of precipitated L1₀ phase are. Meantime the volume fraction and the lifetime of precipitated L1₀ phase also increase as the strain energy increases. When the strain energy is small, L1₀ phase precipitates in some areas of the disordered matrix firstly, and then the transformation from L1₀ to L1₂ phase occurs; however, in other regions L1₂ phase precipitate directly. When the strain energy becomes larger, L1₀ phase precipitate in most areas of the matrix, followed by part of these L1₀ phase dissolving, and the undissolved L1₀ phase would transform into L1₂ phase finally.