Microscopic phase-field study for oriented diffusion channel effect of nickel-based alloy and phases' effect mechanism

In this paper, a microscopic phase-field model was used to investigate the effect of the oriented diffusion channel and the phases' effect mechanism for the Ni₇₅Al_6.0V_19.0 alloy during a phase transformation process. A diffusion channel of V was formed in the [100] direction. The oriented growth of DO₂₂ in this direction, when an elastic misfit stress field existed, forced Al to form a diffusion channel next to DO₂₂, resulting in L1₂-oriented growth. With an increase in stress, the oriented growth increased initially and then decreased. At a higher stress, the average values of the occupation probability for V atoms became constant later while Al atoms earlier.