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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 Ni75Al6.0V19.0 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.
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 Ni75Al6.0V19.0 alloy during a phase transformation process. A diffusion channel of V was formed in the [00100] direction. 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 initially and then decreased. At higher stress, the average values of the occupation probability for V atoms became constant later while Al atoms earlier.