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Microscopic phase-field study for oriented diffusion channel effect of nickel-based alloy and phases’ effect mechanism. (English) Zbl 1237.74155

Summary: A microscopic phase-field model was used to investigate the effect of the oriented diffusion channel and the phases’ effect mechanism for the Ni\(_{75}\)Al\(_{6.0}\)V\(_{19.0}\) alloy during a phase transformation process. A diffusion channel of V was formed in the [100] direction. The oriented growth of DO\(_{22}\) in this direction, when an elastic misfit stress field existed, forced Al to form a diffusion channel next to DO\(_{22}\), resulting in L1\(_{2}\)-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.

MSC:

74N25 Transformations involving diffusion in solids
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