1. Influence of Ni on Cu precipitation in Fe—Cu—Ni ternary alloy by an atomic study
- Author
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Zhao Shi-Jin and Zhu Lu-Shan
- Subjects
Mean squared displacement ,Molecular dynamics ,Materials science ,Precipitation (chemistry) ,Diffusion ,Alloy ,Analytical chemistry ,engineering ,General Physics and Astronomy ,Density functional theory ,engineering.material ,Ternary operation ,k-nearest neighbors algorithm - Abstract
The early aging Cu precipitations in Fe—3%Cu and Fe—3%Cu—4%Ni ternary alloys are investigated by molecular dynamics (MD) simulations. The results show that the average size of Cu clusters in Fe—3%Cu—4%Ni alloy is larger than that in Fe—3%Cu alloy. The diffusion of Cu is accelerated by Ni according to the mean square displacement (MSD). Furthermore, the whole formation process of Cu-rich clusters is analyzed in detail, and it is found that the presence of Ni promotes small Cu-rich clusters to be combined into big ones. Ni atoms prefer to stay at the combination positions of small clusters energetically due to a large number of the first nearest neighbor Cu—Ni interactions, which is verified by first-principles calculations based on density functional theory (DFT).
- Published
- 2014