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Solute-atom segregation/structure relations at high-angle (002) twist boundaries in dilute Ni−Pt alloys

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Interface Science

Abstract

Monte Carlo simulations, utilizing embedded atom method (EAM) potentials, are employed to investigate in detail solute-atom segregation behavior at high-angle symmetrical (002) twist boundaries, at T=850 K, in Pt-3 at.% Ni and Ni-3 at.% Pt alloys. Solute enhancement in those alloys occurs on both sides of the phase diagram, although it is considerably higher on the Ni-rich side. The distributions of solute concentrations within the first and the second planes are very inhomogeneous, with the sites highly enhanced in solute being in the minority. The remaining sites exhibit little or no enhancement. The highest level of solute concentrations at individual sites continues to increase with the value of the rotations angle, θ, until saturation occurs at about the Σ=5 misorientation. The large differences in concentrations between different types of sites suggest the possibility of an ordered grain-boundary phase. The correlation between the structure and solute species concentrations in most cases follows the trends observed for low-angle boundaries: Pt as a solute prefers the structural units of the perfect crystal type, while Ni as a solute tends to segregate at the filler units associated with the cores of the primary grain boundary dislocations. A strong correlation is observed between the position of a site in the first or second (002) plane and the plane of the interface. Rigid-body translations are detected for two boundaries on the Pt-rich side of the phase diagram. Roughening and possible structural multiplicity occur in the Σ=5 boundary on the Ni-rich side. The same boundary on the Pt-rich side of the phase diagram exhibits a considerable amount of structural and chemical disorder.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, R.R. McCormick School of Engineering and Applied Science, Northwestern University, 60208-3108, Evanston, IL, USA

    D. Udler & D. N. Seidman

  2. Materials Research Center, R.R. McCormick School of Engineering and Applied Science, Northwestern University, 60208-3108, Evanston, IL, USA

    D. Udler & D. N. Seidman

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  1. D. Udler
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Udler, D., Seidman, D.N. Solute-atom segregation/structure relations at high-angle (002) twist boundaries in dilute Ni−Pt alloys. Interface Sci 3, 41–73 (1995). https://doi.org/10.1007/BF00203982

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