Measurement of the Gibbsian interfacial excess of solute at an interface of arbitrary geometry using three-dimensional atom probe microscopy

Hellman, Olof C.; Seidman, David N.

doi:10.1016/s0921-5093(01)01885-8

Cited by 97 publications

(35 citation statements)

References 7 publications

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“…However, because d is coupled to X, the interfacial volume fraction varies with global composition, making it very difficult to analyze the segregation behavior from a characteristic isotherm. To address this complexity, we turn our attention to the Gibbsian excess, or intergranular solute excess, ⌫, 31,50 which is derived by considering the distribution of atoms, N, in the system,…”

Section: Equilibrium Equationsmentioning

confidence: 99%

Grain boundary segregation and thermodynamically stable binary nanocrystalline alloys

2009

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A free-energy function for binary polycrystalline solid solutions is developed based on pairwise nearestneighbor interactions. The model permits intergranular regions to exhibit unique energetics and compositions from grain interiors, under the assumption of random site occupation in each region. For a given composition, there is an equilibrium grain size, and the alloy configuration in equilibrium generally involves solute segregation. The present approach reduces to a standard model of grain boundary segregation in the limit of infinite grain size, but substantially generalizes prior thermodynamic models for nanoscale alloy systems. In particular, the present model allows consideration of weakly segregating systems, systems away from the dilute limit, and is derived for structures of arbitrary dimensionality. A series of solutions for the equilibrium alloy configuration and grain size are also presented as a function of simple input parameters, including temperature, alloy interaction energies, and component grain boundary energies.

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Section: Equilibrium Equationsmentioning

confidence: 99%

Grain boundary segregation and thermodynamically stable binary nanocrystalline alloys

2009

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“…Where A n is the effective area of a slice at proximity n, N n is the number of atoms in the slice, ∆n is the shell thickness, and ρ is the ideal atomic density of (Ni 0.98 Pd 0.02 )Si. The proxigram yields a discrete count of the atoms in the vicinity of this heterophase interface, thus permitting a direct determination of Г s [16]. The Gibbsian interfacial excess of Pd at this heterophase interface is determined to be 3.4±0.2 atoms The addition of small concentrations of a transition metal, M, (where M = Pt or Pd) to Ni films on Si(100) is known to have two beneficial effects on the nickel monosilicide phase formed employing RTA [10].…”

Section: Ecs Transactions 19 (1) 303-314 (2009)mentioning

confidence: 99%

Three-Dimensional Atom-Probe Tomographic Studies of Nickel Monosilicide/Silicon Interfaces on a Subnanometer Scale

Adusumilli¹,

Murray²,

Lauhon³

et al. 2009

ECS Trans.

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Three-dimensional atom-probe tomography was utilized to study the distribution of M (M = Pt or Pd) after silicidation of a solidsolution Ni 0.95 M 0.05 thin-film on Si(100). Both Pt and Pd segregate at the (Ni 1-x M x )Si/Si(100) heterophase interface and may be responsible for the increased resistance of (Ni 1-x M x )Si to agglomeration at elevated temperatures. Direct evidence of Pt short-circuit diffusion via grain boundaries, Harrison regime-B, is found after silicidation to form (Ni 0.99 Pt 0.01 )Si. This underscores the importance of interfacial phenomena in stabilizing this lowresistivity phase, providing insights into the modification of NiSi texture, grain size, and morphology caused by Pt. The relative shift in work function between as-deposited and annealed states is greater for Ni(Pt)Si than for NiSi as determined by Kelvin probe force-microscopy. The nickel monosilicide/Si heterophase interface is reconstructed in three-dimensions and its chemical roughness is evaluated.

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“…[37] Compositional analyses of the precipitates, their heterophase interfaces, and matrix were performed with the proximity histogram method (proxigram for short), giving compositional profiles with respect to distance from an isoconcentration surface. [37][38][39] The Cu-rich precipitates were delineated by a 5 at. pct Cu isoconcentration surface.…”

Section: E Atom-probe Tomographymentioning

confidence: 99%

High-Strength Low-Carbon Ferritic Steel Containing Cu-Fe-Ni-Al-Mn Precipitates

Vaynman

Isheim

Kolli³

et al. 2008

Metall Mater Trans A

110

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An investigation of a low-carbon, Fe-Cu-based steel, for Naval ship hull applications, with a yield strength of 965 MPa, Charpy V-notch absorbed impact-energy values as high as 74 J at -40°C, and an elongation-to-failure greater than 15 pct, is presented. The increase in strength is derived from a large number density (approximately 10 23 to 10 24 m -3 ) of copper-iron-nickelaluminum-manganese precipitates. The effect on the mechanical properties of varying the thermal treatment was studied. The nanostructure of the precipitates found within the steel was characterized by atom-probe tomography. Additionally, initial welding studies show that a brittle heat-affected zone is not formed adjacent to the welds.

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Measurement of the Gibbsian interfacial excess of solute at an interface of arbitrary geometry using three-dimensional atom probe microscopy

Cited by 97 publications

References 7 publications

Grain boundary segregation and thermodynamically stable binary nanocrystalline alloys

Grain boundary segregation and thermodynamically stable binary nanocrystalline alloys

Three-Dimensional Atom-Probe Tomographic Studies of Nickel Monosilicide/Silicon Interfaces on a Subnanometer Scale

High-Strength Low-Carbon Ferritic Steel Containing Cu-Fe-Ni-Al-Mn Precipitates

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