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Article
Using First-Principles Calculations in CALPHAD Models to Determine Carrier Concentration of the Binary PbSe Semiconductor
PbSe is a promising thermoelectric that can be further improved by nanostructuring, band engineering, and carrier concentration tuning; therefore, a firm understanding of the defects in PbSe is necessary. The ...
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Article
Open AccessThe Three-Dimensional Morphology of Growing Dendrites
The processes controlling the morphology of dendrites have been of great interest to a wide range of communities, since they are examples of an out-of-equilibrium pattern forming system, there is a clear conne...
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Article
Liquid droplet dynamics and complex morphologies in vapor–liquid–solid nanowire growth
The morphology of semiconducting nanowires, including kinked and branched wires, must be controlled in order to produce functional devices. Here, we describe some of the experimental and theoretical work invol...
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Article
First-principles calculation of the effect of strain on the diffusion of Ge adatoms on Si and Ge (001) surfaces
First-principles calculations are used to calculate the strain dependencies of the binding and diffusion-activation energies for Ge adatoms on both Si(001) and Ge(001) c(4×2) reconstructed surfaces. Our calcul...
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Article
Phase field modeling of grain growth: effect of boundary thickness, triple junctions, misorientation, and anisotropy
Phase-field models based on multiple order parameters are used extensively to study grain growth in polycrystalline materials. However, if simulations are to be carried out using experimentally obtained micros...
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Article
Morphological analysis of pores in directionally freeze-cast titanium foams
Synchrotron x-ray tomography was performed on titanium foams with aligned, elongated pores, initially created by sintering directionally freeze-cast preforms using two different powder sizes. Three-dimensional...
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Article
Analysis of Complex Microstructures: Serial Sectioning and Phase-Field Simulations
With the emergence and evolution of serial sectioning techniques that allow for three-dimensional data collection and the continuing increase in computational power, it is now possible to analyze and compute t...
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Article
Convection in a Mushy Zone Forced by Sidewall Heat Losses
We calculate the convective state due to weak sidewall heat losses in a mushy zone during the steady directional solidification of a binary alloy. The configuration consists of a warm liquid region and a cold ...
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Article
Measurements of the grain boundary energy and anisotropy in tin
The three-dimensional (3-D) geometry of the triple junction formed between two solid Sn-rich particles and a Pb-rich liquid matrix is used to measure the interfacial energy and its anisotropy for individual gr...
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Article
Topological complexity and the dynamics of coarsening
Coarsening or Ostwald ripening occurs in a vast array of two-phase systems. Coarsening results in a decrease in the interfacial area per unit volume and a concomitant increase in the size scale of the interfac...
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Article
The morphological evolution of dendritic microstructures during coarsening
The coarsening process in systems consisting of spherical particles in a matrix has been studied extensively. In contrast, coarsening in systems that possess both positive and negative curvature, such as those...
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Article
Determining the three-dimensional morphology of γ′-particles in γ-γ′ superalloys
We propose qualitative and quantitative methods for determining the three-dimensional morphology of second-phase particles in Ni-based superalloys in the late stages of coarsening. Qualitatively, we determine ...
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Article
The influence of temperature gradients on ostwald ripening
Numerical simulations are used to study particle coarsening in the presence of a small linear temperature gradient in a system containing 10 and 20 pct volume fractions of coarsening phase. Temperature gradien...
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Article
Texture evolution and the role of grain boundaries in skeletal formation during coarsening in solid-liquid mixtures
During coarsening of high-volume-fraction solid-liquid mixtures, a solid skeleton is formed. Electron back-scattered diffraction (EBSD) analysis of Sn particles in a liquid Pb-Sn eutectic is employed to yield ...
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Article
Interfacial Stress, Interfacial Energy, and Phase Equilibria in Binary Alloys
A simple model is presented in order to explore the influence of interfacial stress, interfacial energy, and surface stress on the characteristics of phase equilibria in stressed, two-phase binary alloys. Two ...
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Article
Ostwald ripening of solid-liquid Pb-Sn dispersions
An experimental study on the influence of a finite volume fraction of solid on Ostwald ripening of Pb-Sn dispersions is presented. Dispersions of lead particles in a near-eutectic Pb-Sn liquid were stabilized ...
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Article
Ostwald ripening in ternary alloys
A theory of coarsening in an isothermal, ternary alloy is developed in an effort to understand the effects of a third chemical component on the ripening behavior of a two-phase system. The analysis is valid fo...
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Article
The Stability of Lattice Mismatched Thin Films
We examine the linear stability of a planar, alloy thin film, exposed to a deposition flux from the vapor. The film surface is subject to stresses generated by compositional inhomogeneity, as well as by film-s...
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Article
Solute distribution around a coherent precipitate in a multicomponent alloy
The open system elastic constants for a multicomponent alloy are derived and used to determine the equilibrium solute concentration profile surrounding an isolated coherent M2C carbide precipitate with a transfor...
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Article
Coherent phase equilibrium in alloys with congruent points
The effects of elastic stress on phase equilibrium are examined for an alloy system possessing a congruent point in the absence of stress. The stress-free molar free energies of each of the phases are represen...
