Effect of dihedral angle on the morphology of grains in a matrix phase

Park, Hyo-Hoon; Yoon, Duk N.

doi:10.1007/bf02814844

Cited by 81 publications

(49 citation statements)

References 8 publications

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“…As the dihedral angle increases over 30°, a proportionate increase in liquid content is required to sustain a connected liquid along the grain edges. For a dihedral angle over 60°, the liquid forms isolated pockets at the triple points between grains [34, 59,77,78], as given in Fig. 20.…”

Section: Grain Shapementioning

confidence: 99%

Review: liquid phase sintering

2009

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Liquid phase sintering (LPS) is a process for forming high performance, multiple-phase components from powders. It involves sintering under conditions where solid grains coexist with a wetting liquid. Many variants of LPS are applied to a wide range of engineering materials. Example applications for this technology are found in automobile engine connecting rods and high-speed metal cutting inserts. Scientific advances in understanding LPS began in the 1950s. The resulting quantitative process models are now embedded in computer simulations to enable predictions of the sintered component dimensions, microstructure, and properties. However, there are remaining areas in need of research attention. This LPS review, based on over 2,500 publications, outlines what happens when mixed powders are heated to the LPS temperature, with a focus on the densification and microstructure evolution events.

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Section: Grain Shapementioning

confidence: 99%

Review: liquid phase sintering

2009

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“…In (21), p cap is the capillary pressure [3] and the primes over letters are omitted. We assume that friction at the sample bottom is absent.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Cylindrical samples were approximately 12.8 mm in diameter and 7 mm in height. For the calculations we took the parameters values: 3 , ρ S = 18.9 g/cm 3 , t h = 1800 s, r c = 7 mm,…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The excess free energy was determined from the model, in which each particle in an aggregate is enclosed into a Voronoi cell [2]. To determine the minimum interface energy configurations of a uniformly intermixed grain-matrix system in [3], a microstructural model was used, which consisted of a rhombic dodecahedron grain in contact with the matrix at its curved surfaces along truncated edges and corners.…”

Section: Introductionmentioning

confidence: 99%

“…The materials science and continuum mechanics form the basis of the theory. In contrast to [1][2][3], we do not introduce any kind of the microstructure model. It is assumed that the microstructure is defined by the linear intercept method.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the mathematical theory of the microstructure evolution during the final stage of liquid phase sintering

Golovchan

2014

J. Superhard Mater.

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Experimental evidence for melt partitioning between olivine and orthopyroxene in partially molten harzburgite

et al. 2016

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Observations of dunite channels in ophiolites and uranium series disequilibria in mid‐ocean ridge basalt suggest that melt transport in the upper mantle beneath mid‐ocean ridges is strongly channelized. We present experimental evidence that spatial variations in mineralogy can also focus melt on the grain scale. This lithologic melt partitioning, which results from differences in the interfacial energies associated with olivine‐melt and orthopyroxene‐melt boundaries, may complement other melt focusing mechanisms in the upper mantle such as mechanical shear and pyroxene dissolution. We document here lithologic melt partitioning in olivine‐/orthopyroxene‐basaltic melt samples containing nominal olivine to orthopyroxene ratio of 3 to 2 and melt fractions of 0.02 to 0.20. Experimental samples were imaged using synchrotron‐based X‐ray microcomputed tomography at a resolution of 700 nm per voxel. By analyzing the local melt fraction distributions associated with olivine and orthopyroxene grains in each sample, we found that the melt partitioning coefficient, i.e., the ratio of melt fraction around olivine to that around orthopyroxene grains, varies between 1.1 and 1.6. The permeability and electrical conductivity of our digital samples were estimated using numerical models and compared to those of samples containing only olivine and basaltic melt. Our results suggest that lithologic melt partitioning and preferential localization of melt around olivine grains might play a role in melt focusing, potentially enhancing average melt ascent velocities.

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Effect of dihedral angle on the morphology of grains in a matrix phase

Cited by 81 publications

References 8 publications

Review: liquid phase sintering

Review: liquid phase sintering

On the mathematical theory of the microstructure evolution during the final stage of liquid phase sintering

Experimental evidence for melt partitioning between olivine and orthopyroxene in partially molten harzburgite

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