Phase-field investigation of rod eutectic morphologies under geometrical confinement

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2011-07-29
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Şerefoğlu, Melis
Plapp, Mathis
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Napolitano, Ralph
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Materials Science and Engineering

The Department of Materials Science and Engineering teaches the composition, microstructure, and processing of materials as well as their properties, uses, and performance. These fields of research utilize technologies in metals, ceramics, polymers, composites, and electronic materials.

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The Department of Materials Science and Engineering was formed in 1975 from the merger of the Department of Ceramics Engineering and the Department of Metallurgical Engineering.

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1975-present

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Three-dimensional phase-field simulations are employed to investigate rod-type eutectic growth morphologies in confined geometry. Distinct steady-state solutions are found to depend on this confinement effect with the rod array basis vectors and their included angle (α) changing to accommodate the geometrical constraint. Specific morphologies are observed, including rods of circular cross sections, rods of distorted (elliptical) cross sections, rods of peanut-shaped cross-sections, and lamellar structures. The results show that, for a fixed value of α>10∘, the usual (triangular) arrays of circular rods are stable in a broad range of spacings, with a transition to the peanut-shaped cross sectioned rods occurring at large spacings (above 1.5 times the minimum undercooling spacing λm), and the advent of rod eliminations at low spacings. Furthermore, a transition from rod to lamellar structures is observed for α<10∘ for the phase fraction of 10.5% used in the present paper.

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This article is from Physical Review E 84 (2011): 011614, doi:10.1103/PhysRevE.84.011614.

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Sat Jan 01 00:00:00 UTC 2011
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