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Control of Lamellar Eutectic Orientation Via Template-Directed Solidification

37 Pages Posted: 8 Jan 2019 First Look: Under Review

See all articles by Ashish A. Kulkarni

Ashish A. Kulkarni

University of Illinois at Urbana-Champaign - Materials Research Laboratory; University of Illinois at Urbana-Champaign - Beckman Institute for Advanced Science and Technology

Julia Kohanek

University of Illinois at Urbana-Champaign - Materials Research Laboratory; University of Illinois at Urbana-Champaign - Beckman Institute for Advanced Science and Technology

Erik Hanson

University of Michigan at Ann Arbor - Department of Materials Science and Engineering

Katsuyo Thornton

University of Michigan at Ann Arbor - Department of Materials Science and Engineering

Paul V. Braun

University of Illinois at Urbana-Champaign - Materials Research Laboratory; University of Illinois at Urbana-Champaign - Beckman Institute for Advanced Science and Technology

Abstract

Template-directed solidification of eutectics has shown promise in the synthesis of functional mesostructured materials. While eutectic systems form microstructures with a high degree of order, the structure can be further dictated by the template that introduces additional interfaces and modulates mass and heat transfer. In this study, AgCl-KCl lamellar eutectic was solidified within lithographically fabricated pillar templates and the results were compared with phase-field simulations. It was observed that the boundary effects from the template drive changes in the orientation of lamellae within the template. The system's selection of lamellar orientation was dictated by the minimum undercooling condition. We studied a range of ratios between the eutectic lamellar spacing and the pillar geometry, and determined the parameter space in which the template drives the eutectic to change its orientation. The ability to understand and deterministically control the orientation of a eutectic through use of a template is crucial to realization of specific eutectic mesostructures for photonic, heat-transfer, interfacial engineering, sensing, and energy storage applications.

Keywords: Template-directed self-organization, Eutectic solidification, Lamella, Orientation, Undercooling

Suggested Citation

Kulkarni, Ashish A. and Kohanek, Julia and Hanson, Erik and Thornton, Katsuyo and Braun, Paul V., Control of Lamellar Eutectic Orientation Via Template-Directed Solidification (January 4, 2019). Available at SSRN: https://ssrn.com/abstract=3310261

Ashish A. Kulkarni (Contact Author)

University of Illinois at Urbana-Champaign - Materials Research Laboratory

Urbana, IL 61801
United States

University of Illinois at Urbana-Champaign - Beckman Institute for Advanced Science and Technology

601 E John St
Champaign, IL 61820
United States

Julia Kohanek

University of Illinois at Urbana-Champaign - Materials Research Laboratory

Urbana, IL 61801
United States

University of Illinois at Urbana-Champaign - Beckman Institute for Advanced Science and Technology

601 E John St
Champaign, IL 61820
United States

Erik Hanson

University of Michigan at Ann Arbor - Department of Materials Science and Engineering

500 S. State Street
Ann Arbor, MI 48109
United States

Katsuyo Thornton

University of Michigan at Ann Arbor - Department of Materials Science and Engineering ( email )

500 S. State Street
Ann Arbor, MI 48109
United States

Paul V. Braun

University of Illinois at Urbana-Champaign - Materials Research Laboratory ( email )

Urbana, IL 61801
United States

University of Illinois at Urbana-Champaign - Beckman Institute for Advanced Science and Technology ( email )

601 E John St
Champaign, IL 61820
United States

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