title: Phase-field modeling of grain-boundary premelting using obstacle potentials.
abstract: We investigate the multiorder parameter phase field model of Steinbach and Pezzolla [Physica D 134, 385 (1999)] concerning its ability to describe grain boundary premelting. For a single order parameter situation solid-melt interfaces are always attractive, which allows us to have (unstable) equilibrium solid-melt-solid coexistence above the bulk melting point. The temperature-dependent melt layer thickness and the disjoining potential, which describe the interface interaction, are affected by the choice of the thermal coupling function and the measure to define the amount of the liquid phase. Due to the strictly finite interface thickness the interaction range also is finite. For a multiorder parameter model we find either purely attractive or purely repulsive finite-ranged interactions. The premelting transition is then directly linked to the ratio of the grain boundary and solid-melt interfacial energy.
authors.affiliation: Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany.
authors.forename: V Sai Pavan Kumar
authors.initials: VS
authors.lastname: Bhogireddy
authors.affiliation: Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Hüter
authors.affiliation: Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Neugebauer
authors.affiliation: Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universität Bochum, 44780 Bochum, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Steinbach
authors.affiliation: Physics Department and Center for Interdisciplinary Research on Complex Systems, Northeastern University, Boston, Massachusetts 02115, USA.
authors.forename: A
authors.initials: A
authors.lastname: Karma
authors.affiliation: Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Spatschek
mesh_terms: D008962:Models, Theoretical; D044367:Phase Transition