Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Geometry of triple junctions during grain boundary premelting   Grain Boundaries (GB) whose energy is larger than twice the energy of the
solid/liquid interface exhibit the premelting phenomenon, for which an
atomically thin liquid layer develops at temperatures slightly below the bulk
melting temperature. Premelting can have a severe impact on the structural
integrity of a polycrystalline material and on the mechanical high temperature
properties, also in the context of crack formation during the very last stages
of solidification. The triple junction between a dry GB and the two
solid/liquid interfaces of a liquid layer propagating along the GB cannot be
defined from macroscopic continuum properties and surface tension equilibria in
terms of Young's law. We show how incorporating atomistic scale physics using a
disjoining potential regularizes the state of the triple junction and yields an
equilibrium with a well-defined microscopic contact angle. We support this
finding by dynamical simulations using a multi-phase field model with obstacle
potential for both purely kinetic and diffusive conditions. Generally, our
results should provide insights on the dynamics of GB phase transitions, of
which the complex phenomena associated with liquid metal embrittlement are an
example.

10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga