Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A nonplanar Peierls-Nabarro model and its applications to dislocation
  cross-slip   A novel semidiscrete Peierls-Nabarro model is introduced which can be used to
study dislocation spreading at more than one slip planes, such as dislocation
cross-slip and junctions. The strength of the model, when combined with ab
initio calculations for the energetics, is that it produces essentiallyan
atomistic simulation for dislocation core properties without suffering from the
uncertainties associated with empirical potentials. Therefore, this method is
particularly useful in providing insight into alloy design when empirical
potentials are not available or not reliable for such multi-element systems. As
an example, we study dislocation cross-slip and constriction process in two
contrasting fcc metals, Al and Ag. We find that the screw dislocation in Al can
cross-slip spontaneously in contrast with that in Ag, where the screw
dislocation splits into two partials, which cannot cross-slip without first
being constricted. The response of the dislocation to an external stress is
examined in detail. The dislocation constriction energy and the critical stress
for cross-slip are determined, and from the latter, we estimate the cross-slip
energy barrier for straight screw dislocations.

11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph