Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New physics of grain boundaries in bcc metals from the atomic level:
  molybdenum as a case study   We present a systematic trend study of the symmetric tilt grain boundaries
about the <110> axis in molybdenum. Our results show that multiple structural
phases, some incorporating vacancies, compete for the boundary ground state. We
find that at low external stress vacancies prefer to bind to the boundaries in
high concentrations, and moreover, that external stress drives structural phase
transitions which correspond to switching the boundaries on and off as
pipe-diffusion pathways for vacancies. Finally, we present physical arguments
which indicate these phenomena are likely to occur in the other bcc transition
metals as well.

10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol