Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultrasonic investigation of the interaction hydrogen-dislocations in
  copper crystals   In this paper we present experimental data of ultrasonic velocity and
attenuation obtained in a high purity crystalline sample of cooper hydrogenated
by gaseous charge. The sample is oriented in the <111> crystallographic
direction and aged for this work in three stages between 64 and 97 days. The
results indicate that the hydrogen is mainly segregated at the dislocation
core, inhibiting the Hydrogen Snoek-K\"oster relaxations verified at earlier
aging stages. Despite of this, a contribution to viscosity in the kink-chain
resonance is provided by the mobile hydrogen in the dislocations core by its
side movement along the dislocation line. At temperatures at which the hydrogen
begins to freeze in the lattice the geometrical kinks find a gradual increase
on the hindering of their movements along dislocation lines, becoming immobile
when the hydrogen is completely frozen in the crystal, anchoring the
dislocations in short loops. Although the viscosity associated with the mobile
hydrogen is removed, the resonance associated with geometrical kinks is not
completely cancelled. The interaction hydrogen-dislocation can be fully
described in terms of kinks in dislocations.

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The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
19
The categories of this paper are: eess
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin