Publication result detail

Dynamic stability of Ni fcc crystal under isotropic tension

ŘEHÁK, P.; ČERNÝ, M.

Original Title

Dynamic stability of Ni fcc crystal under isotropic tension

English Title

Dynamic stability of Ni fcc crystal under isotropic tension

Type

WoS Article

Original Abstract

Phonon spectra of Ni lattice are calculated for several crystal volumes. Phonon dispersions of unstressed crystal are in a very good agreement with experimental data. Under isotropic expansion, the lattice softens and, according to the results, strength of the crystal is determined by occurrence of an instability related to soft phonons with finite wave vector. On the other hand, the critical strains and stresses associated with such instabilities are only slightly lower than those related to the volumetric instability.

English abstract

Phonon spectra of Ni lattice are calculated for several crystal volumes. Phonon dispersions of unstressed crystal are in a very good agreement with experimental data. Under isotropic expansion, the lattice softens and, according to the results, strength of the crystal is determined by occurrence of an instability related to soft phonons with finite wave vector. On the other hand, the critical strains and stresses associated with such instabilities are only slightly lower than those related to the volumetric instability.

Keywords

lattice dynamics, phonon instability, isotropic loading, ab initio calculations

Key words in English

lattice dynamics, phonon instability, isotropic loading, ab initio calculations

Authors

ŘEHÁK, P.; ČERNÝ, M.

RIV year

2015

Released

01.01.2014

Publisher

Trans Tech Publication

Location

Zurich

ISBN

1013-9826

Periodical

Key Engineering Materials (print)

Volume

592-593

Number

1

State

Swiss Confederation

Pages from

47

Pages to

50

Pages count

4

BibTex

@article{BUT100974,
  author="Petr {Řehák} and Miroslav {Černý}",
  title="Dynamic stability of Ni fcc crystal under isotropic tension",
  journal="Key Engineering Materials (print)",
  year="2014",
  volume="592-593",
  number="1",
  pages="47--50",
  doi="10.4028/www.scientific.net/KEM.592-593.47",
  issn="1013-9826"
}