Dislocation dissociations in C11(b) MoSi2 and their impact on
its plastic deformation

J 2018

Dislocation dissociations in C11(b) MoSi2 and their impact on its plastic deformation

PAIDAR, V.; M. CAK; Mojmír ŠOB a V. VITEK

Základní údaje

Originální název

Dislocation dissociations in C11(b) MoSi2 and their impact on its plastic deformation

Autoři

PAIDAR, V.; M. CAK; Mojmír ŠOB a V. VITEK

Vydání

Intermetallics, Oxford, Elsevier Science, 2018, 0966-9795

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10403 Physical chemistry

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.353

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/18:00106470

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

Hexagonal metals; Mechanical properties; Twinning

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 23. 4. 2024 14:18, Mgr. Michal Petr

Anotace

V originále

Using the DFT calculated gamma-surfaces possible metastable stacking faults have been found for the most common slip planes {013) and {110) in MoSi2. These calculations reveal three distinct stacking faults on {013) planes and one stacking fault on {110) plane. Owing to such multiplicity of metastable stacking faults there is a large number of possible dislocation dissociations. These dislocation splittings are analysed using the anisotropic elasticity and relevant stacking faults. The results show that the only dissociations of the < 331] dislocations favoured over the complete undissociated dislocations are on {013) planes either in one or two planes of this type. Splitting into {110) planes are never favoured. For the screw dislocation the dissociations on {013) planes lead to configurations that are sessile and block the dislocations glide in the case of compression along the [001] axis. This explains why for this orientation of compressive axis the single crystals are brittle at ambient temperature but dislocation glide may occur for compressive loading along different, less symmetrical directions. For the loading along the [001] axis the dislocation glide may take place at high temperatures when the cross slip releases the sessile screw dislocations on two {013) planes.

Návaznosti

LQ1601, projekt VaV

Název: CEITEC 2020 (Akronym: CEITEC2020)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, CEITEC 2020

Citovat

PAIDAR, V.; M. CAK; Mojmír ŠOB a V. VITEK. Dislocation dissociations in C11(b) MoSi2 and their impact on its plastic deformation. Intermetallics. Oxford: Elsevier Science, 2018, roč. 97, JUN, s. 34-41. ISSN 0966-9795. Dostupné z: https://doi.org/10.1016/j.intermet.2018.03.003.

@article{1503182,
   author = {Paidar, V. and Cak, M. and Šob, Mojmír and Vitek, V.},
   article_location = {Oxford},
   article_number = {JUN},
   doi = {https://doi.org/10.1016/j.intermet.2018.03.003},
   keywords = {Hexagonal metals; Mechanical properties; Twinning},
   language = {eng},
   issn = {0966-9795},
   journal = {Intermetallics},
   title = {Dislocation dissociations in C11(b) MoSi2 and their impact on its plastic deformation},
   url = {http://dx.doi.org/10.1016/j.intermet.2018.03.003},
   volume = {97},
   year = {2018}
}

TY  - JOUR
ID  - 1503182
AU  - Paidar, V. - Cak, M. - Šob, Mojmír - Vitek, V.
PY  - 2018
TI  - Dislocation dissociations in C11(b) MoSi2 and their impact on its plastic deformation
JF  - Intermetallics
VL  - 97
IS  - JUN
SP  - 34-41
EP  - 34-41
PB  - Elsevier Science
SN  - 09669795
KW  - Hexagonal metals
KW  - Mechanical properties
KW  - Twinning
UR  - http://dx.doi.org/10.1016/j.intermet.2018.03.003
N2  - Using the DFT calculated gamma-surfaces possible metastable stacking faults have been found for the most common slip planes {013) and {110) in MoSi2. These calculations reveal three distinct stacking faults on {013) planes and one stacking fault on {110) plane. Owing to such multiplicity of metastable stacking faults there is a large number of possible dislocation dissociations. These dislocation splittings are analysed using the anisotropic elasticity and relevant stacking faults. The results show that the only dissociations of the < 331] dislocations favoured over the complete undissociated dislocations are on {013) planes either in one or two planes of this type. Splitting into {110) planes are never favoured. For the screw dislocation the dissociations on {013) planes lead to configurations that are sessile and block the dislocations glide in the case of compression along the [001] axis. This explains why for this orientation of compressive axis the single crystals are brittle at ambient temperature but dislocation glide may occur for compressive loading along different, less symmetrical directions. For the loading along the [001] axis the dislocation glide may take place at high temperatures when the cross slip releases the sessile screw dislocations on two {013) planes.
ER  -

PAIDAR, V.; M. CAK; Mojmír ŠOB a V. VITEK. Dislocation dissociations in C11(b) MoSi2 and their impact on its plastic deformation. \textit{Intermetallics}. Oxford: Elsevier Science, 2018, roč.~97, JUN, s.~34-41. ISSN~0966-9795. Dostupné z: https://doi.org/10.1016/j.intermet.2018.03.003.

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