Plastic deformation of magnetically isotropic Cr single crystals compressed at 77 K

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F21%3APU146327" target="_blank" >RIV/00216305:26620/21:PU146327 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68081723:_____/21:00540492

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0749641921000139" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0749641921000139</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijplas.2021.102938" target="_blank" >10.1016/j.ijplas.2021.102938</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Plastic deformation of magnetically isotropic Cr single crystals compressed at 77 K

Popis výsledku v původním jazyce

A series of compression tests at 77 K was carried out on chromium single crystals in magnetically isotropic state to investigate the slip activity during the first 2-4% of plastic strain. Macroscopic samples of 3 mm thickness were polished mechanically and electrolytically and their orientations determined before and after deformation by electron backscatter diffraction to assess the magnitudes and directions of crystal rotations. The crystals compressed in the direction close to [001] deformed primarily by slip on the most highly stressed (101)[111] and (101)[111] systems. Loading the crystals in the directions close to the [011] [111] edge of the stereographic triangle resulted in preferential twinning on {112}111 systems. For loading in the center-triangle region, diffraction contrast imaging in TEM reveals the presence of [100] screw junctions between intersecting 1/2[111] and 1/2 [111] screw dislocations. Using molecular statics simulations, we show that this junction does not break under the applied stress and moves together with the two dislocations on their common (011) plane. In contrast to the prediction of the Schmid law, the slip morphology for center-triangle orientations is thus dominated by anomalous slip on the low stressed (011) plane.

Název v anglickém jazyce

Plastic deformation of magnetically isotropic Cr single crystals compressed at 77 K

Popis výsledku anglicky

A series of compression tests at 77 K was carried out on chromium single crystals in magnetically isotropic state to investigate the slip activity during the first 2-4% of plastic strain. Macroscopic samples of 3 mm thickness were polished mechanically and electrolytically and their orientations determined before and after deformation by electron backscatter diffraction to assess the magnitudes and directions of crystal rotations. The crystals compressed in the direction close to [001] deformed primarily by slip on the most highly stressed (101)[111] and (101)[111] systems. Loading the crystals in the directions close to the [011] [111] edge of the stereographic triangle resulted in preferential twinning on {112}111 systems. For loading in the center-triangle region, diffraction contrast imaging in TEM reveals the presence of [100] screw junctions between intersecting 1/2[111] and 1/2 [111] screw dislocations. Using molecular statics simulations, we show that this junction does not break under the applied stress and moves together with the two dislocations on their common (011) plane. In contrast to the prediction of the Schmid law, the slip morphology for center-triangle orientations is thus dominated by anomalous slip on the low stressed (011) plane.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20300 - Mechanical engineering

Projekt

<a href="/cs/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

INTERNATIONAL JOURNAL OF PLASTICITY

ISSN

0749-6419

e-ISSN

1879-2154

Svazek periodika

138

Číslo periodika v rámci svazku

102938

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

19

Strana od-do

„102938“-„“

Kód UT WoS článku

000623869800004

EID výsledku v databázi Scopus

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