Origin of variable propensity for anomalousnslip in body-centered cubic metals

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F22%3A00563341" target="_blank" >RIV/68081723:_____/22:00563341 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1361-651X/ac9b79" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-651X/ac9b79</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-651X/ac9b79" target="_blank" >10.1088/1361-651X/ac9b79</a>

Result language

angličtina

Original language name

Origin of variable propensity for anomalousnslip in body-centered cubic metals

Original language description

Many transition metals crystalizing in the body-centered cubic (bcc) structurenexhibit anomalous slip on low-stressed {110} planes at low homologous tem peratures, which cannot be reconciled with the Schmid law. Specifically, fornuniaxial loading in the center of the [001] − [011] − [¯111] stereographic tri angle, this is manifested by 1/2[111] and 1/2[1¯1¯1] screw dislocations movingnon low-stressed (0¯11) planes. While the anomalous slip is often attributednto non-planar cores of 1/2⟨111⟩ screw dislocations or to the tendency forntheir networks to glide easily, it remains unclear why it dominates the plasticndeformation in some bcc metals, whereas it is weak or even absent in others.nUsing molecular statics simulations at 0 K, we demonstrate that the anomalousnslip in bcc metals is intimately linked with the stability of ⟨100⟩ screw junc tions between two intersecting 1/2⟨111⟩ screw dislocations under stress (fornexample, 1/2[111] and 1/2[1¯1¯1] screws giving rise to the [100] junction). Ournatomic-level studies show that in nearly all bcc metals of the 5th and 6th groupsnthese junctions cannot be broken by the applied stress and the three dislocationsncan only move on the common {110} plane (in the above example on the (0¯11)nplane). On the other hand, these junctions are found to be unstable in alkalinmetals, tantalum, and iron, where the application of stress results in unzippingnof the two dislocations and their further glide on the planes predicted for isol ated dislocations. These results also suggest that the experimentally observednincreased propensity for the anomalous slip in further stages of plastic deform ation may be explained by reduced curvatures of 1/2⟨111⟩ screw dislocationnin dense networks.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/GA19-23411S" target="_blank" >GA19-23411S: Interplay of plasticity and magnetism in alpha-iron and chromium</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

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

Name of the periodical

Modelling and Simulation in Materials Science and Engineering

ISSN

0965-0393

e-ISSN

1361-651X

Volume of the periodical

30

Issue of the periodical within the volume

8

Country of publishing house

GB - UNITED KINGDOM

Number of pages

21

Pages from-to

085007

UT code for WoS article

000877320500001

EID of the result in the Scopus database

2-s2.0-85141664184