Effect of Cr atoms on the formation of double kinks in screw dislocations in Fe and its correlation with solute hardening and softening in Fe–Cr alloys

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@article{71e99ee843bf447e97e3cd8b3e808d8d,
title = "Effect of Cr atoms on the formation of double kinks in screw dislocations in Fe and its correlation with solute hardening and softening in Fe–Cr alloys",
abstract = "We employed atomistic simulations to study the formation of a double-kink (DK) on a screw dislocation in bcc-Fe and to investigate how the presence of Cr affects it, using one of the most recent and reliable interatomic potentials for Fe and Fe–Cr systems. The formation energy of a DK of different lengths and structures, as well as the formation energies of each single kink and the interaction energies between them, have been obtained by performing large scale atomistic simulations and compared with the results obtained from elasticity theory. We show that the presence of Cr atoms, particularly Cr–Cr pairs, affects, sometimes significantly, the formation energy of DKs. The results suggest a strong dependence of the effect of solute Cr atoms on dislocation motion in Fe–Cr alloys, depending on the actual Cr distribution, which depends strongly on concentration and temperature. A framework to understand solute softening and hardening experimentally observed in Fe–Cr alloys is accordingly discussed.",
keywords = "FeCr alloys, dislocations, atomistic simulations",
author = "Dmitry Terentyev and Lorenzo Malerba and Giovanni Bonny",
note = "Score = 10",
year = "2008",
month = "5",
doi = "10.1016/j.commatsci.2008.01.072",
language = "English",
volume = "43",
pages = "855--866",
journal = "Computational Materials Science",
issn = "0927-0256",
publisher = "Elsevier",
number = "4",

}

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TY - JOUR

T1 - Effect of Cr atoms on the formation of double kinks in screw dislocations in Fe and its correlation with solute hardening and softening in Fe–Cr alloys

AU - Terentyev, Dmitry

AU - Malerba, Lorenzo

A2 - Bonny, Giovanni

N1 - Score = 10

PY - 2008/5

Y1 - 2008/5

N2 - We employed atomistic simulations to study the formation of a double-kink (DK) on a screw dislocation in bcc-Fe and to investigate how the presence of Cr affects it, using one of the most recent and reliable interatomic potentials for Fe and Fe–Cr systems. The formation energy of a DK of different lengths and structures, as well as the formation energies of each single kink and the interaction energies between them, have been obtained by performing large scale atomistic simulations and compared with the results obtained from elasticity theory. We show that the presence of Cr atoms, particularly Cr–Cr pairs, affects, sometimes significantly, the formation energy of DKs. The results suggest a strong dependence of the effect of solute Cr atoms on dislocation motion in Fe–Cr alloys, depending on the actual Cr distribution, which depends strongly on concentration and temperature. A framework to understand solute softening and hardening experimentally observed in Fe–Cr alloys is accordingly discussed.

AB - We employed atomistic simulations to study the formation of a double-kink (DK) on a screw dislocation in bcc-Fe and to investigate how the presence of Cr affects it, using one of the most recent and reliable interatomic potentials for Fe and Fe–Cr systems. The formation energy of a DK of different lengths and structures, as well as the formation energies of each single kink and the interaction energies between them, have been obtained by performing large scale atomistic simulations and compared with the results obtained from elasticity theory. We show that the presence of Cr atoms, particularly Cr–Cr pairs, affects, sometimes significantly, the formation energy of DKs. The results suggest a strong dependence of the effect of solute Cr atoms on dislocation motion in Fe–Cr alloys, depending on the actual Cr distribution, which depends strongly on concentration and temperature. A framework to understand solute softening and hardening experimentally observed in Fe–Cr alloys is accordingly discussed.

KW - FeCr alloys

KW - dislocations

KW - atomistic simulations

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_92394

UR - http://knowledgecentre.sckcen.be/so2/bibref/5286

U2 - 10.1016/j.commatsci.2008.01.072

DO - 10.1016/j.commatsci.2008.01.072

M3 - Article

VL - 43

SP - 855

EP - 866

JO - Computational Materials Science

JF - Computational Materials Science

SN - 0927-0256

IS - 4

ER -

ID: 287645