Interaction of a screw dislocation with Cu-precipitates, nanovoids and Cu–vacancy clusters in BCC iron

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Interaction of a screw dislocation with Cu-precipitates, nanovoids and Cu–vacancy clusters in BCC iron. / Terentyev, Dmitry; Malerba, Lorenzo; Konstantinovic, Milan (Peer reviewer).

In: Journal of Nuclear Materials, Vol. 421, No. 1-3, 01.02.2012, p. 32-38.

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@article{066ef1f6c5a44d2f9db8941cc742ee24,
title = "Interaction of a screw dislocation with Cu-precipitates, nanovoids and Cu–vacancy clusters in BCC iron",
abstract = "In a previous work we studied the interaction of a ½h111i{110} edge dislocation with Cu-rich precipitates containing also vacancies and Ni, thereby mimicking precipitates known to form in RPV steels [1]. Here, we extend the study and consider the interaction of the Cu-rich precipitates with ½h111i screw dislocations, known to govern the slip in BCC metals and alloys below room temperature. The results show that three different mechanisms take place upon interaction of a screw dislocation with pure Cu precipitates, nanovoids and Cu–vacancy clusters. Pure Cu precipitates are always sheared, while in the reaction with nanovoids local climb, especially at high temperature, is also observed. The interaction mechanisms studied at various temperatures reveal that the penetration of the screw dislocation into Cu–vacancy clusters leads to absorption of the majority of the vacancies on the dislocation line, with the consequent formation of a helical turn. The removal of the helical turn, even a very small one, from the dislocation line requires as high stress as for the passage through a row of nanovoids of comparable size.",
keywords = "PRV steel, hardening",
author = "Dmitry Terentyev and Lorenzo Malerba and Milan Konstantinovic",
note = "Score = 10",
year = "2012",
month = feb,
day = "1",
doi = "10.1016/j.jnucmat.2011.11.037",
language = "English",
volume = "421",
pages = "32--38",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",
number = "1-3",

}

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TY - JOUR

T1 - Interaction of a screw dislocation with Cu-precipitates, nanovoids and Cu–vacancy clusters in BCC iron

AU - Terentyev, Dmitry

AU - Malerba, Lorenzo

A2 - Konstantinovic, Milan

N1 - Score = 10

PY - 2012/2/1

Y1 - 2012/2/1

N2 - In a previous work we studied the interaction of a ½h111i{110} edge dislocation with Cu-rich precipitates containing also vacancies and Ni, thereby mimicking precipitates known to form in RPV steels [1]. Here, we extend the study and consider the interaction of the Cu-rich precipitates with ½h111i screw dislocations, known to govern the slip in BCC metals and alloys below room temperature. The results show that three different mechanisms take place upon interaction of a screw dislocation with pure Cu precipitates, nanovoids and Cu–vacancy clusters. Pure Cu precipitates are always sheared, while in the reaction with nanovoids local climb, especially at high temperature, is also observed. The interaction mechanisms studied at various temperatures reveal that the penetration of the screw dislocation into Cu–vacancy clusters leads to absorption of the majority of the vacancies on the dislocation line, with the consequent formation of a helical turn. The removal of the helical turn, even a very small one, from the dislocation line requires as high stress as for the passage through a row of nanovoids of comparable size.

AB - In a previous work we studied the interaction of a ½h111i{110} edge dislocation with Cu-rich precipitates containing also vacancies and Ni, thereby mimicking precipitates known to form in RPV steels [1]. Here, we extend the study and consider the interaction of the Cu-rich precipitates with ½h111i screw dislocations, known to govern the slip in BCC metals and alloys below room temperature. The results show that three different mechanisms take place upon interaction of a screw dislocation with pure Cu precipitates, nanovoids and Cu–vacancy clusters. Pure Cu precipitates are always sheared, while in the reaction with nanovoids local climb, especially at high temperature, is also observed. The interaction mechanisms studied at various temperatures reveal that the penetration of the screw dislocation into Cu–vacancy clusters leads to absorption of the majority of the vacancies on the dislocation line, with the consequent formation of a helical turn. The removal of the helical turn, even a very small one, from the dislocation line requires as high stress as for the passage through a row of nanovoids of comparable size.

KW - PRV steel

KW - hardening

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_125650

UR - http://knowledgecentre.sckcen.be/so2/bibref/9672

U2 - 10.1016/j.jnucmat.2011.11.037

DO - 10.1016/j.jnucmat.2011.11.037

M3 - Article

VL - 421

SP - 32

EP - 38

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

IS - 1-3

ER -

ID: 172481