Dissociated dislocations in confined plasticity

被引：24

作者：

Douin, J. ^{[1
]}

Pettinari-Sturmel, F. ^{[1
]}

Coujou, A. ^{[1
]}

机构：

[1] CNRS, CEMES, F-31055 Toulouse, France

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 19期

关键词：

confined plasticity; dislocations; dissociation; dislocation dynamics; superalloys;

D O I：

10.1016/j.actamat.2007.08.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of the dissociation of dislocations when plasticity is localized in small volumes is illustrated for the case of gamma/gamma ' superalloys. Dissociated dislocations constrained to move through channels present three different types of behavior. Dislocation dynamic simulations in a face-centered cubic crystal show these three types of behavior and give the conditions under which a dissociated dislocation can move through a channel bordered by impenetrable obstacles. We show that a partial dislocation needs a lower stress for its motion than a perfect one in a significant domain of stress orientations. The consequences of the uncorrelated motion of one of the partials, leading to the formation of large stacking faults, are also examined. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：6453 / 6458

页数：6

共 42 条

[21] Nucleation and growth of deformation twins:: a perspective based on the double-cross-slip mechanism of deformation twinning [J].

Lagerlöf, KPD ;

Castaing, J ;

Pirouz, P ;

Heuer, AH .

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 2002, 82 (15) :2841-2854

[22]

Locq D, 2004, SUPERALLOYS 2004, P179, DOI 10.7449/2004/Superalloys_2004_179_187

[23] Computer simulations of the glide of dissociated dislocations in lattice mismatch strengthened materials [J].

Mohles, V .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 324 (1-2) :190-195

[24] The peak- and overaged states of particle strengthened materials: Computer simulations [J].

Mohles, V ;

Nembach, E .

ACTA MATERIALIA, 2001, 49 (13) :2405-2417

[25] Constrained glide and interaction of bowed-out screw dislocations in confined channels [J].

Mughrabi, H ;

Pschenitzka, F .

PHILOSOPHICAL MAGAZINE, 2005, 85 (26-27) :3029-3045

[26] Yielding and strain hardening of thin metal films on substrates [J].

Nix, WD .

SCRIPTA MATERIALIA, 1998, 39 (4-5) :545-554

[27] In situ TEM straining of single crystal Au films on polyimide: Change of deformation mechanisms at the nanoscale [J].

Oh, S. H. ;

Legros, M. ;

Kiener, D. ;

Gruber, P. ;

Dehm, G. .

ACTA MATERIALIA, 2007, 55 (16) :5558-5571

[28] Dislocation interactions in thin FCC metal films [J].

Pant, P ;

Schwarz, KW ;

Baker, SP .

ACTA MATERIALIA, 2003, 51 (11) :3243-3258

[29] THE FORCES EXERTED ON DISLOCATIONS AND THE STRESS FIELDS PRODUCED BY THEM [J].

PEACH, M ;

KOEHLER, JS .

PHYSICAL REVIEW, 1950, 80 (03) :436-439

[30] Stacking fault energy in short-range ordered γ-phases of Ni-based superalloys [J].

Pettinari, F ;

Douin, J ;

Saada, G ;

Caron, P ;

Coujou, A ;

Clément, N .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2002, 325 (1-2) :511-519

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