Stability of perfect dislocations in rare-earth intermetallic compounds: YCu, YAg and YZn

被引：34

作者：

Chen, Q ^{[1
]}

Biner, SB ^{[1
]}

机构：

[1] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA

来源：

ACTA MATERIALIA | 2005年 / 53卷 / 11期

基金：

美国能源部;

关键词：

intermetallics; dislocation; line tension; kink-pairs; cross-slip;

D O I：

10.1016/j.actamat.2005.03.026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, we evaluate the stability of prefect dislocations, interaction energy of kink pairs, cross-slip behavior of screw dislocations and the instability of pinned dislocations in ductile rare-earth intermetallic compounds: YCu, YAg and YZn. The results are compared to those seen for the common B2 type intermetallics, NiAl and Fe-25Al. The results indicate that the elastic anisotropy does not cause any instability of ordinary dislocations in YCu, YAg and YZn in contrast to NiAl and Fe-25Al. The cross-slip characteristics and the external driving force required for the instability of pinned dislocations differ considerably, resulting from their lower energy and the absence of negative line tension, from those seen for NiAl and Fe-25Al. The results also elucidate certain differences observed between the single crystalline deformation behavior of YCu, YAg and YZn. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3215 / 3223

页数：9

共 30 条

[1]

BARNETT DM, 1973, PHYS NORV, V7, P13

[2] Intermetallics: new physics [J].

Cahn, RW .

CONTEMPORARY PHYSICS, 2001, 42 (06) :365-375

[3]

Caillard D, 1999, PHILOS MAG A, V79, P723, DOI 10.1080/01418619908210327

[4] DISLOCATION CORE STRUCTURES IN B2-NIAL ALLOYS [J].

CRIMP, MA ;

TONN, SC ;

ZHANG, Y .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1993, 170 (1-2) :95-102

[5] INTERACTION OF DISLOCATIONS WITH AN APPLIED STRESS IN ANISOTROPIC CRYSTALS [J].

DEWIT, G ;

KOEHLER, JS .

PHYSICAL REVIEW, 1959, 116 (05) :1113-1120

[6] A study of dislocation junctions in FCC metals by an orientation dependent line tension model [J].

Dupuy, L ;

Fivel, MC .

ACTA MATERIALIA, 2002, 50 (19) :4873-4885

[7] ANISOTROPIC ELASTICITY WITH APPLICATIONS TO DISLOCATION THEORY [J].

ESHELBY, JD ;

READ, WT ;

SHOCKLEY, W .

ACTA METALLURGICA, 1953, 1 (03) :251-259

[8]

FIELD RD, 1991, ACTA METALL MATER, V39, P2951, DOI 10.1016/0956-7151(91)90027-X

[9] PLASTIC-DEFORMATION OF NIAL SINGLE-CRYSTALS BETWEEN 300 DEGREES 5 AND 1050 DEGREES K .1. EXPERIMENTAL EVIDENCE ON ROLE OF KINKING AND UNIFORM DEFORMATION IN CRYSTALS COMPRESSED ALONG [001] [J].

FRASER, HL ;

SMALLMAN, RE ;

LORETTO, MH .

PHILOSOPHICAL MAGAZINE, 1973, 28 (03) :651-665

[10]

FRIEDEL J, 1964, DISLOCATIONS, P32

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