Dislocation-interface interaction in nanoscale fcc metallic bilayers

被引：42

作者：

Shao, Shuai ^{[1
]}

Medyanik, Sergey N. ^{[1
]}

机构：

[1] Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA

来源：

MECHANICS RESEARCH COMMUNICATIONS | 2010年 / 37卷 / 03期

关键词：

Nanomaterials; Metallic composites; Interfaces; Dislocations; Atomistic simulation; Nanoindentation; EMBEDDED-ATOM METHOD; BICRYSTAL INTERFACES; DEFORMATION; MULTILAYERS; COMPOSITES; NUCLEATION; NANOINDENTATION; SIMULATIONS; MECHANISMS; STABILITY;

D O I：

10.1016/j.mechrescom.2010.03.007

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Dislocation-interface interactions are investigated in a Ni-Cu bilayer using molecular mechanics simulations. Nanoindentation model is used to generate dislocations in the top Ni layer and study their propagation through coherent (1 1 1) fcc interface into Cu. Although dislocations do propagate through, the interface acts as a strong barrier to gliding dislocations and contributes considerably to the overall strain hardening of the nanolayered material. Mechanisms of dislocation-interface interactions are analyzed. In particular, spreading of a dissociated dislocation core at the interface and interfacial stacking fault formation are investigated along with their effect on the material strengthening. Published by Elsevier Ltd.

引用

页码：315 / 319

页数：5

共 22 条

[1]

[Anonymous], 1992, THEORY DISLOCATIONS

[2] Dislocation nucleation from bicrystal interfaces and grain boundary ledges: Relationship to nanocrystalline deformation [J].

Capolungo, L. ;

Spearot, D. E. ;

Cherkaoui, M. ;

McDowell, D. L. ;

Qu, J. ;

Jacob, K. I. .

JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 2007, 55 (11) :2300-2327

[3] EMBEDDED-ATOM METHOD - DERIVATION AND APPLICATION TO IMPURITIES, SURFACES, AND OTHER DEFECTS IN METALS [J].

DAW, MS ;

BASKES, MI .

PHYSICAL REVIEW B, 1984, 29 (12) :6443-6453

[4] THE EMBEDDED-ATOM METHOD - A REVIEW OF THEORY AND APPLICATIONS [J].

DAW, MS ;

FOILES, SM ;

BASKES, MI .

MATERIALS SCIENCE REPORTS, 1993, 9 (7-8) :251-310

[5]

Dieter G.E., 1986, MECH METALLURGY

[6] CRITICAL LAYER THICKNESS FOR MISFIT DISLOCATION STABILITY IN MULTILAYER STRUCTURES [J].

HIRTH, JP ;

FENG, XX .

JOURNAL OF APPLIED PHYSICS, 1990, 67 (07) :3343-3349

[7] On the role of weak interfaces in blocking slip in nanoscale layered composites [J].

Hoagland, R. G. ;

Hirth, J. P. ;

Misra, A. .

PHILOSOPHICAL MAGAZINE, 2006, 86 (23) :3537-3558

[8] On the strengthening effects of interfaces in multilayer fcc metallic composites [J].

Hoagland, RG ;

Mitchell, TE ;

Hirth, JP ;

Kung, H .

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 2002, 82 (04) :643-664

[9] Dislocation nucleation and defect structure during surface indentation [J].

Kelchner, CL ;

Plimpton, SJ ;

Hamilton, JC .

PHYSICAL REVIEW B, 1998, 58 (17) :11085-11088

[10] Strengthening effects of coherent interfaces in nanoscale metallic bilayers [J].

Medyanik, Sergey N. ;

Shao, Shuai .

COMPUTATIONAL MATERIALS SCIENCE, 2009, 45 (04) :1129-1133

← 1 2 3 →