In situ TEM observations of room temperature dislocation climb at interfaces in nanolayered Al/Nb composites

被引：85

作者：

Li, Nan ^{[1
,2
]}

Wang, J. ^{[1
]}

Huang, J. Y. ^{[3
]}

Misra, A. ^{[1
]}

Zhang, X. ^{[2
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[2] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA

[3] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA

来源：

SCRIPTA MATERIALIA | 2010年 / 63卷 / 04期

关键词：

in situ TEM; Dislocations; Multi layers; Climb; NANOCRYSTALLINE ALUMINUM; ATOMISTIC SIMULATIONS; FORMATION MECHANISM; GRAIN-BOUNDARY; DEFORMATION; SCALE; AL; NANOINDENTATION; DYNAMICS; NUCLEATION;

D O I：

10.1016/j.scriptamat.2010.04.005

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Using in situ nanoindentation, we investigated dislocation interface interactions in Al/Nb multilayers. Preferential storage of dislocations at interfaces, as opposed to within layers, was observed. Recovery of dislocations was observed to occur through climb in the interfaces. The rapid climb of dislocations is ascribed to high vacancy diffusivity and vacancy concentration in the interfaces. The vacancy formation energy at interfaces, 0.12 eV, as estimated from the experimentally measured climb rates, was found to be significantly lower than in the bulk. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

引用

页码：363 / 366

页数：4

共 36 条

[1] MECHANISMS OF DISLOCATION CLIMB [J].

BALLUFFI, RW .

PHYSICA STATUS SOLIDI, 1969, 31 (02) :443-&

[2] An atomistic dislocation mechanism of pressure-dependent plastic flow in aluminum [J].

Bulatov, VV ;

Richmond, O ;

Glazov, MV .

ACTA MATERIALIA, 1999, 47 (12) :3507-3514

[3] INSITU CREEP EXPERIMENTS IN WEAK BEAM CONDITIONS, IN AL AT INTERMEDIATE TEMPERATURE - INTERACTION OF DISLOCATIONS WITH SUBBOUNDARIES [J].

CAILLARD, D .

ACTA METALLURGICA, 1984, 32 (09) :1483-1491

[4] Deformation twinning in nanocrystalline aluminum [J].

Chen, MW ;

Ma, E ;

Hemker, KJ ;

Sheng, HW ;

Wang, YM ;

Cheng, XM .

SCIENCE, 2003, 300 (5623) :1275-1277

[5] Interface structure and radiation damage resistance in Cu-Nb multilayer nanocomposites [J].

Demkowicz, M. J. ;

Hoagland, R. G. ;

Hirth, J. P. .

PHYSICAL REVIEW LETTERS, 2008, 100 (13)

[6]

DEMKOWIEZ MJ, 2008, DISLOCATIONS SOLIDS, V14

[7] Atomistic Simulations of Dislocations in Confined Volumes [J].

Derlet, P. M. ;

Gumbsch, P. ;

Hoagland, R. ;

Li, J. ;

McDowell, D. L. ;

Van Swygenhoven, H. ;

Wang, J. .

MRS BULLETIN, 2009, 34 (03) :184-189

[8] Mechanical properties of sputtered Cu/V and Al/Nb multilayer films [J].

Fu, E. G. ;

Li, Nan ;

Misra, A. ;

Hoagland, R. G. ;

Wang, H. ;

Zhang, X. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 493 (1-2) :283-287

[9] Indentation across size scales and disciplines: Recent developments in experimentation and modeling [J].

Gouldstone, Andrew ;

Chollacoop, Nuwong ;

Dao, Ming ;

Li, Ju ;

Minor, Andrew M. ;

Shen, Yu-Lin .

ACTA MATERIALIA, 2007, 55 (12) :4015-4039

[10]

Hirth J.P., 1982, Theory of Dislocations

← 1 2 3 4 →