Atomistic simulations for the evolution of a U-shaped dislocation in fcc Al

被引：13

作者：

Li, X. Y. ^{[1
]}

Yang, W. ^{[1
]}

机构：

[1] Tsing Hua Univ, Dept Engn Mech, Beijing 100084, Peoples R China

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.74.144108

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Through massively parallel molecular dynamics simulations for the evolution of U-shaped dislocation in face-centered cubic aluminum, conventional and noncoplanar (in a helical form) evolutions of dislocation segments are revealed at the atomistic scale. The two different evolutions are closely related to the Frank-Read multiplication mechanism. The possibility of noncoplanar process is quantitatively analyzed using a combination of continuum dislocation dynamics theory and atomistic simulations. The cross-slip mechanism involving in the noncoplanar evolution is supported by examining its energy barrier and critical stress. It is suggested that the operations of two different evolutions are dictated by the strain rate and the crystal size.

引用

页数：6

共 33 条

[21] Molecular dynamics simulation on burst and arrest of stacking faults in nanocrystalline Cu under nanoindentation [J].

Ma, XL ;

Yang, W .

NANOTECHNOLOGY, 2003, 14 (11) :1208-1215

[22] Interatomic potentials for monoatomic metals from experimental data and ab initio calculations [J].

Mishin, Y ;

Farkas, D ;

Mehl, MJ ;

Papaconstantopoulos, DA .

PHYSICAL REVIEW B, 1999, 59 (05) :3393-3407

[23] Observation of a novel stacking-fault nucleation mechanism in melt-textured YBa2Cu3O7 [J].

Rabier, J ;

Sandiumenge, F ;

Plain, J ;

Proult, A ;

Stretton, I .

PHILOSOPHICAL MAGAZINE LETTERS, 2002, 82 (08) :419-423

[24] Atomistic determination of cross-slip pathway and energetics [J].

Rasmussen, T ;

Jacobsen, KW ;

Leffers, T ;

Pedersen, OB ;

Srinivasan, SG ;

Jonsson, H .

PHYSICAL REVIEW LETTERS, 1997, 79 (19) :3676-3679

[25] Simulations of the atomic structure, energetics, and cross slip of screw dislocations in copper [J].

Rasmussen, T ;

Jacobsen, KW ;

Leffers, T ;

Pedersen, OB .

PHYSICAL REVIEW B, 1997, 56 (06) :2977-2990

[26] Atomic-scale simulations of the mechanical deformation of nanocrystalline metals [J].

Schiotz, J ;

Vegge, T ;

Di Tolla, FD ;

Jacobsen, KW .

PHYSICAL REVIEW B, 1999, 60 (17) :11971-11983

[27]

SCHOECK G, 1955, DEFECTS CRYSTALLINE, P340

[28] Defect generation and pileup of atoms during nanoindentation of Fe single crystals [J].

Smith, R ;

Christopher, D ;

Kenny, SD ;

Richter, A ;

Wolf, B .

PHYSICAL REVIEW B, 2003, 67 (24)

[29] REVERSIBLE MULTIPLE TIME SCALE MOLECULAR-DYNAMICS [J].

TUCKERMAN, M ;

BERNE, BJ ;

MARTYNA, GJ .

JOURNAL OF CHEMICAL PHYSICS, 1992, 97 (03) :1990-2001

[30] Grain-boundary structures in polycrystalline metals at the nanoscale [J].

Van Swygenhoven, H ;

Farkas, D ;

Caro, A .

PHYSICAL REVIEW B, 2000, 62 (02) :831-838

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