On the role of initial void geometry in plastic deformation of metallic thin films: A molecular dynamics study

ABSTRACTWidely accepted model of bending of a single crystal suggests that edge dislocations are introduced from both the compressed surface and extended surface. The present study examined this model by molecular dynamics using an embedded potential. Shockley partial dislocations are created on the compressed surface. Due to the characteristics of inter atomic potential, the stress on the compression surface is higher than that on the extended surface.

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Role of conductivity on the electromigration-induced morphological evolution of inclusions in {110}-oriented single crystal metallic thin films

Journal of Applied Physics ◽

10.1063/1.5119714 ◽

2019 ◽

Vol 126 (16) ◽

pp. 165305 ◽

Cited By ~ 1

Author(s):

Jay Santoki ◽

Arnab Mukherjee ◽

Daniel Schneider ◽

Britta Nestler

Keyword(s):

Thin Films ◽

Single Crystal ◽

Morphological Evolution ◽

Metallic Thin Films ◽

Oriented Single Crystal

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Computer Simulation of Bending Plastic Deformation and Creation of Dislocations in Copper Thin Films

MRS Proceedings ◽

10.1557/proc-367-119 ◽

1994 ◽

Vol 367 ◽

Author(s):

H. Tsukahara ◽

Y. Niwa ◽

T. Takayama ◽

Masao Doyama

Keyword(s):

Thin Films ◽

Molecular Dynamics ◽

Computer Simulation ◽

Plastic Deformation ◽

Single Crystal ◽

Slip Plane ◽

Molecular Dynamics Method ◽

Copper Single Crystal ◽

Small Single Crystal ◽

Dynamics Method

AbstractA small single crystal of copper with a notch has been bent by use of the molecular dynamics method. The bend axis was [110]. Dislocations were created near the tip of the notch and moved on (111) slip plane. Pulling a copper single crystal, half dislocations were created in such a way that the bending was compensated.

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Expanded Thermochromic Color Changes in VO2 Thin Film Devices Using Structured Plasmonic Metal Layers

MRS Proceedings ◽

10.1557/opl.2013.158 ◽

2013 ◽

Vol 1494 ◽

pp. 171-177

Author(s):

Yan Wang ◽

John F. Muth

Keyword(s):

Thin Films ◽

Near Infrared ◽

Color Change ◽

Large Change ◽

Metallic Phase ◽

Metallic Thin Films ◽

Color Changes ◽

Surface Plasmas ◽

Metal Layers

ABSTRACTWe investigate metallic thin films on VO2 and show that the magnitude of the reflected color change in that visible portion of the spectrum as VO2 undergoes the insulating to metallic phase transition can be controlled by changing the type of metal, the thickness of the metal and by patterning the metal at the nano scale. We consider the role of surface plasmas in the metal film and show that in the near infrared, the magnitude of the reflectivity increase for metal coated VO2 films, but decrease for uncoated VO2 thin films. This is explained in the context of Fresnel equations and considering the large change in the imaginary part of the dielectric constant as the VO2 changes state from the insulating to metallic phase.

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Role of Film-Substrate Interaction in Determining the Morphology of Thin Films

MRS Proceedings ◽

10.1557/proc-103-13 ◽

1987 ◽

Vol 103 ◽

Cited By ~ 4

Author(s):

Marcia H. Grabow ◽

George H. Gilmer

Keyword(s):

Thin Films ◽

Molecular Dynamics ◽

Computer Simulations ◽

Substrate Binding ◽

Equilibrium Structure ◽

Metastable States ◽

Growth Mode ◽

Substrate Interaction ◽

Film Substrate

ABSTRACTThe equilibrium structure and metastable states of thin films have been investigated using molecular dynamics computer simulations. The energy as a function of coverage for a variety of film/substrate systems has been determined, and this information has been used to determine the growth mode and the conditions under which the film is dislocation free. In particular, the influence of the strength of the film-substrate binding will be discussed.

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ATOMISTIC MODELING OF THE EFFECT OF TWINS ON PLASTIC DEFORMATION IN NANOCRYSTALLINE COBALT

International Journal of Nanoscience ◽

10.1142/s0219581x05003735 ◽

2005 ◽

Vol 04 (04) ◽

pp. 651-658

Author(s):

G. P. ZHENG

Keyword(s):

Molecular Dynamics ◽

Plastic Deformation ◽

Molecular Dynamics Simulation ◽

Tensile Deformation ◽

Dynamics Simulation ◽

Atomistic Modeling ◽

Allotropic Transformation ◽

Hexagonal Close Packed ◽

Deformation Processes

It has been observed by experiments and computer simulations that deformation twinning and grown-in twins play important roles during the plastic deformation in nanocrystalline (nc) metals. In this study, molecular dynamics simulation is employed to investigate the role of grown-in twins in the tensile deformation of hexagonal close-packed nc cobalt. Plastic deformation processes in three types of nc samples, namely nc-cobalt without twins, with (0002) twin faults and with (1121) twins, are compared. The results show that the pre-existing twins significantly lower the mechanical strength and do not enhance the ductility of nc cobalt. Instead deformation induced hcp-to-fcc allotropic transformation is found to result in remarkable strain hardening in the modeled nc cobalt.

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