Computer simulations of nanoindentation in Mg-Cu and Cu-Zr metallic glasses

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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@article{70e9e39d31a44d9db2b6f7e05ceaf44a,
title = "Computer simulations of nanoindentation in Mg-Cu and Cu-Zr metallic glasses",
publisher = "Institute of Physics Publishing",
author = "Anca Paduraru and Andersen, {Ulrik Grønbjerg} and Anders Thyssen and Nicholas Bailey and Jacobsen, {Karsten Wedel} and Jakob Schiøtz",
year = "2010",
doi = "10.1088/0965-0393/18/5/055006",
volume = "18",
number = "5",
pages = "055006",
journal = "Modelling and Simulation in Materials Science and Engineering",
issn = "0965-0393",

}

RIS

TY - JOUR

T1 - Computer simulations of nanoindentation in Mg-Cu and Cu-Zr metallic glasses

A1 - Paduraru,Anca

A1 - Andersen,Ulrik Grønbjerg

A1 - Thyssen,Anders

A1 - Bailey,Nicholas

A1 - Jacobsen,Karsten Wedel

A1 - Schiøtz,Jakob

AU - Paduraru,Anca

AU - Andersen,Ulrik Grønbjerg

AU - Thyssen,Anders

AU - Bailey,Nicholas

AU - Jacobsen,Karsten Wedel

AU - Schiøtz,Jakob

PB - Institute of Physics Publishing

PY - 2010

Y1 - 2010

N2 - The formation of shear bands during plastic deformation of Cu0.50Zr0.50 and Mg0.85Cu0.15 metallic glasses is studied using atomic-scale computer simulations. The atomic interactions are described using realistic many-body potentials within the effective medium theory, and are compared with similar simulations using a Lennard-Jones description of the material. The metallic glasses are deformed both in simple shear and in a simulated nanoindentation experiment. Plastic shear localizes into shear bands with a width of approximately 5 nm in CuZr and 8 nm in MgCu. In simple shear, the shear band formation is very clear, whereas only incipient shear bands are seen in nanoindentation. The shear band formation during nanoindentation is sensitive to the indentation velocity, indenter radius and the cooling rate during the formation of the metallic glass. For comparison, a similar nanoindentation simulation was made with a nanocrystalline sample, showing how the presence of a polycrystalline structure leads to a different and more spatially distributed deformation pattern, where dislocation avalanches play an important role.

AB - The formation of shear bands during plastic deformation of Cu0.50Zr0.50 and Mg0.85Cu0.15 metallic glasses is studied using atomic-scale computer simulations. The atomic interactions are described using realistic many-body potentials within the effective medium theory, and are compared with similar simulations using a Lennard-Jones description of the material. The metallic glasses are deformed both in simple shear and in a simulated nanoindentation experiment. Plastic shear localizes into shear bands with a width of approximately 5 nm in CuZr and 8 nm in MgCu. In simple shear, the shear band formation is very clear, whereas only incipient shear bands are seen in nanoindentation. The shear band formation during nanoindentation is sensitive to the indentation velocity, indenter radius and the cooling rate during the formation of the metallic glass. For comparison, a similar nanoindentation simulation was made with a nanocrystalline sample, showing how the presence of a polycrystalline structure leads to a different and more spatially distributed deformation pattern, where dislocation avalanches play an important role.

U2 - 10.1088/0965-0393/18/5/055006

DO - 10.1088/0965-0393/18/5/055006

JO - Modelling and Simulation in Materials Science and Engineering

JF - Modelling and Simulation in Materials Science and Engineering

SN - 0965-0393

IS - 5

VL - 18

SP - 055006

ER -