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Asperity contacts at the nanoscale: comparison of Ru and Au

Fortini, A, Mendelev, MI, Buldyrev, S and Srolovitz, D (2008) Asperity contacts at the nanoscale: comparison of Ru and Au J. Appl. Phys. 104 (2008) p. 074320.

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Abstract

We develop and validate an interatomic potential for ruthenium based on the embedded atom method framework with the Finnis/Sinclair representation. We confirm that the new potential yields a stable hcp lattice with reasonable lattice and elastic constants and surface and stacking fault energies. We employ molecular dynamics simulations to bring two surfaces together; one flat and the other with a single asperity. We compare the process of asperity contact formation and breaking in Au and Ru, two materials currently in use in micro electro mechanical system switches. While Au is very ductile at 150 and 300 K, Ru shows considerably less plasticity at 300 and 600 K (approximately the same homologous temperature). In Au, the asperity necks down to a single atom thick bridge at separation. While similar necking occurs in Ru at 600 K, it is much more limited than in Au. On the other hand, at 300 K, Ru breaks by a much more brittle process of fracture/decohesion with limited plastic deformation.

Item Type: Article
Authors :
NameEmailORCID
Fortini, Aa.fortini@surrey.ac.ukUNSPECIFIED
Mendelev, MIUNSPECIFIEDUNSPECIFIED
Buldyrev, SUNSPECIFIEDUNSPECIFIED
Srolovitz, DUNSPECIFIEDUNSPECIFIED
Date : 3 July 2008
Identification Number : https://doi.org/10.1063/1.2991301
Uncontrolled Keywords : cond-mat.mtrl-sci, cond-mat.mtrl-sci
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:16
Last Modified : 17 May 2017 15:10
URI: http://epubs.surrey.ac.uk/id/eprint/838599

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