Age-hardening in a two component immiscible nanolaminate metal system

Chang Eun Kim, Raheleh M. Rahimi, Tyler L. Maxwell, T. John Balk, David F. Bahr

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Density functional theory was used to predict the diffusion and precipitation of Cr in Cu. The energy barrier of Cr diffusion in Cu is comparable to the self-diffusion of Cr, and higher than the energy barrier of Cu self-diffusion. The simulations support the experimentally measured hardness of 30 nm thick nanolaminate layers of Cr/Cu-3.4%Cr. As-deposited films had a hardness of 6.25 GPa; annealing at 373 K decreased hardness to 5.95 GPa, while annealing at 573 K increased the hardness to 6.6 GPa. Transmission electron microscopy indicates there is significant local strain due to precipitation, in agreement with theoretical predictions.

Original languageEnglish
Pages (from-to)33-36
Number of pages4
JournalScripta Materialia
Volume136
DOIs
StatePublished - Jul 15 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Ltd

Keywords

  • Density functional theory (DFT)
  • Multilayers
  • Nanoindentation
  • Precipitation
  • Sputtering

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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