Softening under membrane contact stress due to ultra-thin Ru coatings on Au films

A. L. Romasco-Tremper, Suzanne E. Mohney, K. L. Andre, J. C. Lin, C. L. Muhlstein

Research output: Contribution to journalArticle

Abstract

This study reveals that ultra-thin, single-layer metal coatings can be used to tailor the deformation resistance of metal thin film surfaces, even when the penetration depths of the indents extend well beyond the coating layer. Nanoindentation of ultra-thin (≤20. nm) Ru and Pt coatings on thick Au films (350. nm) was used to illustrate how ultra-thin layers affect both the elastic and plastic deformation behavior. In spite of their (generally) higher hardness compared to Au, the Ru and Pt coating systems reduced the deformation resistance of the underlying Au, even though the maximum depth was on the order of the coating thickness. The effects of coating thickness, mechanical properties, and residual stress on the transitions between membrane- and substrate-dominated behavior were established by controlling the deposition conditions of the layers. The results show that the transition from ultra-thin coating- to underlying film-dominated response occurs when the indent penetration depth to coating thickness ratio is less than ~0.5.

Original languageEnglish (US)
Pages (from-to)172-179
Number of pages8
JournalMaterials Science and Engineering A
Volume565
DOIs
StatePublished - Mar 10 2013

Fingerprint

softening
membranes
Membranes
coatings
Coatings
penetration
metal coatings
thickness ratio
elastic deformation
Metal coatings
nanoindentation
Elastic deformation
plastic deformation
Nanoindentation
thick films
residual stress
coating
Thick films
hardness
Residual stresses

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Romasco-Tremper, A. L. ; Mohney, Suzanne E. ; Andre, K. L. ; Lin, J. C. ; Muhlstein, C. L. / Softening under membrane contact stress due to ultra-thin Ru coatings on Au films. In: Materials Science and Engineering A. 2013 ; Vol. 565. pp. 172-179.
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Softening under membrane contact stress due to ultra-thin Ru coatings on Au films. / Romasco-Tremper, A. L.; Mohney, Suzanne E.; Andre, K. L.; Lin, J. C.; Muhlstein, C. L.

In: Materials Science and Engineering A, Vol. 565, 10.03.2013, p. 172-179.

Research output: Contribution to journalArticle

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T1 - Softening under membrane contact stress due to ultra-thin Ru coatings on Au films

AU - Romasco-Tremper, A. L.

AU - Mohney, Suzanne E.

AU - Andre, K. L.

AU - Lin, J. C.

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