Morphological and mechanical stability of HCP-based multilayer nanofilms at elevated temperatures

Y. Y. Lu, R. Kotoka, J. P. Ligda, S. N. Yarmolenko, B. E. Schuster, Q. Wei

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The thermal stability of Mg/Ti multilayer nanofilms was investigated by examining their microstructure and nanoindentation hardness after annealing at various temperatures and time periods. The multilayers with individual layer thickness h≥. 5. nm exhibit excellent capability of maintaining the lamellar microstructure and high strength up to 200. °C for annealing time up to 2.0. h. The annealed multilayer films with h=. 2.5. nm are still highly textured but characterized with discontinuous layer interfaces, in which the transition of atomic arrangement from hexagonal close-packed (HCP) to body-centered cubic (BCC) structure was observed at columnar boundaries. The degradation of uniform lamellar microstructure is related to the decrease of hardness with annealing temperature at this size scale. A diffusion based instability mechanism was proposed for this typical HCP-based nanoscale multilayer system.

Original languageEnglish
Pages (from-to)142-147
Number of pages6
JournalSurface and Coatings Technology
Volume275
DOIs
Publication statusPublished - 2015 Aug 15
Externally publishedYes

Keywords

  • Metallic multilayer
  • Microstructure
  • Nanoindentation hardness
  • Thermal stability

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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