Structure and mechanical properties of Fe1-xMnx/TiB2 multilayer coatings: Possible role of transformation toughening

Chen Wang*, Jie Han, Julio Miranda Pureza, Yip Wah Chung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The objective of this research is to characterize the elastic modulus, hardness, fracture toughness, and structure of multilayer coatings consisting of alternating nanolayers of Fe1-xMnx and TiB2 coatings (x=0, 0.18, and 0.35). These coatings were synthesized by dc magnetron sputtering. X-ray diffraction showed that Fe0.82Mn0.18 contains 79% bcc and 21% fcc phases, while Fe0.65Mn0.35 contains close to 100% fcc phase. The hardness of these multilayer coatings was found to exhibit a small enhancement (~2GPa) over the rule-of-mixture values. The most striking finding is that the fracture toughness of Fe0.82Mn0.18/TiB2 is about twice of that for Fe0.65Mn0.35/TiB2 and Fe/TiB2 with comparable hardness. In addition, Fe0.82Mn0.18/TiB2 exhibits a quasi-elastic response in nanoindentation experiments. Given that Mn addition to Fe is known to result in the formation of metastable fcc phases at room temperature (with the degree of metastability controlled by the Mn content) and that the fcc phase may transform to the bcc phase under stress, such a transformation is likely to play a role in the increased toughness and quasi-elastic nanoindentation response observed in these coatings and may provide a strategy in the synthesis of hard coatings with improved toughness.

Original languageEnglish (US)
Pages (from-to)158-163
Number of pages6
JournalSurface and Coatings Technology
Volume237
DOIs
StatePublished - Dec 25 2013

Keywords

  • Fracture toughness
  • Hardness
  • Magnetron sputtering
  • Multilayers
  • Nanoindentation

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Structure and mechanical properties of Fe<sub>1-x</sub>Mn<sub>x</sub>/TiB<sub>2</sub> multilayer coatings: Possible role of transformation toughening'. Together they form a unique fingerprint.

Cite this