Evaluation of the hardness and Young's modulus of electrodeposited Al–W alloy films by nano-indentation

Shota Higashino, Masao Miyake, Ayumu Takahashi, Yuya Matamura, Hisashi Fujii, Ryuta Kasada, Tetsuji Hirato

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Al–W alloy films with various W contents up to ~ 12 at.% were prepared by electrodeposition using 1-ethyl-3-methylimidazolium chloride (EMIC)–AlCl3 ionic liquids with different concentrations of W precursor, W6Cl12. The hardness (H) and Young's modulus (E) of the films were examined by nano-indentation. The films were composed of a single-phase fcc Al super-saturated solid solution, an amorphous phase, or both, depending on the W content and the deposition conditions. The H value increased with increasing W content up to 9.8 at.% and then decreased slightly with further increases in the W content up to 12.4 at.%. A similar trend was observed in the E value with increasing W content, but the decrease in E value at 12.4 at.% W was more significant than that in H value. The changes in the H and E values are discussed from the viewpoints of the grain size and the constituent phases. The 9.8–12.4 at.% W films, which had relatively high H values and H/E ratios, are expected to have a higher resistance to mechanical damage than Al films.

Original languageEnglish
Pages (from-to)346-351
Number of pages6
JournalSurface and Coatings Technology
Volume325
DOIs
Publication statusPublished - 2017 Sep 25
Externally publishedYes

Keywords

  • Aluminum
  • Amorphous alloy
  • Electroplating
  • Ionic liquid
  • Nano-indentation
  • Tungsten

ASJC Scopus subject areas

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

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