Al/Al-Si nano-composite graded coating prepared by supersonic free-jet PVD

Atsushi Yumoto, Takahisa Yamamoto, Fujio Hiroki, Ichiro Shiota, Naotake Niwa

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Increase of Si content increases wear resistant properties of hypereutectic Al-Si alloys. However, large primary Si phase is inevitable in Al-Si alloy when the alloy is produced by conventional casting processes, which deteriorate its machinability as well as its mechanical properties. The objective of this study is to produce graded Al/Al-Si nanocomposite coating onto an A1050 Al alloy substrate by mixing Al and Si nanoparticles with Supersonic Free-Jet PVD (SFJ-PVD). The SFJ-PVD has been developed as a new coating method in which a coating film is formed by depositing nanoparticles with very high velocity onto a substrate. This SFJ-PVD provides a high deposition rate and produces a mixture of different kinds of nanoparticles formed in different evaporation chambers on the substrate. The graded Al/Al-Si coating film is produced by depositing Al and Si nanoparticles formed in different evaporation chambers with the controlled evaporation rates of Al and Si respectively. A smooth, compact and defect-free microstructure is formed both at the interface between the substrate and the coating film and inside the coating film. The graded Al-Si coating film has very fine, varying from 10 to 20 nm in diameter, Si phases in Al matrix. It is confirmed with nano-indentation hardness tester that the graded Al/Al-Si coating film on A1050 substrate has graded hardness from 0.65 to 5.9 GPa corresponding to the gradual compositional change of Si up to Al-57.8 at%Si.

Original languageEnglish
Pages (from-to)2740-2743
Number of pages4
JournalMaterials Transactions
Volume45
Issue number8
Publication statusPublished - 2004 Aug
Externally publishedYes

Fingerprint

free jets
Physical vapor deposition
coatings
Coatings
composite materials
Composite materials
nanoparticles
Nanoparticles
Substrates
Evaporation
hardness
chambers
evaporation
Hardness
evaporation rate
Machinability
nanoindentation
test equipment
Nanoindentation
Deposition rates

Keywords

  • Aluminum-silicon alloy
  • Functionally graded material
  • Microstructure
  • Nano-indentation hardness test
  • Nanoparticle
  • Supersonic gas flow

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

Yumoto, A., Yamamoto, T., Hiroki, F., Shiota, I., & Niwa, N. (2004). Al/Al-Si nano-composite graded coating prepared by supersonic free-jet PVD. Materials Transactions, 45(8), 2740-2743.

Al/Al-Si nano-composite graded coating prepared by supersonic free-jet PVD. / Yumoto, Atsushi; Yamamoto, Takahisa; Hiroki, Fujio; Shiota, Ichiro; Niwa, Naotake.

In: Materials Transactions, Vol. 45, No. 8, 08.2004, p. 2740-2743.

Research output: Contribution to journalArticle

Yumoto, A, Yamamoto, T, Hiroki, F, Shiota, I & Niwa, N 2004, 'Al/Al-Si nano-composite graded coating prepared by supersonic free-jet PVD', Materials Transactions, vol. 45, no. 8, pp. 2740-2743.
Yumoto A, Yamamoto T, Hiroki F, Shiota I, Niwa N. Al/Al-Si nano-composite graded coating prepared by supersonic free-jet PVD. Materials Transactions. 2004 Aug;45(8):2740-2743.
Yumoto, Atsushi ; Yamamoto, Takahisa ; Hiroki, Fujio ; Shiota, Ichiro ; Niwa, Naotake. / Al/Al-Si nano-composite graded coating prepared by supersonic free-jet PVD. In: Materials Transactions. 2004 ; Vol. 45, No. 8. pp. 2740-2743.
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