Effect of sodium hypophosphite on the structure and properties of electrodeposited Ni-W-P alloys

Jamil Ahmad, Katsuhiko Asami, Akira Takeuchi, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Amorphous and nanocrystalline Ni-W-P alloy films have been prepared by electrodeposition. The effect of sodium hypophosphite in the bath is important in determining the W and P contents of the alloy. The alloys prepared in the bath containing more than about 0.15 mol/L of sodium hypophosphite are only Ni-P alloys containing high P contents (>21% (at)) and no W at all. However, as the sodium hypophosphite content is decreased, the W content in the alloy increases and reaches about 20% (at) with decreasing P content to about 1% (at) at 6 × 10-4 mol/L of sodium hypophosphite. The alloys containing high P contents are amorphous, while those containing high W contents have a nanocrystalline phase with apparent grain size of 2.3 nm at 20% (at) W content. These nanocrystalline alloys show high hardness values up to about 780 MVH.

Original languageEnglish
Pages (from-to)705-708
Number of pages4
JournalMaterials Transactions
Volume44
Issue number4
DOIs
Publication statusPublished - 2003 Apr

Keywords

  • Amorphous
  • Electrodeposited
  • Nanocrystalline
  • Nickel-tungsten-phosphorus alloys
  • Sodium hypophosphite

ASJC Scopus subject areas

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

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