Fabrication of micro-fine spherical Ti–6Al–4V alloy powders based on hydrogen decrepitation and plasma spheroidisation

C. C. Liu, X. Lu, L. Zhang, W. L. Song, J. B. Tong, S. D. Yang, X. H. Qu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A novel process was developed for scalable fabrication of micro-fine spherical Ti–6Al–4V alloy powders. The hydrogenation-treated Ti–6Al–4V alloy ingot was mechanically crushed into particles and then sieved into three size grades. The powders were separately sent through the radio frequency (RF) argon plasma system for spheroidisation. The fabrication process and powder characteristics were investigated. The results indicate the alloy ingot upon hydrogenation treatment can be efficiently crushed into fine particles with size of 5–76 μm. During RF plasma processing, the powders are found to be greatly refined due to hydrogen decrepitation with subsequent transformation into spherical morphology. The effect of hydrogen decrepitation on particle refinement is impaired with decreasing particle size of feed powders. The spherical powders exhibit a narrow particle size distribution and the average size is in the range of 8.2–27.9 μm. The spheroidised powders mainly consist of β-Ti and TiH1.5.

Original languageEnglish
Pages (from-to)229-235
Number of pages7
JournalPowder Metallurgy
Volume59
Issue number4
DOIs
Publication statusPublished - 2016 Aug 7
Externally publishedYes

Keywords

  • Hydrogen decrepitation
  • Plasma spheroidisation
  • Powder characteristics
  • Powder metallurgy
  • Ti–6Al–4V alloy

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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