A novel process for making spherical powders of high Nb containing TiAl alloys

X. Lu, L. P. Zhu, X. H. Qu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

A novel process was developed to make micro-fine spherical high Nb containing TiAl alloyed powders in quantity. Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y(at%) ingot prepared by vacuum induction melting was heat-treated for homogenization, and then machined with a crusher. The chippings were refined by fluidized bed jet milling, and subsequently spheroidized with radio frequency (RF) argon plasma. The effects of processing parameters on powder characteristics were studied. By fluidized bed jet milling, the particle size and distribution uniformity both decline with the rise of classifier frequency. Above 5800rpm, the number-average diameter is lower than 20μm with a bimodal particle size distribution. The powders consist of coarse plate-shaped particles and some finer flaky debris, and with the further rise of the frequency, the amount of debris gradually increases. The plasma-spheroidized powders are found to possess good sphericity and composition homogeneity with phase dominated by supersaturated α2-Ti3Al. The granulometric characteristics of the spherical powders strongly depend on those of the feed powders. For the jet milled powders below 5800rpm, due to the relatively lower size distribution uniformity, the fine particle fraction reduces after spheroidization, which causes an obvious improvement of distribution uniformity and the corresponding increase of number-average diameter.

Original languageEnglish
Title of host publicationPowder Metallurgy of Titanium
Subtitle of host publicationPowder Processing, Consolidation and Metallurgy of Titanium
PublisherTrans Tech Publications Ltd
Pages111-119
Number of pages9
ISBN (Print)9783037854686
DOIs
Publication statusPublished - 2012 Jan 1
Externally publishedYes
Event1st International Conference on Powder Processing, Consolidation and Metallurgy of Titanium - Brisbane, QLD, Australia
Duration: 2011 Dec 42011 Dec 7

Publication series

NameKey Engineering Materials
Volume520
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Other

Other1st International Conference on Powder Processing, Consolidation and Metallurgy of Titanium
CountryAustralia
CityBrisbane, QLD
Period11/12/411/12/7

Keywords

  • Fluidized bed jet milling
  • High Nb containing TiAl alloys
  • Powder characteristics
  • Powder preparation
  • Radio frequency (RF) plasma spheroidization

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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