Characteristics of high Nb containing TiAl alloyed powders by radio frequency plasma processing

Xin Lu, Shu Chao Wang, Lang Ping Zhu, Xin Bo He, Jun Jie Hao, Xuan Hui Qu

Research output: Contribution to journalArticlepeer-review

Abstract

Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (at%) ingot was prepared using a vacuum induction furnace, and then machined with a crusher in argon atmosphere. Subsequently, microfine spherical high Nb containing TiAl alloyed powders were obtained by fluidized bed jet milling in inert gas and then by radio frequency argon plasma. The fabrication process and characteristics of the powders were investigated. The results show that the powders fabricated by this process is highly refined and spheroidized, and the particle size is accurately controlled in a small interval. The plasma-spheroidized powders are dominated by α2-Ti3Al with a minor amount of β-Ti2AlNb. The oxygen content becomes higher gradually with the decrease of the particle size. The exterior and interior microstructures of the alloyed powders strongly depend on the particle size. The powders with an average particle size of 90μm show dendritic microstructure, and network Al-rich phase segregation exists within the particles. With the particle size decreasing, the surface of the powders tends to be smooth, and the internal segregation is gradually weakened. In addition, the 90μm powders possess high composition homogeneity, and with the decrease of the particle size the composition homogeneity declines gradually.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalHangkong Cailiao Xuebao/Journal of Aeronautical Materials
Volume31
Issue number4
DOIs
Publication statusPublished - 2011 Aug
Externally publishedYes

Keywords

  • High Nb containing TiAl alloy
  • Powder characteristics
  • Radio frequency plasma
  • Spherical powder

ASJC Scopus subject areas

  • Ceramics and Composites
  • Aerospace Engineering
  • Metals and Alloys
  • Materials Chemistry

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