Synthesis, processing and properties of nanophase aluminide

Hyuk Chang, Jurgen Hofler, Carl Altstetter, Robert Averback

Research output: Contribution to journalConference article

Abstract

This paper presents recent results on the production and properties of compacts of ultrafine powders of γ-TiAl, Metallic vapor was produced by magnetron sputtering of a TiAl target and inert gas-mediated condensation of nanometer sized particles. After collection, the particles were compacted in situ under ultrahigh vacuum conditions. The material was characterized by X-ray diffraction and hardness as a function of sintering time and temperature. Greater than 95% density was achieved in the compacts after sintering for 2 h at 450°C at which time the average grain size was still less than 20 nm. Hardness was measured as a function of grain size, and normal Hall-Petch behavior was observed, but only at grain sizes above approximately 30 nm, at which point a hardness of 12 GPa was measured. At finer particle sizes the hardness decreased with decreasing grain size.

Original languageEnglish (US)
Pages (from-to)676-678
Number of pages3
JournalMaterials Science and Engineering A
VolumeA153
Issue number1 -2 pt 2
StatePublished - Jan 1 1992
EventProceedings of the 2nd International ASM Conference on High Temperature Aluminides and Intermetallics - San Diego, CA, USA
Duration: Sep 16 1991Sep 19 1991

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ASJC Scopus subject areas

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

Cite this

Chang, H., Hofler, J., Altstetter, C., & Averback, R. (1992). Synthesis, processing and properties of nanophase aluminide. Materials Science and Engineering A, A153(1 -2 pt 2), 676-678.