Carbide and hydride formation during mechanical alloying of titanium and aluminium with hexane

  • Keskinen J
  • Pogany A
  • Rubin J
 et al. 
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Abstract

Mixtures of elemental titanium and aluminium powders of overall composition TixAl1+x(x = 0.02, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.8) were mechanically alloyed in a planetary-type ball mill. Hexane was added as a process control agent to reduce powder agglomeration during milling. The as-milled powders were characterized using X-ray diffraction, differential scanning calorimetry, scanning electron microscopy and transmission electron microscopy. During milling, the hexane is partially dissociated, with the free carbon and hydrogen incorporated within the TixAl1 - xalloy powders in increasing amounts with increasing milling time. The amount of incorporated carbon increases with the initial Ti content of the powder mixture, reaching a maximum of 12 wt.% incorporated into an initial Ti0.8Al0.2powder mixture after 100 h of milling. The hydrogen is found to combine with elemental Ti to form TiH2-x, with an initial Ti0.5Al0.5powder mixture milled for 40 h incorporating 0.95 wt.% H. The milled (TixAl1 - x+ C) powder mixtures form a large fraction of amorphous phase near x = 0.5. Annealing of the as-milled powders incorporating dissolved carbon and hydrogen produced a mixture of Al2Ti4C2, TiC and TiAl. © 1995.

Author-supplied keywords

  • Alloying
  • Aluminium
  • Carbide
  • Hexane
  • Hydride
  • Titanium

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Authors

  • Jari Keskinen

  • Andrew Pogany

  • Jim Rubin

  • Pekka Ruuskanen

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