Mechanical alloying of the Ti-Al system in a hydrogen gas atmosphere and their subsequent consolidation

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Three kinds of Ti-Al powders, Ti72Al28, Ti57Al43 and Ti48Al52, mechanically alloyed by a planetary ball mill in a hydrogen gas atmosphere (0.1 MPa) for alloying time of 30 h were consolidated by cold isostatic pressing and sintering in a vacuum. The densities and Vickers hardness of the consolidated samples were measured and then were compared with those obtained from powders mechanically alloyed in an argon gas atmosphere as well as those without mechanical alloying (MA). The hydrogen atmosphere enhanced the solid-solid reaction accompanying with the assistance of dynamical process of MA and accelerated the formation of amorphous phase or the refinement of the powders without forming a hydride phase after a longer MA process. The microstructures of the consolidated samples after MA were not dependent on gas atmosphere and could be estimated from the Ti-Al binary phase diagram. Higher density as well as higher Vickers hardness could be expected in the consolidated samples obtained after MA in hydrogen gas atmosphere.

元の言語English
ページ(範囲)1085-1089
ページ数5
ジャーナルFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
46
発行部数10
DOI
出版物ステータスPublished - 1999 10

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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