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Mechanical activation assisted self-propagating high- temperature synthesis of Gamma TiAl-TiC composites

  • : Radu L. Orban1, Dana Salomie1, Magdalena Orban1, Teofil Lung1
  • : 1Technical University of Cluj-Napoca
  • : PDF Download
  • : 2015

Abstract

Gamma TiAl is one of the most promising materials for high temperatures applications. Even if its oxidation resistance limit is moderate (~750 0C), it is attractive as assures a high specific stiffness – higher than of the presently used superalloys. Consequently, is already applied for their substitution, to weight savings, in automotive/aerospace rocket engines at temperatures below this limit. As it can be increased by appropriate coatings, the γ-TiAl applications are expected to be extended to higher temperatures. For this purpose must be also improved its high temperature creep resistance. Even if this is possible by alloying with Mo, Nb, W etc. - all lead to specific stiffness decreasing. More appropriate is particulate reinforcing, among the possible components TiC seeming the most attractive as has density close to of TiAl and can react with it, forming Ti2AlC at the matrix – TiC particles interface, notable improving their embedding. Nowadays these composites are elaborated from TiAl-TiC powder mixtures - leading to a quite coarse microstructure. The possibility to overcome this drawback by the γ-TiAl synthesis and in-situ particulate reinforcing with TiC starting from elemental powder mixtures has been investigated, being established the necessity of its energetically activation before SHS, possible by controlled MA.

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