Improvement in oxidation resistance of TiAl alloys by in-situ precipitation of Ti2AlC at the interface of α2 and γ lamellae

Yupeng Wang, Chengze Liu, Tengfei Ma, Yue Liu, Yusheng Zhang, Lian Zhou

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Abstract

Herein, in-situ sintered micro-nano Ti2AlC/TiAl composite with fully lamellar structures were designed by spark plasma sintering to improve the high-temperature oxidation resistance of TiAl alloys. The Ti2AlC/TiAl composite exhibited lower oxidation rate and thinner oxide scale enriched Al2O3 compared to TiAl alloy after 750 ℃ and 850 ℃ oxidation, suggesting that oxidation resistance of the Ti2AlC/TiAl composite was improved. The superior oxidation resistance of the Ti2AlC/TiAl composite was mainly attributed to Ti2AlC particles hindered the diffusion of O atoms and stabilized the Al-rich oxide layer by the formation of more Ti-Al-N layers due to the nitridation susceptibility of Ti2AlC.

Original languageEnglish
Article number110639
JournalCorrosion Science
Volume208
DOIs
StatePublished - Nov 2022
Externally publishedYes

Keywords

  • Composites
  • Oxidation
  • SPS
  • TiAl alloy

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