TEM investigation of the oxide scale of Ti-46.5Al-5Nb at 900 °C for 50 h

Wei Lu, Chunlin Chen, Yanjun Xi, Changyou Guo, Fuhui Wang, Lianlong He

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

In the present work, microstructure of oxide scale of Ti-46.5Al-5Nb oxidized for 50 h at 900 °C in air was investigated in both plane-viewed and cross-sectional samples using transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). In the TiO2 and Al2O3 mixture layer, orientation relationships (OR) between the Al2O3 and TiO2 phases were identified to be [1 over(1, ̄) 0]Al2 O3 / / [001]TiO2 and (001)Al2 O3 / / (110)TiO2, however, some misorientation existed at their interface. Besides, Nb enrichment was detected in the TiO2 phase in this layer but no Nb was found in the outer TiO2 layer. Al3Nb phase was identified between the oxide scale and TiAl base. This phase would promote TiAl oxidation protection due to hinder 'x' phase continuous formation.

Original languageEnglish
Pages (from-to)824-831
Number of pages8
JournalIntermetallics
Volume15
Issue number5-6
DOIs
Publication statusPublished - 2007 May
Externally publishedYes

Keywords

  • A. Titanium aluminides, based on TiAl
  • B. Oxidation
  • F. Electron microscopy, transmission

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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