In-situ synthesis of Al2O3-reinforced high Nb–TiAl laminated composite with an enhanced strength-toughness performance

Donghai Li, Binbin Wang, Liangshun Luo*, Xuewen Li, Jianxin Yu, Liang Wang, Yanjin Xu, Yanqing Su*, Jingjie Guo, Hengzhi Fu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

In this work, the Al2O3-reinforced high Nb–TiAl laminated composite is successfully fabricated by an innovative way of direct-current magnetron sputtering combined with the foil-foil metallurgy, with assistance of vacuum hot-pressed sintering. Here, the Nb-coated aluminum foil and titanium foil, microstructure evolution, the lamellar plane distribution and the mechanical performances are carefully studied. Specifically, the composite is composed of the α2-Ti3Al, γ-TiAl and α-Al2O3 phase, in which the high Nb–TiAl matrix has a fully lamellar microstructure and a high content (∼6.5%) of Nb. Taken the textured titanium foil as raw material, the multi-stage annealing process is proved to be an effective way to control the lamellar plane distribution in the high Nb–TiAl matrix, showing that 82.3% of the lamellar planes forms an angle less than 30° from the RD-ND plane of the composite. Moreover, the bending strength and fracture toughness of the composite reach 817 MPa and 12.41 MPa m1/2, respectively. Further, the toughening and strengthening mechanisms are also detailly discussed. We believe that the major findings in this work can provide a new idea to design the high strength-toughness intermetallic-ceramic composites.

Original languageEnglish
Pages (from-to)1589-1602
Number of pages14
JournalCeramics International
Volume48
Issue number2
DOIs
Publication statusPublished - 15 Jan 2022
Externally publishedYes

Keywords

  • AlO
  • Composite
  • Hot pressing
  • Strength
  • Toughness and toughening

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Li, D., Wang, B., Luo, L., Li, X., Yu, J., Wang, L., Xu, Y., Su, Y., Guo, J., & Fu, H. (2022). In-situ synthesis of Al2O3-reinforced high Nb–TiAl laminated composite with an enhanced strength-toughness performance. Ceramics International, 48(2), 1589-1602. https://doi.org/10.1016/j.ceramint.2021.09.238