Elastic isotropy originating from heterogeneous interlayer elastic deformation in a Ti3SiC2 MAX phase with a nanolayered crystal structure

Ruxia Liu, Masakazu Tane, Hajime Kimizuka, Yuji Shirakami, Ken ichi Ikeda, Seiji Miura, Koji Morita, Tohru S. Suzuki, Yoshio Sakka, Lianmeng Zhang, Tohru Sekino

Research output: Contribution to journalArticlepeer-review

Abstract

The elastic properties of a single-crystalline Ti3SiC2 MAX phase with a nanolayered crystal structure, comprising Ti-Si and two distinct Ti-C bonding layers, that had remained unclear because of the difficulty in growing large single crystals, were studied. Rather than unavailable large single crystals, polycrystalline samples with a crystallographic texture were prepared. By analyzing the polycrystalline elastic constants on the basis of an inverse Voigt–Reuss–Hill approximation, the elastic properties of a single crystal Ti3SiC2 with a hexagonal symmetry were determined. This revealed that the single-crystalline Young's modulus was almost isotropic despite its highly anisotropic layered structure. The shear modulus for (0001)〈112¯0〉 was higher than that for {112¯0}[0001] in contrast to the basal slip-dominated plastic deformation reflecting the layered structure. Furthermore, first-principles calculations revealed that heterogeneous interlayer elastic deformation caused by the stabilization of Ti-Si bonding is the origin of the elastic isotropy in a Ti3SiC2 MAX phase.

Original languageEnglish
Pages (from-to)2278-2289
Number of pages12
JournalJournal of the European Ceramic Society
Volume41
Issue number4
DOIs
Publication statusPublished - 2021 Apr
Externally publishedYes

Keywords

  • Anisotropy
  • Elastic properties
  • First-principles calculations
  • MAX phase
  • Single crystal

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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