Temperature-dependent elastic stiffness constants of fcc-based metal nitrides from first-principles calculations

Aijun Wang, Shun Li Shang, Mingzhi He, Yong Du, Li Chen, Rui Zhang, Deliang Chen, Bingbing Fan, Feiyan Meng, Zi Kui Liu

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Temperature-dependent single-crystal elastic stiffness constants and the associated polycrystalline aggregate properties of fcc-based metal nitrides (MNs; M = Ti, Al, Zr, and Hf) have been investigated using a quasistatic approach via first-principles calculations. It is confirmed that the four studied nitrides are brittle materials and mechanically stable, agreeing with experimental results. Among these compounds, TiN and AlN possess the highest strength and the highest hardness, respectively. The cross-slip and the resistance to microcracks are analyzed based on the elastic anisotropy ratio. Additionally, it is found that the decreasing trend of C11 with respect to temperature is larger than that of C12 or C44. With increasing temperature, the resistance of shear deformation, stiffness, hardness, and strength of these four nitrides decrease. The computed properties of MNs agree well with the experimental data available in the literature.

Original languageEnglish (US)
Pages (from-to)424-432
Number of pages9
JournalJournal of Materials Science
Volume49
Issue number1
DOIs
StatePublished - Jan 2014

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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