Dual phase nano-particulate AlN composite — A kind of ceramics with high strength and ductility

Yinbo Zhao, Xianghe Peng, Bo Yang, Cheng Huang, Ning Hu, Cheng Yan

Research output: Contribution to journalArticle

Abstract

Ceramics are widely used in many fields due to their excellent properties. However, the brittle fracture is a short board restricting their applications. To understand their deformation mechanism and explore a way to enhance both the strength and ductility, we investigated the mechanical behaviour of dual-phase AlNs composed of amorphous AlN matrix and crystalline nanoparticles under compression via molecular dynamics simulations. The stress concentration exists at the interface of nanocomposite AlN, where the particles and matrix are in the tensile and compressive states of stress, respectively. Strain hardening occurs when crystalline nanoparticle fraction fv ≥ 40.9%, attributed to the intersection between shear bands. The phase transformation from wurtzite structure (B4) to graphene-like structure (GL) is observed in the crystalline phase, as a result of high hydrostatic stress. After phase transformation, the particle might be cut into half during further compression along with the recovery of the GL structure to the wurtzite structure that could still bear load. The investigation of the effects of the volume fraction, surface-to-volume ratio, distribution pattern of the crystalline nanoparticles indicates that the dual-phase AlN nanocomposite with fv ≥ 40.9% and triangle distribution of particles would possess both higher strength and ductility.

Original languageEnglish
Pages (from-to)19845-19855
Number of pages11
JournalCeramics International
Volume45
Issue number16
DOIs
Publication statusPublished - 2019 Nov
Externally publishedYes

Keywords

  • Interface
  • Molecular dynamics simulations
  • Nanocomposite AlN
  • Phase transformation
  • Shear band

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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