Notch effects on deformation of crystalline and amorphous AlN – A nanoscale study

Yinbo Zhao, Xianghe Peng, Cheng Huang, Tao Fu, Bo Yang, Ning Hu, Yunfei Xi, Cheng Yan

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Aluminum nitrides (AlNs) have many unique properties for broad applications. However, their mechanical behaviour has not been well understood. In this work, the notch effects on the deformation of wurtzite AlN (w-AlN) and amorphous AlN (a-AlN) under tension were investigated using molecular dynamics simulations. As compared to w-AlN, lower strength sensitivity to the notch and the improved fracture toughness are observed in a-AlN, which are attributed to the short-range ordered atomic arrangement, rupture, reconstruction and rotation of bonds during deformation. The introduction of notch leads to obviously reduced strength and ductility in the w-AlN and a-AlN, respectively. The deformation in intact a-AlN is dominated by the formation of shear bands, followed by void coalescence. On the other hand, the deformation in notched a-AlN starts from the development of shear transformation zone near to the notches, followed by void coalescence. These results are useful in design of AlN based systems and devices.

Original languageEnglish
Pages (from-to)907-917
Number of pages11
JournalCeramics International
Volume45
Issue number1
DOIs
Publication statusPublished - 2019 Jan

Keywords

  • Amorphous AlN
  • Fracture toughness
  • Molecular dynamics simulations
  • Notch effect
  • Wurtzite AlN

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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