Affordable Access

Shock-induced structural phase transition, plasticity, and brittle cracks in aluminum nitride ceramic.

Authors
  • Branicio, Paulo S
  • Kalia, Rajiv K
  • Nakano, Aiichiro
  • Vashishta, Priya
Type
Published Article
Journal
Physical review letters
Publication Date
Feb 17, 2006
Volume
96
Issue
6
Pages
65502–65502
Identifiers
PMID: 16606007
Source
Medline
License
Unknown

Abstract

Atomistic mechanisms of fracture accompanying structural phase transformation (SPT) in AlN ceramic under hypervelocity impact are investigated using a 209 x 10(6) atom molecular-dynamics simulation. The shock wave generated by the impact splits into an elastic wave and a slower SPT wave that transforms the wurtzite structure into the rocksalt phase. The interaction between the reflected elastic wave and the SPT wave front generates nanovoids and dislocations into the wurtzite phase. Nanovoids coalesce into mode I cracks while dislocations give rise to kink bands and mode II cracking.

Report this publication

Statistics

Seen <100 times