The brittle-ductile transition in single-crystal iron

M. Tanaka, E. Tarleton, S. G. Roberts

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

The fracture behaviour of single-crystal pure iron was studied by four-point bending of pre-cracked specimens at temperatures between 77 and 180 K and strain rates between 4.46 × 10-5 and 4.46 × 10-3 s-1. Fracture behaviour changes from brittle to ductile with increasing temperature. The brittle-ductile transition (BDT) temperature increases with increasing strain rate. The relation between BDT temperature and strain rate follows an Arrhenius relation, giving an activation energy for the BDT of 0.33 eV. Dislocation-dynamics simulations of the crack-tip plasticity and resultant shielding of the crack tip were performed using two different variants of the dislocation velocity/stress/temperature relation. The models predict an explicit BDT, and give a good quantitative fit to the experimental transition temperatures.

Original languageEnglish
Pages (from-to)5123-5129
Number of pages7
JournalActa Materialia
Volume56
Issue number18
DOIs
Publication statusPublished - Oct 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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