The brittle-ductile transition in single-crystal iron

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

doi:10.1016/j.actamat.2008.06.025

The brittle-ductile transition in single-crystal iron

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

Research output: Contribution to journal › Article › peer-review

58 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 language	English
Pages (from-to)	5123-5129
Number of pages	7
Journal	Acta Materialia
Volume	56
Issue number	18
DOIs	https://doi.org/10.1016/j.actamat.2008.06.025
Publication status	Published - Oct 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

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title = "The brittle-ductile transition in single-crystal iron",

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.",

author = "M. Tanaka and E. Tarleton and Roberts, {S. G.}",

note = "Funding Information: The work reported here was supported financially by the EPSRC under research Grant GR/M058811 and by UKAEA Culham Laboratory. We gratefully acknowledge useful discussions with Prof. S.L. Dudarev, Dr. A. Giannattasio and Dr. R. Novokshanov.",

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AU - Tanaka, M.

AU - Tarleton, E.

AU - Roberts, S. G.

N1 - Funding Information: The work reported here was supported financially by the EPSRC under research Grant GR/M058811 and by UKAEA Culham Laboratory. We gratefully acknowledge useful discussions with Prof. S.L. Dudarev, Dr. A. Giannattasio and Dr. R. Novokshanov.

PY - 2008/10

Y1 - 2008/10

N2 - 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.

AB - 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.

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The brittle-ductile transition in single-crystal iron

Abstract

All Science Journal Classification (ASJC) codes

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