A phenomenological micromechanical model of FCC metals under radiation induced crystal defects

Yoshiteru Aoyagi, Tomohito Tsuru, Yoshiyuki Kaji

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Crystal defects induced by irradiation obstruct dislocation movement. Hence, the critical resolved shear stress of irradiated material increases. While part of the radiation defects are swept by dislocations released from dislocation sources; therefore localization of plastic deformation are caused by a decrease of radiation defects at the partial region. In this study, in order to predict increase of flow stress due to irradiation, information of density of radiation defects is introduced into a hardening modulus of crystal plasticity. Moreover, a decrease of the work-hardening ratio is represented by considering the disappearance of the radiation defects originating in the dislocation movement. Values of the controlling parameters operating effect of the radiation defects on the flow stress are estimated by a molecular dynamics simulation. We conduct crystal plasticity simulations for copper single crystals under a simple tensile condition. The macroscopic stress-strain responses such as the increase of yield stress and the decrease of work-hardening ratio due to irradiation are numerically predicted. We investigate the effect of radiation defects and the dislocation behaviors on processes of the strain localization.

Original languageEnglish
Title of host publicationEffects of Radiation on Nuclear Materials
Subtitle of host publication25th Volume
PublisherASTM International
Pages269-287
Number of pages19
ISBN (Print)9780803175334
DOIs
Publication statusPublished - 2013 Jan 1
Event25th Symposium on the Effects of Radiation on Nuclear Materials - Anaheim, CA, United States
Duration: 2011 Jun 152011 Jun 17

Publication series

NameASTM Special Technical Publication
Volume1547 STP
ISSN (Print)0066-0558

Other

Other25th Symposium on the Effects of Radiation on Nuclear Materials
CountryUnited States
CityAnaheim, CA
Period11/6/1511/6/17

Keywords

  • Crystal plasticity
  • Dislocation
  • Irradiated material
  • Molecular dynamics
  • Radiation defect

ASJC Scopus subject areas

  • Materials Science(all)

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  • Cite this

    Aoyagi, Y., Tsuru, T., & Kaji, Y. (2013). A phenomenological micromechanical model of FCC metals under radiation induced crystal defects. In Effects of Radiation on Nuclear Materials: 25th Volume (pp. 269-287). (ASTM Special Technical Publication; Vol. 1547 STP). ASTM International. https://doi.org/10.1520/STP103983