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Journal of Materials Science

, Volume 54, Issue 17, pp 11509–11525 | Cite as

Screw dislocation–spherical void interactions in fcc metals and their dependence on stacking fault energy

  • Sho HayakawaEmail author
  • Kohei Doihara
  • Taira Okita
  • Mitsuhiro Itakura
  • Masaatsu Aichi
  • Katsuyuki Suzuki
Computation & theory

Abstract

We performed molecular dynamics simulations to evaluate the effects of stacking fault energy (SFE) on interactions between a screw dislocation and spherical voids in face-centered cubic (fcc) metals. It was observed that the frequency of the cross-slips is a critical factor affecting the interaction, with primarily three different interaction morphologies being observed: (1) the two partial dislocations detach from the void independently with a time lag, (2) the two partial dislocations detach from the void almost simultaneously on a single slip plane, and (3) the two partial dislocations detach from the void almost simultaneously while involving more than one cross-slip and a jog formation. The magnitude of the critical resolved shear stress (CRSS) increases in the order mentioned above. The CRSS values for interaction morphology (2), which was observed most frequently in this study, were in good agreement with those predicted analytically by adjusting the parameters dependent on the SFE. Based on the obtained results, we discussed the applicability of the analytical model for void hardening in fcc metals. The results of this work contribute significantly to the modeling of mechanical property degradation in irradiated metals.

Notes

Acknowledgements

This work was supported by JSPS KAKENHI Grant Numbers JP17H03518, JP17KT0039 and JP18J12324. The computation was carried out using the computer resource offered under the category of General Projects by the Research Institute for Information Technology, Kyushu University.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of EngineeringUniversity of TokyoTokyoJapan
  2. 2.Research into Artifacts, Center for EngineeringUniversity of TokyoChibaJapan
  3. 3.Center for Computational Science & e-SystemsJapan Atomic Energy AgencyChibaJapan
  4. 4.Graduate School of Frontier SciencesUniversity of TokyoChibaJapan

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