Anomalous bias factors of dislocations in bcc iron

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  • KTH - Royal Institute of Technology
  • Swedish Radiation Safety Authority
  • UU - Uppsala University

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Dislocation bias factors in bcc Fe have been calculated based on atomistic interaction energy maps on three kinds of dislocations, namely the a0/2h111i{110} screw, a0/2h111i{110} and a0h100i{001} edge dislocations. The results show that the dislocation bias is higher for the a0/2h111i edge dislocation than for the a0h100i edge dislocation, even though the latter possesses a larger Burgers vector. This indicates the importance of the dislocation core contribution. For the a0/2h111i{110} screw dislocation, a negative dislocation bias has been obtained, which implies a more efficient absorption of vacancies than of SIAs. The effect of coexistence of both edge- and screw dislocations are assessed by a total bias. A possible complementary mechanism for explaining the long swelling incubation time in bcc metals is suggested and discussed.


Original languageEnglish
Pages (from-to)221-229
Number of pages9
JournalJournal of Nuclear Materials
Publication statusPublished - 17 Mar 2015


  • bias factors, dislocations, bcc iron

ID: 3368215