Abstract
In order to study the migration of point defects in Fe–Al alloys within the range of 25–40 at.% Al quenching experiments were carried out. The equilibration process was observed by means of Doppler broadening of the 511 keV positron annihilation peak using a 22Na positron emitter. Annealing at different temperatures in B2′ and in D0 3 structure, respectively, permits the determination of effective migration enthalpies H M eff. Whereas annealing the Fe-25 at.% Al alloy in D0 3 structure and annealing the Fe-40 at.% Al alloy in B2 structure yields only one migration enthalpy of H M eff=0.45 eV and H M eff=1.2 eV, respectively, in Fe-30 at.% Al as well as in Fe-35 at.% Al two recovery stages could be observed. In Fe-30 at.% Al an early recovery stage is associated with H M eff =1.0 eV and a late one with H M eff=1.3 eV. In Fe-35 at.% Al the early stage is dominated by H M eff=0.9 eV and H M eff=1.8 eV, the late one by H M eff=1.8 eV and H M eff=1.7 eV for recovery in B2- and D0 3-structure, respectively.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
