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 D03 structure, respectively, permits the determination of effective migration enthalpies HMeff. Whereas annealing the Fe-25 at.% Al alloy in D03 structure and annealing the Fe-40 at.% Al alloy in B2 structure yields only one migration enthalpy of HMeff=0.45 eV and HMeff=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 HMeff =1.0 eV and a late one with HMeff=1.3 eV. In Fe-35 at.% Al the early stage is dominated by HMeff=0.9 eV and HMeff=1.8 eV, the late one by HMeff=1.8 eV and HMeff=1.7 eV for recovery in B2- and D03-structure, respectively.
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