<i>In situ</i> Observation of Defect Annihilation in Kr Ion-Irradiated Bulk Fe/Amorphous-Fe<sub>2</sub>Zr Nanocomposite Alloy
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Enhanced irradiation tolerance in crystalline multilayers has received significant attention lately. However, little is known on the irradiation response of crystal/amorphous nanolayers. We report on <i>in situ</i> Kr ion irradiation studies of a bulk Fe<sub>96</sub>Zr<sub>4</sub> nanocomposite alloy. Irradiation resulted in amorphization of Fe<sub>2</sub>Zr and formed crystal/amorphous nanolayers. α-Fe layers exhibited drastically lower defect density and size than those in large α-Fe grains. <i>In situ</i> video revealed that mobile dislocation loops in α-Fe layers were confined by the crystal/amorphous interfaces and kept migrating to annihilate other defects. This study provides new insights on the design of irradiation-tolerant crystal/amorphous nanocomposites.
