In situ observation of defect annihilation in Kr ion-irradiated bulk Fe/amorphous-Fe2Zr nanocomposite alloy

K. Y. Yu, Z. Fan, Y. Chen, M. Song, Y. Liu, H. Wang, M. A. Kirk, M. Li, X. Zhang

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

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 in situ Kr ion irradiation studies of a bulk Fe96Zr4 nanocomposite alloy. Irradiation resulted in amorphization of Fe2Zr and formed crystal/amorphous nanolayers. α-Fe layers exhibited drastically lower defect density and size than those in large α-Fe grains. In situ 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.

Original languageEnglish (US)
Pages (from-to)35-42
Number of pages8
JournalMaterials Research Letters
Volume3
Issue number1
DOIs
StatePublished - Aug 26 2014

Bibliographical note

Funding Information:
Acknowledgements We acknowledge financial support by NSF-DMR-Metallic Materials and Nanostructures Program under grant no. 1304101. ZF and YL are supported financially by NSF-CMMI 1161978. K.Y. Yu acknowledges financial support by Science Foundation of China University of Petroleum, Beijing (no. 2462014 YJRC019). XZ and HW also acknowledge Strategic research fund for new research initiatives provided by College of Engineering, Texas A&M University. We also thank Peter M. Baldo and Edward A. Ryan at Argonne National Laboratory for their help during in situ irradiation experiments. The IVEM facility at Argonne National Laboratory is supported by DOE-BES. Access to the DOE—Center for Integrated Nanotechnologies (CINT) at Los Alamos and Sandia National Laboratories and Microscopy and Imaging Center at Texas A&M University is also acknowledged.

Keywords

  • Absorption
  • Annihilation
  • Defect cluster
  • Heavy ion irradiation

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