Metallurgical and Materials Transactions A

, Volume 33, Issue 3, pp 783–789 | Cite as

Mobility of interstitial clusters in alpha-zirconium

  • N. de Diego
  • Y. N. Osetsky
  • D. J. Bacon
Article

Abstract

Clusters of self-interstitial atoms (SIAs) formed in displacement cascades in metals irradiated with energetic particles play an important role in microstructure evolution under irradiation. They have been studied in the fcc and bcc metals by atomic-scale computer simulation, and in this article, we present the results of a similar study in a hexagonal close-packed (hcp) crystal. Static and dynamic properties of clusters of up to 30 SIAs were studied using a many-body Finnis-Sinclair type interatomic potential for Zr. The results show a qualitative similarity of some properties of clusters to those for cubic metals. In particular, all clusters larger than four SIAs exhibit fast thermally activated one-dimensional (1-D) glide, which is in a 〈11\(\bar 2\)0〉 direction in the hcp lattice. Due to the structure of the hcp lattice, this mechanism leads to two-dimensional mass transport in basal planes. Some clusters exhibit behavior peculiar to the hcp structure, for they can migrate two-dimensionally (2-D) in the basal plane. The jump frequency, activation energy, and correlation factors of clusters have been estimated, and comparisons drawn between the behavior of SIA clusters in different structures.

Keywords

Material Transaction Basal Plane Dislocation Loop Prism Plane Jump Frequency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2002

Authors and Affiliations

  • N. de Diego
    • 1
  • Y. N. Osetsky
    • 2
  • D. J. Bacon
    • 2
  1. 1.the Department of Physics of Materials, Faculty of Physical SciencesComplutense UniversityMadridSpain
  2. 2.the Materials Science and Engineering, Department of EngineeringThe University of LiverpoolLiverpoolUnited Kingdom

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