Volume 119, Number 5, September 2017
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||16 November 2017|
Cascade debris overlap mechanism of 〈100〉 dislocation loop formation in Fe and FeCr
1 Department of Physics, University of Helsinki - P. O. Box 43, FIN-00014 Helsinki, Finland
2 CCFE, Culham Science Centre - Abingdon, Oxon, OX14 3DB, UK
Received: 18 July 2017
Accepted: 12 October 2017
Two types of dislocation loops are observed in irradiated α-Fe, the 1/2〈111〉 loop and the 〈100〉 loop. Atomistic simulations consistently predict that only the energetically more favourable 1/2〈111〉 loops are formed directly in cascades, leaving the formation mechanism of 〈100〉 loops an unsolved question. We show how 〈100〉 loops can be formed when cascades overlap with random pre-existing primary radiation damage in Fe and FeCr. This indicates that there are no specific constraints involved in the formation of 〈100〉 loops, and can explain their common occurrence.
PACS: 61.72.Lk – Linear defects: dislocations, disclinations / 61.80.Az – Theory and models of radiation effects
© EPLA, 2017
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