Journal
ACTA MATERIALIA
Volume 147, Issue -, Pages 277-283Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.01.003
Keywords
Loop rafting; Transmission electron microscopy; Burgers vector; Heavy ion irradiation; Nanocrystalline
Funding
- Laboratory Directed Research and Development program of Los Alamos National Laboratory [20160674PRD3]
Ask authors/readers for more resources
Dislocation loop rafting and dislocation decoration have been previously observed in neutron and heavy ion irradiated materials. Understanding the fundamental aspects of these phenomena assist in evaluating irradiation damage of nuclear materials. Multiple different mechanisms have been suggested to explain loop rafting. Here, we performed a detailed transmission electron microscopy study on dislocation loop rafts in heavy ion irradiated tungsten. Different imaging conditions showed that the rafts are of < 111 > Burgers vector type and specifically the same < 111 > Burgers vector variant (<1<(1)over bar>1>) in the particular grain analyzed. Some rafts were associated with dislocation lines while some form as a result of alignment of dislocation loops. They were shown to form at both room temperature (RT) and high temperature with stronger rafts forming at RT. These observations confirm the mechanism previously suggested by Wen et al. which explains raft formation due to loop glide, cluster-cluster and grown-in dislocation cluster interaction with subsequent Burgers vector rotation. Similar irradiation studies on nanocrystal-line tungsten showed that these materials are more resistant to raft formation at RT irradiations. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available