In situ TEM observation of dislocation evolution in Kr-irradiated UO 2 single crystal

Ling Feng He; Mahima Gupta; Clarissa A. Yablinsky; Jian Gan; Marquis A. Kirk; Xian Ming Bai; Janne Pakarinen; Todd R. Allen

doi:10.1016/j.jnucmat.2013.06.050

In situ TEM observation of dislocation evolution in Kr-irradiated UO ₂ single crystal

Ling Feng He^*
, Mahima Gupta
, Clarissa A. Yablinsky
, Jian Gan
, Marquis A. Kirk
, Xian Ming Bai
, Janne Pakarinen
, Todd R. Allen

^*Corresponding author for this work

Not published at VTT

Research output: Contribution to journal › Article › Scientific › peer-review

67 Citations (Scopus)

Abstract

In situ transmission electron microscopy (TEM) observation of UO₂ single crystal irradiated with Kr ions at high temperatures was conducted to understand the dislocation evolution due to high-energy radiation. The dislocation evolution in UO₂ single crystal is shown to occur as nucleation and growth of dislocation loops at low-irradiation doses, followed by transformation to extended dislocation segments and networks at high doses, as well as shrinkage and annihilation of some loops and dislocations due to high temperature annealing. Generally the trends of dislocation evolution in UO₂ were similar under Kr irradiation at different ion energies and temperatures (150 keV at 600 C and 1 MeV at 800 C) used in this work. Interstitial-type dislocation loops with Burgers vector along ⟨110⟩ were observed in the Kr-irradiated UO₂. The irradiated specimens were denuded of dislocation loops near the surface.

Original language	English
Pages (from-to)	71-77
Journal	Journal of Nuclear Materials
Volume	443
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2013.06.050
Publication status	Published - 2013
MoE publication type	A1 Journal article-refereed

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@article{fe292afccf754c0a897a0139562cf455,

title = "In situ TEM observation of dislocation evolution in Kr-irradiated UO 2 single crystal",

abstract = "In situ transmission electron microscopy (TEM) observation of UO2 single crystal irradiated with Kr ions at high temperatures was conducted to understand the dislocation evolution due to high-energy radiation. The dislocation evolution in UO2 single crystal is shown to occur as nucleation and growth of dislocation loops at low-irradiation doses, followed by transformation to extended dislocation segments and networks at high doses, as well as shrinkage and annihilation of some loops and dislocations due to high temperature annealing. Generally the trends of dislocation evolution in UO2 were similar under Kr irradiation at different ion energies and temperatures (150 keV at 600 C and 1 MeV at 800 C) used in this work. Interstitial-type dislocation loops with Burgers vector along ⟨110⟩ were observed in the Kr-irradiated UO2. The irradiated specimens were denuded of dislocation loops near the surface.",

author = "He, \{Ling Feng\} and Mahima Gupta and Yablinsky, \{Clarissa A.\} and Jian Gan and Kirk, \{Marquis A.\} and Bai, \{Xian Ming\} and Janne Pakarinen and Allen, \{Todd R.\}",

year = "2013",

doi = "10.1016/j.jnucmat.2013.06.050",

language = "English",

volume = "443",

pages = "71--77",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

number = "1-3",

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TY - JOUR

T1 - In situ TEM observation of dislocation evolution in Kr-irradiated UO 2 single crystal

AU - He, Ling Feng

AU - Gupta, Mahima

AU - Yablinsky, Clarissa A.

AU - Gan, Jian

AU - Kirk, Marquis A.

AU - Bai, Xian Ming

AU - Pakarinen, Janne

AU - Allen, Todd R.

PY - 2013

Y1 - 2013

N2 - In situ transmission electron microscopy (TEM) observation of UO2 single crystal irradiated with Kr ions at high temperatures was conducted to understand the dislocation evolution due to high-energy radiation. The dislocation evolution in UO2 single crystal is shown to occur as nucleation and growth of dislocation loops at low-irradiation doses, followed by transformation to extended dislocation segments and networks at high doses, as well as shrinkage and annihilation of some loops and dislocations due to high temperature annealing. Generally the trends of dislocation evolution in UO2 were similar under Kr irradiation at different ion energies and temperatures (150 keV at 600 C and 1 MeV at 800 C) used in this work. Interstitial-type dislocation loops with Burgers vector along ⟨110⟩ were observed in the Kr-irradiated UO2. The irradiated specimens were denuded of dislocation loops near the surface.

AB - In situ transmission electron microscopy (TEM) observation of UO2 single crystal irradiated with Kr ions at high temperatures was conducted to understand the dislocation evolution due to high-energy radiation. The dislocation evolution in UO2 single crystal is shown to occur as nucleation and growth of dislocation loops at low-irradiation doses, followed by transformation to extended dislocation segments and networks at high doses, as well as shrinkage and annihilation of some loops and dislocations due to high temperature annealing. Generally the trends of dislocation evolution in UO2 were similar under Kr irradiation at different ion energies and temperatures (150 keV at 600 C and 1 MeV at 800 C) used in this work. Interstitial-type dislocation loops with Burgers vector along ⟨110⟩ were observed in the Kr-irradiated UO2. The irradiated specimens were denuded of dislocation loops near the surface.

UR - https://www.scopus.com/pages/publications/84880894907

U2 - 10.1016/j.jnucmat.2013.06.050

DO - 10.1016/j.jnucmat.2013.06.050

M3 - Article

AN - SCOPUS:84880894907

SN - 0022-3115

VL - 443

SP - 71

EP - 77

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3

ER -

In situ TEM observation of dislocation evolution in Kr-irradiated UO ₂ single crystal

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