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Title: Grain Boundary and Lattice Fracture Toughness of UO2 Measured Using Small-Scale Mechanics

Abstract

Small-scale mechanical testing has been used to isolate the properties of individual grain boundaries and regions of the lattice in undoped UO2 polycrystals. Notched microcantilever specimens were prepared by focused ion beam milling and tested in bending. Fracture toughness values were calculated from finite element analysis of the sample geometry at fracture load using the J-integral method. Lattice and grain boundary fracture toughness values of 1.17 ± 0.16 MPa m1/2 and 1.08 ± 0.08 MPa m1/2, respectively, were obtained. The similarity between the lattice and grain boundary fracture toughness values is consistent with the preference for transgranular room-temperature fracture in UO2. The grain boundary and lattice fracture toughness values also agree well with the toughness of dense polycrystals, which suggests that microstructural-scale toughening mechanisms are limited in such samples.

Authors:
 [1]; ORCiD logo [2];  [3];  [3]; ORCiD logo [2]
  1. Sun Yat-Sen Univ., Guangzhou (China); Univ. of Illinois at Urbana-Champaign, IL (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1615789
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 72; Journal Issue: 5; Journal ID: ISSN 1047-4838
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Feng, Lin, Finkeldei, Sarah, Heuser, Brent J., Dillon, Shen, and Nelson, Andrew. Grain Boundary and Lattice Fracture Toughness of UO2 Measured Using Small-Scale Mechanics. United States: N. p., 2020. Web. doi:10.1007/s11837-020-04118-3.
Feng, Lin, Finkeldei, Sarah, Heuser, Brent J., Dillon, Shen, & Nelson, Andrew. Grain Boundary and Lattice Fracture Toughness of UO2 Measured Using Small-Scale Mechanics. United States. doi:https://doi.org/10.1007/s11837-020-04118-3
Feng, Lin, Finkeldei, Sarah, Heuser, Brent J., Dillon, Shen, and Nelson, Andrew. Mon . "Grain Boundary and Lattice Fracture Toughness of UO2 Measured Using Small-Scale Mechanics". United States. doi:https://doi.org/10.1007/s11837-020-04118-3. https://www.osti.gov/servlets/purl/1615789.
@article{osti_1615789,
title = {Grain Boundary and Lattice Fracture Toughness of UO2 Measured Using Small-Scale Mechanics},
author = {Feng, Lin and Finkeldei, Sarah and Heuser, Brent J. and Dillon, Shen and Nelson, Andrew},
abstractNote = {Small-scale mechanical testing has been used to isolate the properties of individual grain boundaries and regions of the lattice in undoped UO2 polycrystals. Notched microcantilever specimens were prepared by focused ion beam milling and tested in bending. Fracture toughness values were calculated from finite element analysis of the sample geometry at fracture load using the J-integral method. Lattice and grain boundary fracture toughness values of 1.17 ± 0.16 MPa m1/2 and 1.08 ± 0.08 MPa m1/2, respectively, were obtained. The similarity between the lattice and grain boundary fracture toughness values is consistent with the preference for transgranular room-temperature fracture in UO2. The grain boundary and lattice fracture toughness values also agree well with the toughness of dense polycrystals, which suggests that microstructural-scale toughening mechanisms are limited in such samples.},
doi = {10.1007/s11837-020-04118-3},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
number = 5,
volume = 72,
place = {United States},
year = {2020},
month = {3}
}

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