TY - JOUR
T1 - Microstructure of TRISO coated particles from the AGR-1 experiment
T2 - SiC grain size and grain boundary character
AU - Kirchhofer, Rita
AU - Hunn, John D.
AU - Demkowicz, Paul A.
AU - Cole, James I.
AU - Gorman, Brian P.
PY - 2013/1
Y1 - 2013/1
N2 - Pre-irradiation SiC microstructures in tristructural-isotropic (TRISO) coated fuel particles from the Advanced Gas Reactor Fuel Development and Qualification program's first irradiation experiment (AGR-1) were quantitatively characterized using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). From EBSD, it was determined that only the cubic polymorph of as-deposited SiC was present and the SiC had a high fraction of coincident site lattice (CSL) Σ3 grain boundaries. Additionally, the local area misorientation (LAM), which is a qualitative measurement of strain in the SiC lattice, was mapped for each sample fuel variant. The morphology of the SiC/IPyC interfaces were characterized by TEM following site-specific focused ion beam (FIB) specimen preparation. It was determined that the SiC layer had a heavily faulted microstructure typical of chemical vapor deposition (CVD) SiC and that the average grain diameter increased radially from the SiC/IPyC interface for the samples manufactured with similar CVD conditions, while the last sample showed a nearly constant grain size across the layer.
AB - Pre-irradiation SiC microstructures in tristructural-isotropic (TRISO) coated fuel particles from the Advanced Gas Reactor Fuel Development and Qualification program's first irradiation experiment (AGR-1) were quantitatively characterized using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). From EBSD, it was determined that only the cubic polymorph of as-deposited SiC was present and the SiC had a high fraction of coincident site lattice (CSL) Σ3 grain boundaries. Additionally, the local area misorientation (LAM), which is a qualitative measurement of strain in the SiC lattice, was mapped for each sample fuel variant. The morphology of the SiC/IPyC interfaces were characterized by TEM following site-specific focused ion beam (FIB) specimen preparation. It was determined that the SiC layer had a heavily faulted microstructure typical of chemical vapor deposition (CVD) SiC and that the average grain diameter increased radially from the SiC/IPyC interface for the samples manufactured with similar CVD conditions, while the last sample showed a nearly constant grain size across the layer.
UR - http://www.scopus.com/inward/record.url?scp=84866896004&partnerID=8YFLogxK
U2 - 10.1016/j.jnucmat.2012.08.052
DO - 10.1016/j.jnucmat.2012.08.052
M3 - Article
AN - SCOPUS:84866896004
SN - 0022-3115
VL - 432
SP - 127
EP - 134
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1-3
ER -