TY - JOUR
T1 - Evolution of radiation-induced lattice defects in 20/25 Nb-stabilised austenitic stainless steel during in-situ proton irradiation
AU - Barcellini, C.
AU - Harrison, R. W.
AU - Dumbill, S.
AU - Donnelly, S. E.
AU - Jimenez-Melero, E.
PY - 2019/2
Y1 - 2019/2
N2 - We have monitored in situ the lattice defect evolution induced by proton irradiation in 20Cr-25Ni Nb-stabilised stainless steel, used as fuel cladding material in advanced gas-cooled reactors. At 420 °C, the damaged microstructure is mainly characterised by black spots and faulted [Formula presented]〈111〉 Frank loops. Defect saturation is reached at only 0.1dpa. In contrast, at 460 °C and 500 °C proton bombardment induces the formation of a mixture of [Formula presented]〈111〉 Frank loops and perfect [Formula presented]〈110〉 loops. These perfect loops evolve into dislocation lines that form a dense network. This transition coincides with the saturation in the dislocation loop size and number density at 0.8dpa (460 °C) and 0.2dpa (500 °C), respectively. The presence of a high density of dislocation loops and lines at those two temperatures causes a vacancy supersaturation in the matrix, leading to the formation of voids and stacking fault tetrahedra.
AB - We have monitored in situ the lattice defect evolution induced by proton irradiation in 20Cr-25Ni Nb-stabilised stainless steel, used as fuel cladding material in advanced gas-cooled reactors. At 420 °C, the damaged microstructure is mainly characterised by black spots and faulted [Formula presented]〈111〉 Frank loops. Defect saturation is reached at only 0.1dpa. In contrast, at 460 °C and 500 °C proton bombardment induces the formation of a mixture of [Formula presented]〈111〉 Frank loops and perfect [Formula presented]〈110〉 loops. These perfect loops evolve into dislocation lines that form a dense network. This transition coincides with the saturation in the dislocation loop size and number density at 0.8dpa (460 °C) and 0.2dpa (500 °C), respectively. The presence of a high density of dislocation loops and lines at those two temperatures causes a vacancy supersaturation in the matrix, leading to the formation of voids and stacking fault tetrahedra.
KW - Advanced gas-cooled reactor
KW - Austenitic stainless steel
KW - Dislocation analysis
KW - In-situ proton irradiation
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=85056863224&partnerID=8YFLogxK
U2 - 10.1016/j.jnucmat.2018.11.019
DO - 10.1016/j.jnucmat.2018.11.019
M3 - Article
AN - SCOPUS:85056863224
VL - 514
SP - 90
EP - 100
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
ER -