TY - JOUR
T1 - Study of the effect of PKA energy on long-term microstructural evolution in irradiated FeMnNi alloys
AU - Li, Jianyang
AU - Balbuena, J.P.
AU - Zhao, Shijun
AU - Yang, Yitao
AU - Zhang, Chonghong
PY - 2025/5
Y1 - 2025/5
N2 - Herein, we used a multiscale simulation method to investigate the variation rule of the long-term feature of irradiation defects versus primary knock-on atom (PKA) energies (5 keV–100 keV) in dilute FeMnNi alloys. Simulation results presented a significant effect of PKA energy on irradiation microstructure, the density of large defect clusters increases significantly with increasing PKA energy, and the difference in the number density of visible defect clusters can reach several times to about one order of magnitude at the dose rate of 1 × 10−4dpa/s. The migration events of point defects (PD) decrease significantly with increasing PKA energy, suggesting that a higher PD flux at lower PKA energy could probably enhance the radiation-induced segregation (RIS) in alloys. Additionally, since the generation mechanism involves specific SIA-cluster sizes, the production ratio of <100>-type SIA loops could also influenced by PKA energies. Our simulation results align with experimental differences in the microstructure of light and heavy-ion irradiated alloys. This work clarified the mechanism of PKA energy effects in dilute alloys and provides a certain scientific basis for the comparison and emulation of different particle irradiation. © 2024 Korean Nuclear Society.
AB - Herein, we used a multiscale simulation method to investigate the variation rule of the long-term feature of irradiation defects versus primary knock-on atom (PKA) energies (5 keV–100 keV) in dilute FeMnNi alloys. Simulation results presented a significant effect of PKA energy on irradiation microstructure, the density of large defect clusters increases significantly with increasing PKA energy, and the difference in the number density of visible defect clusters can reach several times to about one order of magnitude at the dose rate of 1 × 10−4dpa/s. The migration events of point defects (PD) decrease significantly with increasing PKA energy, suggesting that a higher PD flux at lower PKA energy could probably enhance the radiation-induced segregation (RIS) in alloys. Additionally, since the generation mechanism involves specific SIA-cluster sizes, the production ratio of <100>-type SIA loops could also influenced by PKA energies. Our simulation results align with experimental differences in the microstructure of light and heavy-ion irradiated alloys. This work clarified the mechanism of PKA energy effects in dilute alloys and provides a certain scientific basis for the comparison and emulation of different particle irradiation. © 2024 Korean Nuclear Society.
KW - Defect evolution
KW - Irradiation effect
KW - PKA energy
KW - RPV steels
KW - Simulation
UR - http://www.scopus.com/inward/record.url?scp=105001078896&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-105001078896&origin=recordpage
U2 - 10.1016/j.net.2024.103369
DO - 10.1016/j.net.2024.103369
M3 - RGC 21 - Publication in refereed journal
SN - 1738-5733
VL - 57
JO - Nuclear Engineering and Technology
JF - Nuclear Engineering and Technology
IS - 5
M1 - 103369
ER -