A novel Fe-10Cr ferritic/martensitic steel called SIMP was chosen to investigate synergistic effects of H and He on the mechanical properties of structural materials for innovative nuclear energy systems. Sequential a...A novel Fe-10Cr ferritic/martensitic steel called SIMP was chosen to investigate synergistic effects of H and He on the mechanical properties of structural materials for innovative nuclear energy systems. Sequential and separate irradiation experiments on SIMP steel specimens at room temperature using H and He ions with various energy levels were conducted to produce an ion deposition plateau at 300-650 nm. The indentation stress-strain responses were examined using spherical nanoindentation tests after the irradiation experiments. It was found that the sequential irradiation by He and H produced a higher indentation yield stress than separate irradiation, indicating that the hardening was enhanced by the synergy of the H and He irradiation. The micro-mechanism responsible for enhancing the hardening of the SIMP steel through the H and He synergy was investigated using Doppler broadening spectroscopy detection and transmission electron spectroscopy observations.展开更多
Bulk Cu/V multilayers simultaneously possess high strength and excellent radiation resistance thanks to their high density of interfaces.Irradiation-induced atomic mixing of Cu/V multilayers has been less investigated...Bulk Cu/V multilayers simultaneously possess high strength and excellent radiation resistance thanks to their high density of interfaces.Irradiation-induced atomic mixing of Cu/V multilayers has been less investigated.Here,we investigate the ion irradiation of bulk Cu/V multilayers exposed to H2^+ or He^+ ions at 350℃.The microstructure and elemental distribution are investigated by transmission electron microscopy and energy dispersive x-ray spectroscopy.Facetted bubbles and atomic mixing are observed after ion irradiation.The possible mechanisms of irradiation-induced atomic mixing are discussed.展开更多
Cavities and extended defects formed in single crystalline and polycrystalline α-SiC implanted with H+ions are compared.The samples are investigated by cross-sectional transmission electron microscopy.H2 bubbles are ...Cavities and extended defects formed in single crystalline and polycrystalline α-SiC implanted with H+ions are compared.The samples are investigated by cross-sectional transmission electron microscopy.H2 bubbles are formed during H implantation and H2 molecules escape the sample to form cavities during thermal annealing at 1100℃.Microcracks and the extended defects prefer to nucleate in single crystalline α-SiC,but not polycrystalline α-Si C.Grain boundaries can account for the experimental results.The formation of cavities on grain boundaries is investigated.展开更多
基金supported by the National Natural Science Foundation of China under grants(Nos.U1832206,11505246,11605256,91426301,11405231,11575258,11375242,and 11505247)the key projects of the Chinese Academy of Sciences(No.ZDRW-CN-2017-1)。
文摘A novel Fe-10Cr ferritic/martensitic steel called SIMP was chosen to investigate synergistic effects of H and He on the mechanical properties of structural materials for innovative nuclear energy systems. Sequential and separate irradiation experiments on SIMP steel specimens at room temperature using H and He ions with various energy levels were conducted to produce an ion deposition plateau at 300-650 nm. The indentation stress-strain responses were examined using spherical nanoindentation tests after the irradiation experiments. It was found that the sequential irradiation by He and H produced a higher indentation yield stress than separate irradiation, indicating that the hardening was enhanced by the synergy of the H and He irradiation. The micro-mechanism responsible for enhancing the hardening of the SIMP steel through the H and He synergy was investigated using Doppler broadening spectroscopy detection and transmission electron spectroscopy observations.
基金Supported by the National Natural Science Foundation of China(Grant No.U1832133)。
文摘Bulk Cu/V multilayers simultaneously possess high strength and excellent radiation resistance thanks to their high density of interfaces.Irradiation-induced atomic mixing of Cu/V multilayers has been less investigated.Here,we investigate the ion irradiation of bulk Cu/V multilayers exposed to H2^+ or He^+ ions at 350℃.The microstructure and elemental distribution are investigated by transmission electron microscopy and energy dispersive x-ray spectroscopy.Facetted bubbles and atomic mixing are observed after ion irradiation.The possible mechanisms of irradiation-induced atomic mixing are discussed.
基金Supported by the National Natural Science Foundation of China(Grant Nos.U1832133 and 11905206)。
文摘Cavities and extended defects formed in single crystalline and polycrystalline α-SiC implanted with H+ions are compared.The samples are investigated by cross-sectional transmission electron microscopy.H2 bubbles are formed during H implantation and H2 molecules escape the sample to form cavities during thermal annealing at 1100℃.Microcracks and the extended defects prefer to nucleate in single crystalline α-SiC,but not polycrystalline α-Si C.Grain boundaries can account for the experimental results.The formation of cavities on grain boundaries is investigated.
