In-situ TEM characterization of the tensile deformation of ion-irradiated HT-UPS steel at RT and 400 °C

JOURNAL OF NUCLEAR MATERIALS

卷:529

Article

Xu, Chi^1,2  Lu, Yu²  Fu, Zhenyu²  Yang, Yong² 

[1] Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China

[2] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

关键词: HT-UPS steel;    Ion-irradiation;    In-situ straining;    Dislocation loops;    Deformation twins;    TEM;   

DOI  :  10.1016/j.jnucmat.2019.151911

来源: Elsevier

【 摘 要 】

High-temperature ultra-fine precipitate strengthened (HT-UPS) steel samples were irradiated with 1 MeV Kr ions, and in-situ tensile deformed at room temperature (RT) and 400 degrees C. The dislocation flow in irradiated samples was significantly restricted by the irradiation defects, and the deformation took place in localized deformation bands. While in unirradiated specimens, the deformation happened evenly across the grains. As a result of the localized deformation, intricate deformation band structures were observed in the irradiated specimens, which are composed of a central band and two defect reduced zones on the two sides. The irradiation defects were in-situ observed to interact with deformation induced dislocations, and were removed by the latter. Despite of the differences, the irradiated samples reserved similar work hardening behaviors as the unirradiated samples. The deformation inside the defect reduced bands in irradiated samples showed similar characteristics as in the unirradiated sample. The last stage deformation also showed similar deformation characteristics, regardless of the irradiation history. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

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