4.7 Article

Irradiation-induced solute trapping by preexisting nanoprecipitates in high-strength low-alloy steel

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.143510

关键词

High-dose ion irradiation; Preexisting nanoprecipitates; High-strength low-alloy steel; Radiation-induced precipitation; Irradiation softening

资金

  1. National Key Research and Development Project [2018YFE0115800]
  2. Youth Talent Project of China National Nuclear Corporation [CNNC2019YTEP-HEU01, CNNC2021YTEP-HEU01]
  3. NSFC [52001083, 52171111, U2141207]
  4. China Postdoctoral Science Foundation [2019T120255]
  5. Natural Science Foundation of Heilongjiang [LH2019E030]
  6. China-Ukraine Intergovernmental Science and Technology Exchange Project [G4822007]
  7. Innovation Center of Nuclear Materials for National Defense Industry [HCL-08]
  8. Heilongjiang Touyan Innovation Team Program
  9. CityU [9360161]
  10. CRF [C1027-14E]
  11. Foundation of Key Laboratory of Radiation Physics and Technology of the Ministry of Education [2021SCURPT11]

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In this study, a high-strength low-alloy steel strengthened by nanoprecipitates was irradiated with high-energy Au2+ ions. The formation and coarsening of nanoprecipitates under irradiation were investigated. The results showed coprecipitation of Cu/Ni nanoprecipitates and the coarsening of these nanoprecipitates with increasing dose.
In the present study, a nanoprecipitate-strengthened high-strength low-alloy steel was irradiated by high-energy Au2+ ions with a peak dose of ~70 displacements per atom (dpa) at room temperature. The formation of nanoprecipitates, dislocation loops, elemental segregation and mechanical properties before and after irradiation were carefully characterized using atom probe tomography (APT), transmission electron microscopy (TEM) and nanoindentation. The mechanism of precipitation and coarsening of these nanoprecipitates and the effect of the dose on irradiation-induced solute capture were studied. The results show that, different from a simple aging induced precipitation of Cu-rich nanoprecipitates, coprecipitation of Cu/Ni nanoprecipitates occurred under irradiation. With increasing dose, the nanoprecipitates coarsened. Although irradiation induced the formation of small dislocation loops together with new nanoprecipitates, the abnormal softening that occurred after irradiation can be attributed to the coarsening of the preexisting nanoprecipitates. These studies and discoveries are expected to provide unique and important information for the design of new structural alloys with enhanced radiation resistances.

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