Ultrafast annihilation of irradiation-induced defects using pulsed electric current for damage performance regeneration  

作　　者：Biqian Li Rui Ma Shu Li Xinfang Zhang 

机构地区：[1]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Materials Science & Technology》2024年第27期247-262,共16页材料科学技术(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.U21B2082);the Beijing Municipal Natural Science Foundation(No.2222065);the Fundamental Research Funds for the Central Universities(No.FRF-TP-22-02C2).

摘　　要：As the most important irradiation-induced defects,dislocation loop and copper-rich nanocluster are the major contributors to the embrittlement of the neutron-irradiated reactor pressure vessel steels.In this study,such nano-defects were introduced into the material by 3 MeV Fe ions up to the dose of 1 dpa at high temperature(290℃)to simulate neutron irradiation.It was found that pulsed electric current can effectively reduce 95%of irradiation-induced hardening.Correspondingly,the characterization results showed that almost all the dislocation loops disappeared and the quantity of copper-rich nanoclusters also reduced greatly at relatively low temperature(450℃),and the process took only 20 min.Mean-while,it was qualitatively proved by positron annihilation spectroscopy that the number of irradiation-induced vacancy-type defects and solute-enriched clusters was significantly decreased after electropuls-ing.Furthermore,under the pulsed electric field,the rapid annihilation of the dislocation loops due to their accelerated collision with vacancies can remove the nucleation sites of the copper-rich nanoclusters and make them become dispersed,further promoting the nanoclusters that lack nucleation sites dissolv-ing faster.Therefore,this electropulsing treatment provides a practical“in-situ”performance repair tech-nology to extend the service life of reactor pressure vessel steels by regulating the interaction between vacancies,interstitial atoms and irradiation-induced defects.

关 键 词：Irradiation-induced defect Dislocation loop Copper-rich nanocluster Pulsed electric current Performance regeneration 

分 类 号：TG1[金属学及工艺—金属学]