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cluster dynamics modeling of niobium and titanium carbide precipitates inα-Fe andγ-Fe

Chinese Physics B 2022年第2期31卷 509-515页

作者： Nadezda Korepanova Long Gu Mihai Dima Hushan Xu Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 101408China Institute for Physics and Nuclear Engineering Bucharest 077125Romania School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Paul Scherrer Institute Villigen 5232Switzerland

Kinetic behaviors of niobium and titanium carbide precipitates in iron are simulated with cluster *** simulations,carried out in austenite and ferrite for niobium carbides,and in austenite for titanium carbide,are analyzed for dependences on temperature,solute concentration,and initial cluster *** results are presented for different temperatures and solute concentrations,compared to experimental data *** show little impact of initial cluster distribution beyond a certain relaxation time and that highly dilute alloys with monomers only present a significantly different behavior from denser alloys or ones with different initial cluster distributions.

关键词： cluster dynamics precipitates precipitation kinetics carbides

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Evolution of ion-irradiated point defect concentration by cluster dynamics simulation

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Chinese Physics B 2021年第5期30卷 69-74页

作者： Shuaishuai Feng Shasha Lv Liang Chen Zhengcao Li Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Beam Technology and Material Modification(MOE) College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China The Department of Engineering Physics Tsinghua UniversityBeijing 100084China

The relationship between ions irradiation and the induced microstructures(point defects,dislocations,clusters,etc.)could be better analyzed and explained by *** mean field rate theory and cluster dynamics are used to simulate the effect of implanted Fe on the point defects concentration *** is found that the depth distribution of point defect concentration is relatively gentle than that of damage calculated by SRIM ***,the damage rate and point defect concentration increase by 1.5 times and 0.6 times from depth of 120 nm to 825 nm,*** the consideration of implanted Fe ions,which effectively act as interstitial atoms at the depth of high ion implantation rate,the vacancy concentration Cv decreases significantly after reaching the peak value,while the interstitial atom concentration Ci increases significantly after decline of the previous *** the peak depth of ion implantation,Cv dropped by 86%,and Ci increased by 6.2 ***,the implanted ions should be considered into the point defects concentration under high dose of heavy ion irradiation,which may help predict the concentration distribution of defect clusters,further analyzing the evolution behavior of solute precipitation.

关键词： ion irradiation point defect concentration cluster dynamics simulation

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Effects of interstitial cluster mobility on dislocation loops evolution under irradiation of austenitic steel

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Nuclear Science and Techniques 2024年第8期35卷 69-78页

作者： Xin‑Hua Yan Lu Sun Du Zhou Teng Xie Chang Peng Ye‑Xin Yang Li Chen Zhen‑Feng Tong North China Electric Power University Beijing 102206China China Nuclear Power Operations Co. LtdShenzhen 518000China

The evolution of dislocation loops in austenitic steels irradiated with Fe^(+)is investigated using cluster dynamics(CD)simulations by developing a CD *** CD predictions are compared with experimental results in the *** number density and average diameter of the dislocation loops obtained from the CD simulations are in good agreement with the experimental data obtained from transmission electron microscopy(TEM)observations of Fe~+-irradiated Solution Annealed 304,Cold Worked 316,and HR3 austenitic steels in the *** CD simulation results demonstrate that the diffusion of in-cascade interstitial clusters plays a major role in the dislocation loop density and dislocation loop growth;in particular,for the HR3 austenitic steel,the CD model has verified the effect of temperature on the density and size of the dislocation loops.

关键词： cluster dynamics Dislocation loops In-cascade interstitial clusters Austenitic steels

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