中国物理B ›› 2017, Vol. 26 ›› Issue (12): 126601-126601.doi: 10.1088/1674-1056/26/12/126601

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

A diffusion model for solute atoms diffusing and aggregating in nuclear structural materials

Quan Song(宋泉), Fan-Xin Meng(孟繁新), Bo-Yuan Ning(宁博元), Jun Zhuang(庄军), Xi-Jing Ning(宁西京)   

  1. 1. Institute of Modern Physics, Fudan University, Shanghai 200433, China;
    2. Applied Ion Beam Physics Laboratory, Fudan University, Shanghai 200433, China;
    3. China ZhenHua Group YongGuang Electronics Co., Ltd. (State-owned 873 Factory), Guiyang 550018, China;
    4. Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
  • 收稿日期:2017-06-19 修回日期:2017-09-13 出版日期:2017-12-05 发布日期:2017-12-05
  • 通讯作者: Xi-Jing Ning E-mail:xjning@fudan.edu.cn
  • 基金资助:
    Project supported by the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20130071110018) and the National Natural Science Foundation of China (Grant No. 11274073).

A diffusion model for solute atoms diffusing and aggregating in nuclear structural materials

Quan Song(宋泉)1,2, Fan-Xin Meng(孟繁新)3, Bo-Yuan Ning(宁博元)4, Jun Zhuang(庄军)4, Xi-Jing Ning(宁西京)1,2   

  1. 1. Institute of Modern Physics, Fudan University, Shanghai 200433, China;
    2. Applied Ion Beam Physics Laboratory, Fudan University, Shanghai 200433, China;
    3. China ZhenHua Group YongGuang Electronics Co., Ltd. (State-owned 873 Factory), Guiyang 550018, China;
    4. Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
  • Received:2017-06-19 Revised:2017-09-13 Online:2017-12-05 Published:2017-12-05
  • Contact: Xi-Jing Ning E-mail:xjning@fudan.edu.cn
  • Supported by:
    Project supported by the Specialized Research Fund for the Doctoral Program of Higher Education, China (Grant No. 20130071110018) and the National Natural Science Foundation of China (Grant No. 11274073).

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摘要： In nuclear structural materials, the nuclear irradiations induce the precipitations of soluble elements or produce the insoluble elements such as He atoms that may form clusters, heavily shortening the service life-times of the materials. In the present work, a diffusion model is developed to predict where and how fast the solute atoms (either soluble or insoluble) aggregate, and this model is applied to the study of the formation and growth of He bubbles in metal tritides (PdT0.6, ErT2, NbT0.0225, VT0.5, TaT0.097, TiT1.5, ZrT1.6) within one thousand days. The results are in good agreement with the available experimental observations and suggest that searching for metals with a barrier of more than 1.1 eV for a single He atom diffusion and making more defects in metal tritides can significantly reduce the growth of He bubbles and extend the service time of the metals.

关键词: atomistic modeling, diffusion growth, metal tritides, nucleation and growth, helium bubble

Abstract: In nuclear structural materials, the nuclear irradiations induce the precipitations of soluble elements or produce the insoluble elements such as He atoms that may form clusters, heavily shortening the service life-times of the materials. In the present work, a diffusion model is developed to predict where and how fast the solute atoms (either soluble or insoluble) aggregate, and this model is applied to the study of the formation and growth of He bubbles in metal tritides (PdT0.6, ErT2, NbT0.0225, VT0.5, TaT0.097, TiT1.5, ZrT1.6) within one thousand days. The results are in good agreement with the available experimental observations and suggest that searching for metals with a barrier of more than 1.1 eV for a single He atom diffusion and making more defects in metal tritides can significantly reduce the growth of He bubbles and extend the service time of the metals.

Key words: atomistic modeling, diffusion growth, metal tritides, nucleation and growth, helium bubble

中图分类号:  (Diffusion of impurities ?)

  • 66.30.J-
61.72.-y (Defects and impurities in crystals; microstructure)