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

doi:10.1088/1674-1056/26/12/126601

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 (PdT_0.6, ErT₂, NbT_0.0225, VT_0.5, TaT_0.097, TiT_1.5, ZrT_1.6) 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.

Keywords: atomistic modeling diffusion growth metal tritides nucleation and growth helium bubble

Received: 19 June 2017
Revised: 13 September 2017
Accepted manuscript online:

PACS:	66.30.J-	(Diffusion of impurities ?)
	61.72.-y	(Defects and impurities in crystals; microstructure)

Fund: 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).

Corresponding Authors: Xi-Jing Ning
E-mail: xjning@fudan.edu.cn

Cite this article:

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) A diffusion model for solute atoms diffusing and aggregating in nuclear structural materials 2017 Chin. Phys. B 26 126601

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

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