A Molecular Dynamics Study of Helium-Vacancy Clusters Production due to Cascades in α-Iron

Abstract:

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Molecular dynamics (MD) methods are utilized to study the displacement cascades in α-Fe containing different concentrations of substitutional He atoms. Primary knock-on atom (PKA) energies, Ep, from o.5 keV to 20 keV are considered at a temperature of 100 K and 600 K, and the results are compared with those performed in pure α-Fe. There are distinct differences in the number and size of defect clusters within displacement cascades with and without substitutional helium atoms. Particularly, the number and size of helium-vacancy clusters generally increase with increasing helium concentration and PKA energy. However, the number of He-vacancy (He-V) clusters increases with increasing temperature, the mean size of He-V clusters is independent on temperature for the same He concentration and energy recoils.

Info:

Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

1753-1756

DOI:

10.4028/www.scientific.net/MSF.561-565.1753

Citation:

L. Yang et al., "A Molecular Dynamics Study of Helium-Vacancy Clusters Production due to Cascades in α-Iron", Materials Science Forum, Vols. 561-565, pp. 1753-1756, 2007

Online since:

October 2007

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$35.00

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