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Aggregatization of Frenckel Defects in Ni and Intermetallide Ni3Al

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Abstract:

The formation of Frenckel pairs - vacancies and interstitial atoms takes place during external high energetical influence. The accumulation and aggregatization of point defects is noticed only at definite conditions. Vacancies form volume vacancy tetrahedrons and interstitial atoms form segregations. The conditions of the formation of point defects complexes on the basis of Frenckel pairs were studied by the methods of molecular dynamics in the dependence on temperature and intensity of external influence. Their possible role in the process of deformation and fracture of materials under study were evaluated. Comparison analysis of their stability was made for clusters of interstitial atoms. When the cluster had about 130 interstitial atoms, crowdion complexes were energetically profitable.

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Periodical:

Materials Science Forum (Volumes 567-568)

Pages:

165-168

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.567-568.165

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Online since:

December 2007

Authors:

Mikhail D. Starostenkov, Nikolay Medvedev, Olga Pozhidaeva

Keywords:

Aggregate, Atom, Diffusion, Fracture, Interaction, Interstitial Atom, Point Defect

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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