Novosibirsk, Russia, May, 30 – June, 4, 2011

International Conference
"Modern Problems of Applied Mathematics and Mechanics: Theory, Experiment and Applications", devoted to the 90th anniversary of professor Nikolai N. Yanenko

Kryzhevich D.S.   Zolnikov K.P.   Korchuganov A.V.   Psakhie S.G.  

Atomic cascades in vanadium based alloys under radiation loading

Reporter: Kryzhevich D.S.

The structural damage under irradiation problem is under interest from the long-term predictions of changes in mechanical properties of function materials point of view. Primary evidence for the radiation effect is a generation of atomic displacement cascades responsible for radiation-induced structural defects arising, influenced on physical-mechanical properties of materials.
In present work the study of structural defect nucleation and development which arising as a result of atomic cascades in V based alloys under radiation effect is represented. The investigation was carried out on the base of molecular dynamics method with use of multiparticle interatomic potentials calculated in the scope of modified embedded atom method. The V-4Ti-4Cr alloy was considered as a model material. For taking into account of interfaces existed in real materials, as ideal structural crystallites so with grain boundary ones were used. In the calculations special type symmetrical tilled boundaries were used. In order to simulate atomic cascades generation primary knocked atom (PKA) was supplied with the energies in the range of 1-10 kEv.
Structural defects (Fraenkel pairs) began to arise after atomic cascades were generated. Important to note, that the presence of grain boundaries substantially affect the structural material response. At that, the number of stable defects formed late in the relaxation stage depends on the distance of the PKA from the grain boundary: the greater the distance to grain boundary the smaller the number of defects generated in the crystallite, which tends to the defects value in the material with ideal structure. Calculations showed, that for each distance between the PKA and the interface there is a threshold energy value, after which grain boundary became pervious to atomic cascades.
This work was performed in the scope of Integration project SB RAS No.51. 

Abstracts file: abstract.doc
Full text file: KryzhevichDS.pdf

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