Influence of high ion energy irradiation on nanocrystalline  structures and disperse precipitates stability.

Now dispersion strengthened ferritic/martensitic steels are the basic constructional materials for nuclear reactors of 4-th generation and thermonuclear reactors. Additions in their structure of disperse particles of oxides leads to decrease of swelling, to rise in temperature of operation and improvement of mechanical properties. However presence of disperse precipitates inside of a multicomponent matrix leads to occurrence of other problems, such as compatibility of borders  precipitate -  matrix and a role of the given borders in accumulation of helium and hydrogen, stability of this particles at an irradiation. Separately has to considerate the problem of radiation defects fluxes which are redistributed in a material in the process of appearance of irradiation - induced precipitates type Me₂₃С₆, MeX, etc.

Also it is necessary to note a problem specific to thermonuclear reactors, namely, protection of the first wall of a reactor by the coverings interfering accumulation of helium and hydrogen and protecting it from erosion.   

In National Science Centre “Kharkov institute of physics & technology” (Kharkov, Ukraine) the radiation stability of concrete constructional steels and model materials at which will be present disperse precipitates with different crystallography structure are investigated. Versatile researches of such structures after an irradiation high energy metal and gas ions, and also saturation by hydrogen, will allow deciding the problem of nanocrystalline precipitates stability under an irradiation, to their influence on development vacancy and gas voids, and also on stability nanocrystalline coatings during of helium and hydrogen accumulation.      

The model disperse strengthened structures could be created using the ion beam-assisted deposition method. During this process two kinds of metals are deposited with simultaneously gas ion bombardment. These metals have cardinally differing bind energies with interstitial impurities. This way the conditions for   disperse nanoparticles formation in a polycrystalline matrix will be created. The same method could be used for nanocrystalline composites deposition with different crystallography structures.  

Thus, can be created various model structures on which the basic laws of behavior nanoparticles in conditions of bombardment high energy metal and gas ions will be investigated.