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Документ Structure evolution of tungsten coatings exposed to plasma flows under ITER ELM relevant conditions(Kharkiv Institute of Physics and Technology, 2017) Malykhin, S. V.; Surovitskiy, S. V.; Makhlaj, V. A.; Aksenov, N. N.; Byrka, O. V.; Borisova, S. S.; Herashchenko, S. S.; Reshetnyak, V. V.Structure, substructure and stress parameters both on the surface and distributed by depth in the tungsten/steel coatings exposed to high energy hydrogen plasma fluxes were studied by X-ray diffraction methods. The hydrogen plasma exposure results in the following recrystallization processes in the thin surface layer of the coating: appearing the texture axis normal to the surface; increasing the coherence length from 60 nm in the initial state to 80 nm after the plasma exposure; completely annealed micro-strains; and dislocation density lowered twice in the exposed surface layer all these facts confirm the thermal character of the hydrogen plasma influence.