Low-energy ion bombardment of surface allows healing defects and form nanocrystalline structure in the superficial layer, influences the deformation behavior of the product and increase in its structural strength (combination of high strength and ductility). Material strength is ensured by the defect-free structure inside the grains, and the ductility – by the state of the boundaries with a large number of point defects. The plastic deformation occurs by rotational mechanism, i.e. by sliding and turning of the grains. At that, formation of stress concentrators and associated with it metal embrittlement is impossible.