Martensite steel 0.5Cr12Ni2MoMgMn and titanium alloy TiMo1Zr4.5Sn3 were nit
rided by high intensity nitrogen plasma bombardment (current densities were
3.10(16) cm(-2) s(-1) and 1.2.10(17)cm(-2) s(-1) for martensite steel and
titanium alloy correspondingly). Preliminary 30-keV N-2(+) ion implantation
and subsequent plasma treatment essentially increases N penetration depth
two orders of magnitude and surface hardness by a factor similar to3. Appro
ximately the same effect was received also at low energy (300eV) and high i
ntensity Ar+ ion prebombardment and subsequent nitrogen plasma treatment. N
ear the surface a X-ray amorphous layer is created as a result of implantat
ion-plasma treatment. High dose implanted atoms penetration is explained by
their repulsive interaction and diffusion along dislocations.