The Effect of Nitrogen Ion Implantation on the Surface Properties of Ti6Al4V Alloy Coated by a Carbon Nanolayer

Table 4

Maximum indentation hardness values of the modified samples and the reference sample.

Sample	REF; (unmodified)	A; (C 20 nm/1⋅10^17 cm^−2)	B; (C 40 nm/1⋅10^17 cm^−2)	C; (C 20 nm/5⋅10^16 cm^−2)	D; (C 40 nm/5⋅10^16 cm^−2)
Maximum indentation hardness (GPa)	5.3	13	12.4	11.2	11.5
Indentation depth (nm)	14	15	15	14.6	19.6