Despite the fact that the coatings have shown superior hardness compared to their substrates, no significant change in the
tensile properties as an effect of coatings were observed. This is understood to be due to the fact that the overall elastic modulus
is not largely influenced by the additional hard surface film because of the extremely thin coating layer as compared
with the dimensions of the substrate (an additional 0.15–0.2 mm2 in cross sectional area due to the thin coating); the same
can be said for the yield strength