Hardness test of the wire and FAB was done with a Fischerscope H100C Vickers microhardness tester using a minimum
test load of 10 mN (1 gram) to 50 mN for 20 μm and 300 mN for 80 μm wire. Hardness value was determined by
measuring the indentation’s diagonal lengths in the SEM and uses the average length of the two diagonals to calculate the
Vickers hardness value according to the following equation:-
HV = F/A ≈ (0.1891F)/d2