To prove that the observed electropulsing-induced microstructure
evolution is not only taken place in some local areas but throughout
the sample, electrical conductivity of the sample before and after the
electropulsing treatment was measured using DO5000 series
Microhmmeter. The measured electrical conductivities before and
after electropulsing treatment are 6.37 × 106 S/m and 7.94 × 106 S/m,
respectively. It increases 24.6%. Matthiessen's rule states that the total electrical resistivity of an impure metal includes the temperaturedependent
intrinsic resistivity (ρ0(T)) arising from the scattering of
electrons by lattice waves or phonons and the residual resistivity
(ρR(c)) caused by the scattering of electrons by impurity atoms and lattice
defects which is temperature independent but dependent on the
impurity concentration (c) [31]. This is represented as