Electro-Discharge Sintering (EDS) employs a high-voltage/high-current-density pulse of electrical
energy, discharged from a capacitor bank, to instantaneously consolidate powders. In the present study, a single
pulse of 0.57-1.1 kJ/0.45 g-atomized spherical Ti_(52)Zr_(28)Ni_(20) powders in size range of 10~30 and 30~50 μm consisting
of β-(Ti, Zr) and icosahedral phases were applied to examine the structural evolution of icosahedral phase
during EDS. Structural investigation reveals that high electrical input energy facilitates complete decomposition
of icosahedral phase into C14 laves and β-(Ti, Zr) phases. Moreover, critical input energy inducing decomposition
of the icosahedral phase during EDS depends on the size of the powder. Porous Ti and W compacts have been fabricated
by EDS using rectangular and spherical powders upon various input energy at a constant capacitance of
450 μF in order to verify influence of powder shape on microstructure of porous compacts. Besides, generated
heat (ΔH) during EDS, which is measured by an oscilloscope, is closely correlated with powder size.