  The 3 heating modes are utilized to make ZrN powders have 3 different levels
of the electric current density at the same temperature during spark plasma
sintering (SPS). The constitutive equation of sintering for SPS is applied to
the experimental porosity evolution of ZrN from three SPS modes, and this
showed high electric current density increase the electric current assisted
deformability value of ZrN pellets, resulting in a reduction of the flow
stress. The electric current flow enhances the dislocation motion, which was
experimentally proved and analyzed by modified Williamson-Hall equation
applying to X-ray diffraction results, and the mechanical strength test of ZrN
pellets.
