<p>Creep aging behavior assisted by pulse current of 1420 alloy with different external stress and initial state (3%-predeformation or non-deformation) has been experimentally investigated in this work. The effects of creep aging external stress and initial state on mechanical properties and microstructure are discussed by means of uniaxial tensile tests, transmission electron microscope (TEM), differential scanning calorimeter (DSC) as well as X-ray diffraction (XRD). The results show that pulse current alters the creep mechanism of alloy under low external stress during the creep aging process, transforming it from diffusion creep to dislocation creep, which increases the creep strain effectively. The combination of the introduced pulse current and the applied stress can enable the alloy to reach the peak aging level faster, namely, the yield strength reaches the highest value of 363&#xa0;MPa at external stress of 170&#xa0;MPa assisted by pulse current, but only 311&#xa0;MPa without the pulse current. Meanwhile, the dislocation density of the sample has been enlarged by the pulse current, leading to stronger work hardening. Notably, in predeformed samples, interaction between pulse currents and dislocations introduced by prestretching further promotes the nucleation and growth of the δ' phase, and the pulse current increases the movement velocity and the density of dislocations, resulting in uneven distribution of dislocations, which in turn affects the morphology and distribution of δ′ phase.</p> Graphical abstract