Study on superplastic behaviour of cold rolled Inconel 718 alloy with δ phase dispersion distribution

Cold-rolled Inconel 718 with δ phase dispersion distribution was prepared and exhibited excellent superplasticity at 950°C a strain rate of 6 × 10−4 ~4 10−3 s−1. The elongation to failure 561% obtained 1 Superplastic deformation accelerates the recrystallization cold-rolled deformed microstructure, thus improving grain uniformity. dispersed promotes nucleation recrystallized grains pin boundaries limit size. Diffusion-coordinated boundary slip is main mechanism alloy sheet during superplastic stretching. dense dislocations in act as channel atomic diffusion early stage. Subsequently, material conversion between diffusion. present results have certain reference significance for preparing forming alloy.