A Ni-based superalloy (Inconel 718) was successfully processed by high-pressure torsion (HPT) under a pressure up to 6GPa at room temperature. The grain size after the HPT processing was reduced to ~100nm. Tensile testing at 1073K led to the advent of superplasticity with a maximum elongation of 1190% at a strain rate of 2×10-2s-1 which is well in the range of high-strain-rate superplasticity. This superplastic flow was accompanied by a significant decrease in the flow stress.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering