In this study, the multi-pass high-pressure sliding (MP-HPS) process was applied for grain refinement of rods with an upsized dimension. To achieve a homogeneous microstructure throughout the cross section of the rod, the rod samples are rotated with 60° around the longitudinal axis (MP-HPS-R) or are shifted upward and downward from the mid-height on the cross-sectional plane (MP-HPS-S). A homogeneous microstructure with an average grain size of ~ 200 nm for an Al-3 wt%Mg-0.2 wt%Sc alloy and ~ 160 nm for Inconel 718 were developed through both of the MP-HPS processes. The rods of the Al-3 wt%Mg-0.2 wt%Sc alloy and Inconel 718 after MP-HPS processing exhibited superplasticity with total elongations more than 600% and 400%, respectively. A finite-element method (FEM) was used to simulate the magnitude of the strain including its distribution on the cross section of the rod through processing by MP-HPS-R. It was demonstrated that microstructural homogeneity was developed in the rod processed by the MP-HPS-R but inhomogeneity was left by the MP-HPS-S.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering