High-pressure sliding (HPS) is a new severe plastic deformation process for sheet samples under high-pressure. In this study, the HPS process is applied to an age-hardenable 7075 aluminum alloy for grain refinement. HPS was conducted under a pressure of 1.0. GPa for sliding distances of 7.0. mm at room temperature and for 10. mm at 373. K and 423. K, and thus the average grain size was reduced to ~280. nm, ~240. nm and ~250. nm. Ultimate tensile strength of ~600. MPa was achieved by this grain refinement. Aging at 373. K led to further hardening to 745. MPa of ultimate tensile strength with 4% of elongation to fracture through a fine dispersion of precipitates. It is shown that simultaneous strengthening due to grain refinement and fine precipitation is achieved in the AA7075 by application of HPS and subsequent aging.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering