Deformation Behavior of Nanostructured Aluminum Alloys

摘要

In the present study, microstructural characteristics and deformation behavior of as-extruded nanostructured and ultrafine-grained aluminum alloys processed via consolidation of cryomilled powders were reviewed. Cryomilling process is proven to be an effective approach to process large amounts of low-density bulk nanostructured aluminum alloys. The microstructure of supersaturated solid solution with equiaxed grains from 100nm to 300 nm was observed in several as-extruded cryomilled Al alloys. Tensile behavior was characterized by high strength and low strain hardening. The high strength at room temperature was primarily attributed to three types of strengthening: grain size effect, solid solution hardening and Orowan strengthening. Cryomilled Al-Mg alloys processed with properly-added unmilled powders show both high strength and improved ductility.