Revista Digital Universitaria ISSN: 1607 - 6079 | Publicación mensual | 1 de septiembre de 2015 vol.16, No.9
ABSTRACT
The production of bulk nanostructured metals by severe plastic deformation (SPD) has gained much interest in recent years because of the capability to produce very fine microstructures using a top-down approach, which results in materials that are free from porosity and impurities. Aluminum is a good application of SPD because it is easy to process a wide range of alloys. In this study, Al alloys containing different contents of Fe were processed by High-Pressure Torsion (HPT), which is the most popular technique of SPD. The grain size of the Al matrix was refined down to ~130 nm and the secondary phases were partially dissolved and fragmented into particles with a size well below 1 μm. Hence, the Al-2 wt%Fe alloy is significantly strengthened from the as-cast condition with reasonable ductility, which results in superior mechanical properties when compared to high strength commercial Al alloys. The high strength results from the effect of the ultrafine-grained Al matrix as well as finely dispersed particles. Additional strengthening was achieved when artificial aging was carried out at 200 °C due to precipitation nano-sized coherent and semi-coherent Al6Fe and Al3Fe particles in the peak-aged condition.
Keywords: nanostructure, aluminum alloys, grain refinement, high-pressure torsion, high strength, age-hardening
Development of Nanostructured Aluminum Alloys by Severe Plastic Deformation with Well-Enhanced Mechanical Properties
Jorge Mauricio Cubero SesinKeywords: nanostructure, aluminum alloys, grain refinement, high-pressure torsion, high strength, age-hardening