Analysis of Structure and Mechanical Properties of AA 5083 Aluminium Alloy Processed by ECAE

摘要

In order to alight a little more on the understanding of the mechanisms involved in nanostructuration when severe plastic deformation is carried out by ECAP on ductile alloys, different routes have been applied on a AA 5083 alloy at 423K. Metallographic characterisation has been done by means of optical microscopy, scanning and high resolution transmission electron microscopy to investigate size, morphology, and distribution evolution of the metallic matrix and the precipitates present in this type of aluminium alloy. Also, some mechanical properties have been studied using nanoindentation, US measurements and mechanical testing. From the results it is worth noting that the microstructure shows two observation levels. In one case, as expected, micrometric level does follow classical statements and thus properties are related to microstructure evolution, whereas in the nanometric scale these relationships do not seem to agree.