Abstract
Aluminium alloys are of particular interest because of their low density, low cost and ease of thermo-mechanical processing. During the recent years, much interest has been shown in the development of alloys with optimal mechanical properties which can be retained at high temperatures. The purpose of the present investigation is to study the microstructure of two Al-Mg-Si alloys containing transition elements after cold deformation 10%, 20 %, 30%, 40% and 50% reduction in thickness and annealing at 1 hour at different temperature by using the optical microscopy, transmission electron microscopic (TEM), Vickers hardness measurement. We notice that the micro-hardness increases with the increasing of the deformation level. The coarse particles, with a particle size of about 2 to 3 µm, give rise to a heavily local deformation of the Aluminium matrix. The formation of well-defined substructure due to the arrangement of dislocations is observed after an increase in annealing temperature.
Highlights
Al-Mg-Si alloys (EN AW 6xxx alloys) are structural hardening Aluminium alloys
It has been shown that the addition of transition elements to EN AW 6xxx alloys inhibit recrystallization when the alloys are pre-heated before deformation [8,9,10]
This reduction in microhardness is attributed to the phenomenon of softening of the alloy pushed by the annealing treatment, which makes the increase in the ductility of the cold-rolled Al-Mg-Si alloy
Summary
Al-Mg-Si alloys (EN AW 6xxx alloys) are structural hardening Aluminium alloys. They have notable overall properties with a good aptitude to hot deformation by rolling and cold drawing [1, 2]. The excellent mechanical and electrical properties of these alloys enabled their use in various sectors such as aerospace, automotive and transport of electricity [3,4,5] The transition elements such as zirconium, chromium and manganese, which have low solubility and very slow diffusion rates in the α-Aluminium solid solution, are generally added to EN AW 6xxx alloys to produces fine dispersoid particles. The cold rolling is a process that transforms the metal between two smooth or fluted rolls, rotating in the opposite direction Due to this rotational movement and of the compression generated by the cylinders, there is a continuous reduction in the initial thickness by plastic deformation of the metal [1]. The influence of cold rolling on the precipitation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
