Eventos Anais de eventos
COBEF 2017
Congresso Brasileiro de Engenharia de Fabricação
Microestructural characterization of a asymmetric accumulative roll bonded (AARB) of AA1050 aluminum alloy
Submission Author:
Renan Godoi , SP
Co-Authors:
Felipe Almeida, Andrea Madeira Kliauga
Presenter: Renan Godoi
doi://10.26678/ABCM.COBEF2017.COF2017-1132
Abstract
All severe plastic deformation (SPD) processes induces a very high yield stength, toughness, fatigue life and wear resistance. What distinguishes a particular SPD process from the other is the kind of viscoplastic flow and the deformation path. Thus, those processes that lead to a high level of shear and are characterized by a non-conservative deformation path, will produces a quite random crystallographic distribution and lower anisotropy. Our previous studies have shown that annealing of Al comercial purity (AL 1050), which has been processed by equal channel pressing (ECAP) attains better conformability than the same material processed by conventional rolling or ECAP followed by rolling. However, ECAP is poorly suited for producing plate shaped end products, and accumulative roll bonding (ARB) alone induces the same texture as rolling; hence an alternative can be found in the association of the asymetric rolling technique to the ARB process, here named AARB (accumulative asymetric roll bonding). This technique promotes a high deformation level and a great degree of shear, creating a new method to joint plates. The deformation was performed in a laboratory rolling mill with different diameters of rolls rotating at the same angular speed. The ratio of the roll diameters was 1.5. The starting material was a fully annealed AA1050 aluminium sheet of 2mm thickness, which was asymetric rolled to a initial thickness of 1mm and then annealed at 350°C for 1 hour. AARB was performed stacking two sheets and asymetric rolling to 50% reduction. This procedure was repeated 4 to 6 times with intermediate annealing treatments at 350°C for 5 minutes. The samples were microstructural characterized by metallographic tests to prove the efficiency of bonding. Vickers hardness test was performed to verify the homogeneity of strain.
Keywords
severe plastic deformation, asymetric rolling, Multijunction, severe plastic deformation, asymetric rolling, Multijunction
