ANISOTROPIC DEFECT ACCUMMULATION IN ROLLED ALUMINUM BY EBSD AND XRD

N. DE VINCENTIS; H. BROKMEIER; M. AVALOS; R. BOLMARO; E. BENATTI; F. CRUZ GANDARILLA

Cancun

Congreso; XXVII INTERNATIONAL MATERIALS RESEARCH CONGRESS; 2018

International Material Research Society

 Severe PlasticDeformation (SPD) can generate large microstructural changes in metals andalloys and there is a strong evidence about crystals accumulating energy notonly due to the alloy or deformation process but also in function of theirorientation. However, there are no general rules to explain or calculate thestored energy on SPD materials. The qualitative and quantitative comprehensionof such processes, as well as about the evolution of defect structures, couldallow to predict more precisely the response of different materials subject tovarious deformation and heat treatment processes.We present correlationsbetween EBSD and XRD results obtained in AA1050 Al sheets subject to rolling untilreaching 70 % thickness reduction.XRD experimentswere performed in PETRA-III, DESY synchrotron beam in Hamburg, Germany. Resultswere obtained by collecting 37 complete Debye-Scherrer image plates in transmission geometry with ahighly parallel ~86.3 KeV, 100 µm x 100 µm synchrotron beam. Generalized PoleFigures (GPF) were obtained for defects and later on used to calculateGeneralized Distribution Functions (GDF) by using MTEX toolbox.Electron BackScattering Diffraction (EBSD) scans have been performed to calculate severalmisorientation related parameters, like GOS, GAM, KAM and GND and grain size, Theresults were obtained in a FEG-SEM Quanta 200 FEI equipped with TSL-OIM 7.3acquisition and processing software. Comparison between those two differenttechniques may shed light on the complex mechanisms of further recovery andrecrystalization phenomena.