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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Microstructure, texture and interface integrity in sheets processed by Asymmetric Accumulative Roll-Bonding

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Author(s):
de Godoi, Renan Pereira [1] ; Camilo Magalhaes, Danielle Cristina [1] ; Avalos, Martina [2] ; Eduardo Bolmaro, Raul [2] ; Sordi, Vitor Luiz [1] ; Kliauga, Andrea Madeira [1]
Total Authors: 6
Affiliation:
[1] Fed Univ Sao Carlos UFSCar, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil
[2] FCEIA UNR CONICET, Inst Phys Rosario IFIR, Bv 27 Febrero 210 Bis, S2000EZP, Rosario - Argentina
Total Affiliations: 2
Document type: Journal article
Source: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 771, JAN 13 2020.
Web of Science Citations: 0
Abstract

Accumulative Roll-Bonding (ARB) and Asymmetric Rolling (AR) techniques were combined to produce ultrafine-grained aluminum sheets with the mechanical characteristics of a Severe Plastic Deformation (SPD) process. Temperature and number of bonding cycles were varied to promote grain refinement, texture randomization and high-quality sheet bonding. Finite element simulation for a single pass was performed to clarify the strain distribution differences between symmetric and asymmetric roll -bonding. The microstructure and crystallographic texture were measured by Electron Backscatter Diffraction (EBSD) and X-ray diffraction. Hardness and tensile tests characterized strain distribution and bonding efficiency. A fine grain structure with a mean grain size of 1.0 mu m was achieved at 350 degrees C, whereas a coarser grain structure was obtained at 400 degrees C. The grain size and shape distribution were linked to enhancing the mechanical strength in a transversal direction. During repeated bonding cycles at both temperatures, extra shear in the interfacial region yielded favorable homogeneous strain distribution and a weak shear texture across the sheet. Rotated-cube orientation was the strongest component in both processing temperatures. To increase the interfacial strength, mainly on the last bond interface, an extra 50% reduction step was added. This improved the adhesion in the last bonding interface, and thus enhanced the ductility. These findings helped to provide a basis for determining the processing conditions for aluminum alloys. (AU)

FAPESP's process: 16/10997-0 - Mechanical processing of ultrafine-grained materials produced by severe plastic deformation
Grantee:Andrea Madeira Kliauga
Support Opportunities: Regular Research Grants