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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 771, JAN 13 2020.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 16/10997-0 - Processamento mecânico de materiais de grão ultrafino obtidos por deformação plástica severa
• Beneficiário: Andrea Madeira Kliauga
• Modalidade de apoio: Auxílio à Pesquisa - Regular