Textural evolution of commercially pure aluminum in Al/Ni laminated composite produced by severe plastic deformation

7^th Annual Congress on Materials Research and Technology

February 20-21, 2017 Berlin, Germany

Monireh Azimi, Leo Kestens, Mohammad R Toroghinejad and Morteza Shamanian

Ghent University, Belgium
Isfahan University of Technology, Iran

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

In this study, the 4-layer accumulative roll bonding (ARB) process in three consecutive steps was carried out at room temperature to fabricate a bimetallic Al-Ni composites. The ARB process is a severe plastic deformation methods proper to produce layered composites. Al-Ni laminated composites are promising materials for applications such as structural materials in automotive, aerospace and electronics industries addressing market demands of lightweight, corrosion resistance, suitable strength and ductility. The microstructure and texture evolutions of the aluminium matrix were characterized using field emission gun scanning electron microscopy (FEG-SEM) equipped with an electron backscatter diffraction (EBSD) device. The microstructures revealed that applied strain on the composite was partitioned between Al and Ni layers. The partitioning followed isostrain conditions of deformation at cold roll bonding (CRB) step and then became progressively deviated toward isostress condition with increasing the ARB cycles. Texture results indicate that the Al texture was produced by a combination of shear and plane strain compression modes. The mixed texture intensified up to a maximum level and then weakened in third cycle. There was no sign of �?± (<110>//ND) and Ï�? fibers (<110>//TD)) while �?²-rolling fiber became stronger with increasing the process cycles except the third one. The factors leading to texture weakening in the third cycle, were comprehensively evaluated including grain fragmentation, continuous dynamic recrystallization and the presence of nickel fragments. It was realized that nickel fragments substantially influenced on the plastic flow of Al, which induces specific texture evolutions

Biography :

Email: Monireh.Azimi@UGent.be