Abstract

In this article, Accumulative Roll Bonding (ARB) of AA 1050/AZ31B/AA 1050 sheets was performed up to the third pass and the fracture toughness for the different passes was experimentally studied for the first time. The mechanical properties, fracture behavior, and microstructure were determined through the tensile test, micro-hardness, plane stress fracture toughness, Optical Microscopy (OM), and Scanning Electron Microscopy (SEM). Due to the importance of the penetration layer depth of the ARBed samples, the effect of annealing temperature on the penetration layer depth was carried out at three annealing temperatures of 200°, 300°, and 400°. The results of the Scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy (SEM-EDX) test showed that increasing the annealing temperature for the rolled sample of pass 1-3 increases the penetration depth. The fracture toughness of the ARBed samples was improved as the ARBed pass number was increased (e.g., the fracture toughness of the third pass was 32% more than the first pass). This improvement was observed for the ARBed samples compared to the base sheets (e.g., the fracture toughness of the 3^rd-pass ARBed sample was 51% and 111% more than aluminum and Mg base sheets, respectively).

Keywords:AA1050/Mg AZ31B sheets; Accumulative Roll Bonding (ARB); Fracture toughness; Annealing temperature effect; Mechanical properties