Abstract
Accumulative roll-bonding (ARB) is a novel plastic straining process aimed at bonding of similar and dissimilar metal combinations. Moreover, it is used recently to produce ultrafine grain materials and metal matrix reinforced composites to enhance mechanical, electrical, and corrosion resistance properties. This work presents an experimental study of roll bonding and accumulative roll bonding of similar AA3105 aluminum alloy at 300°C with a final thickness of 1.2 mm, focusing especially on bond strength evaluation and layers continuities. Tensile tests and three-points bending were performed to mechanical characterize the produced sheets in the various steps and based on the number of the cycles. The maximum strength was reached after 3 ARB cycles. After 4 cycles, the bonding interfaces have a uniform distribution through the sheet thickness, it is possible to distinguish only the interface formed in the last pass in the fracture surface, and no significant enhancement in strength was observed. Starting from 2 ARB cycles, micro-cracks were observed at the outer surface for bending angles greater than 90 deg, and at 180 deg all ARBed samples except A1 were failed.
Highlights
3xxx aluminum alloys with manganese as a main alloying element are widely used in many applications such as container, packaging, architecture, automobile industry owing to their excellent specific strength, corrosion resistance and formability [1,2,3]
Ultra-fine grains can be obtained by intensive plastic straining, several techniques are available for producing high strains, including equal channel angular press (ECAP), high-pressure torsion (HPT), cyclic extrusion compression (CEC), friction stir processing (FSP), accumulative roll bonding (ARB), or a combination between these techniques [4,5,6,7]
While Maier et al improve the formability and bendability of ARBed Al-6016 by a tailored laser heat treatment [13]. It has been demonstrated by Gashti et al that ARB process on Al-1050, increases microhardness and tensile strength due to work hardening combined with grain refinement, and increases corrosion resistance more than 5.2 times after 9 cycles ARBed sample compared to annealed sample [14]
Summary
3xxx aluminum alloys with manganese as a main alloying element are widely used in many applications such as container, packaging, architecture, automobile industry owing to their excellent specific strength, corrosion resistance and formability [1,2,3]. While Maier et al improve the formability and bendability of ARBed Al-6016 by a tailored laser heat treatment [13] It has been demonstrated by Gashti et al that ARB process on Al-1050, increases microhardness and tensile strength due to work hardening combined with grain refinement, and increases corrosion resistance more than 5.2 times after 9 cycles ARBed sample compared to annealed sample [14]. Xing et al studied the effects of number of ARB cycles on grain refinement and strengthening in ARB processed at 250°C of Al-3003 alloy, showing the increase in tensile strength (after 6 cycles) of about 1.5 times than fully-hardened (H18) 3003 commercially available alloy [17]. The tensile fracture surfaces and the outer bending surfaces after bending at 90° and 180° were investigated and discussed
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