Abstract
In this study, Al1050 sheets were fabricated in five passes using the accumulative roll bonding (ARB) technique. For a more accurate and complete investigation, different tests were used, including a uniaxial tensile test. The results show that elongation increases about 50% for the annealed sample, which is 2.5 times that of the fifth pass (20%). A five-fold increase can be seen in tensile strength, which was 50 MPa in the annealed sample and reached 250 MPa at the end of the fifth pass. The annealed sample’s yield stress was 40 MPa, 4.5 times less than 180 MPa after five passes of ARB. Then, to evaluate sample hardness, the Vickers microhardness test was conducted in the samples’ depth direction, which recorded 39 HV for the annealed piece and 68 HV after the last ARB pass. These results show that the hardness increases by 1.8 times after five passes of ARB. In the next step, by conducting fractography tests after the sample fractures during the tensile test, the fracture’s mechanism and type were identified and explained. Finally, X-ray diffraction (XRD) was employed to produce pole figures of sample texture, and the anisotropy phenomena of the annealed sample and ARBed samples were wholly examined. In this study, with the help of pole figures, the anisotropic behavior after ARB was investigated and analyzed. In each step of the process, observing the samples’ texture states and the anisotropy magnificent was possible. According to the results, normal anisotropy of 0.6 in the annealed sample and 1.8 achieved after the fifth pass of ARB indicates that ARB leads to an increase in anisotropy.
Highlights
Due to growing inquiries from various industries in specialized fields for different materials with unique properties, researchers have recently paid more attention to research in the area of fine-grained materials [1]
One of the newest methods employed for producing ultrafine grained (UFGed) materials is the severe plastic deformation (SPD) method [3,4,5]
To elevate the sheets’ mechanical and metallurgical properties, they were kept in a thermal furnace at 365 ◦ C for the exact time of 75 min, and cooled at ambient temperature
Summary
Due to growing inquiries from various industries in specialized fields for different materials with unique properties, researchers have recently paid more attention to research in the area of fine-grained materials [1]. One of the newest methods employed for producing ultrafine grained (UFGed) materials is the severe plastic deformation (SPD) method [3,4,5]. The accumulative roll bonding (ARB) process is among the most practical and lowest cost methods for producing UFGed sheets and composites [4,7]. This method involves performing several continuous functions including sheet cutting, degreasing and brushing to clean the sheet surfaces, bonding the sheets by a normal rolling process, and repeating the above steps [8]
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