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<p>Nanostructured materials and ultrafine-grained (UFG) structures have garnered significant attention across diverse industries due to their distinctive characteristics. These materials exhibit high strength, elevated fracture toughness, favorable damping properties, and acceptable ductility. Accumulative roll bonding (ARB) is recognized as one of the most effective severe plastic deformation techniques for fabricating UFG materials. Aluminum alloy 1050 (AA1050), being one of the most versatile metals employed in various industries, necessitates improvements in its mechanical properties. In this study, multilayer AA1050 sheets underwent processing through 2 and 4 ARB cycles, with three repeatability tests conducted for each sample. The fracture properties of double-edge notched tensile (DENT) aluminum sheets fabricated through the ARB process were characterized using the essential work of fracture (EWF) method. For EWF analysis, a series of tensile tests were performed on the ARB-processed samples at different ligament lengths of 5, 7, 9, 11, and 13 mm. The results demonstrated a consistent trend in the force–displacement curves for different ARB cycles and ligament lengths, indicating an increase in the tensile strength with an augmentation in the number of ARB cycles and ligament length. The maximum EWF was observed in samples subjected to four ARB cycles and 13 ligament lengths. Moreover, the findings revealed that an increase in ligament length correlated with heightened total work of fracture, total yielding work, and elongation at break. Conversely, an increase in the number of ARB cycles resulted in an increase in total yielding work and, conversely, a decrease in elongation at break, crack tip opening displacement (CTOD), and crack tip opening angle (CTOA). Field emission scanning electron microscope (FE-SEM) analysis was also conducted to examine fracture mechanisms. The FE-SEM fractographs illustrated a transition from ductile to brittle fracture features with an increase in ARB cycles, leading to the formation of smaller microvoids and shallower dimples.</p>

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Essential Work of Fracture Analysis of Multilayered AA1050 Sheets Processed by Accumulative Roll Bonding

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Seyed-Ali Bineshtarigh,
  • Ahmad Ghasemi-Ghalebahman,
  • Jaber Mirzaei

摘要

Nanostructured materials and ultrafine-grained (UFG) structures have garnered significant attention across diverse industries due to their distinctive characteristics. These materials exhibit high strength, elevated fracture toughness, favorable damping properties, and acceptable ductility. Accumulative roll bonding (ARB) is recognized as one of the most effective severe plastic deformation techniques for fabricating UFG materials. Aluminum alloy 1050 (AA1050), being one of the most versatile metals employed in various industries, necessitates improvements in its mechanical properties. In this study, multilayer AA1050 sheets underwent processing through 2 and 4 ARB cycles, with three repeatability tests conducted for each sample. The fracture properties of double-edge notched tensile (DENT) aluminum sheets fabricated through the ARB process were characterized using the essential work of fracture (EWF) method. For EWF analysis, a series of tensile tests were performed on the ARB-processed samples at different ligament lengths of 5, 7, 9, 11, and 13 mm. The results demonstrated a consistent trend in the force–displacement curves for different ARB cycles and ligament lengths, indicating an increase in the tensile strength with an augmentation in the number of ARB cycles and ligament length. The maximum EWF was observed in samples subjected to four ARB cycles and 13 ligament lengths. Moreover, the findings revealed that an increase in ligament length correlated with heightened total work of fracture, total yielding work, and elongation at break. Conversely, an increase in the number of ARB cycles resulted in an increase in total yielding work and, conversely, a decrease in elongation at break, crack tip opening displacement (CTOD), and crack tip opening angle (CTOA). Field emission scanning electron microscope (FE-SEM) analysis was also conducted to examine fracture mechanisms. The FE-SEM fractographs illustrated a transition from ductile to brittle fracture features with an increase in ARB cycles, leading to the formation of smaller microvoids and shallower dimples.