Abnormal texture evolution of accumulative roll bonded Al-Cu by adding alumina particles

Texture evolution in metal composites is a key factor in determining mechanical properties and deformation behavior. Prior research has shown that Accumulative Roll Bonding (ARB) can significantly alter the microstructure and texture of metallic materials. However, the influence of ceramic particle addition on texture development during ARB remains less explored. This gap motivated the investigation of how alumina particles affect the evolution of texture in Al-Cu composites. It was already known that ARB induces shear deformation and grain refinement, but the role of alumina in this process is not well established. Researchers have also noted that texture development varies between different phases in a composite. This study aimed to clarify the specific impact of alumina particles on the textural changes in both Al and Cu components. The study builds on previous findings about shear band formation and grain boundary evolution during severe plastic deformation. No prior work had resolved the exact contribution of alumina particles to texture evolution in Al-Cu composites. This research fills that knowledge gap by combining XRD and microscopy techniques.

The study aimed to investigate how the addition of alumina particles affects the texture evolution in Al-Cu composites during ARB. Researchers focused on the microstructural and textural changes in both the Al and Cu phases. The motivation for this study was to understand the role of alumina particles in modifying the deformation behavior of the composite. The specific problem addressed was the lack of understanding about how ceramic particles influence texture development in multi-phase composites. The study sought to determine whether alumina particles contribute to the formation of shear or recrystallized textures. The researchers also wanted to assess the impact of alumina on grain boundary evolution. They hypothesized that alumina particles might influence the formation of localized deformation zones. This study provides insights into the interplay between particle addition and texture evolution in ARB-processed composites.

The researchers used X-Ray Diffraction (XRD) to analyze the texture evolution of the Al-Cu composite. Composite samples were fabricated using the Accumulative Roll Bonding (ARB) process. Alumina particles were uniformly distributed in the composite using an anodizing technique. The ARB process involved cutting, stacking, and rolling the lamellar materials up to seven cycles. Optical and scanning electron microscopy were employed to examine microstructural changes. Researchers focused on shear band formation and grain boundary evolution. They evaluated the orientation of grains in both Al and Cu phases. The study also examined the distribution of high angle grain boundaries in the final ARB cycles. The researchers proposed the existence of a localized particle deformation zone (PDZ) around alumina particles. This approach allowed them to correlate microstructural observations with textural changes.

In early ARB cycles, the Al side developed a shear texture close to the Rotated Cube. This was confirmed by microstructural analysis of shear bands using optical and scanning electron microscopy. The Cu side, in contrast, showed a prominent recrystallized Cube texture in early cycles. At higher ARB cycles, a mixture of rolling and recrystallized textures was observed in the Cu phase. The final two ARB cycles led to a nearly random grain orientation in both Al and Cu. The number of high angle grain boundaries increased in both phases during the last cycles. This increase confirmed the occurrence of grain refinement throughout the ARB process. The study also proposed that the localized PDZ around alumina particles contributed to texture evolution. These findings suggest that alumina particles influence the textural development of the composite. The results highlight the different textural responses of Al and Cu to ARB processing.

The study showed that alumina particles influence the texture evolution of Al-Cu composites during ARB. The Al side developed a shear texture in early cycles, while the Cu side showed a recrystallized Cube texture. At higher ARB cycles, both phases exhibited a nearly random orientation. The increase in high angle grain boundaries confirmed grain refinement in both Al and Cu. The researchers proposed that the localized PDZ around alumina particles contributes to texture changes. These findings suggest that alumina particles affect the deformation behavior of the composite. The study highlights the different textural responses of Al and Cu to ARB processing. The results support the idea that particle addition can modify texture evolution in multi-phase composites. The authors suggest that further research is needed to explore the full impact of alumina on composite deformation. The study provides a foundation for understanding how ceramic particles influence texture in ARB-processed materials.