Through-the-thickness investigation of grain structure and microhardness of Ni-based and Mg-based laminated composites for dental applications

• Published in: Materials letters 2025-03, Vol.382, Article 137838
• Main Authors: Senqiang, Li, Diakina, Ekaterina, Roshan, Ibrahim, Javid, Reza
• Format: Article
• Language: English
• Subjects: Composite; Deformation; Grain refinement; Hardness; Rolling
• ISSN: 0167-577X
• DOI: 10.1016/j.matlet.2024.137838

•Ni-based and Mg-based composites produced by accumulative roll bonding (ARB) technique.•The grain sizes gradually grew from near-surface regions to near-center regions.•The hardness measurement showed a reduction in measured values from surface to center of composites.•The grain size of Mg was finer in Mg-based composite while the grain size of Ni was finer in Ni-based composite. Nowadays, metal-based composites are utilized in medical applications such as dental implant, oral surgery, and dentistry. This work looks into the evolution of grain structure and hardness of Ni and Mg layers from the surface to the center of Ni-based and Mg-based laminated composites processed by eight cycles of accumulative roll bonding (ARB) technique. The findings showed a gradual decrease in grain size from the surface to the center of composites. Moreover, the lowest grain sizes of Ni and Mg were obtained when they were in the matrix of composites that were closer to rollers. Also, the hardness of layers grew by increasing the cycles. The layers closer to the surface of composites showed higher hardness. Nonetheless, the variations of hardness values were also observed because of the slicing and re-stacking of composites prior to each cycle.