Control of twin boundary mobility by solute segregation in Mg binary alloys

Hidetoshi Somekawa; Tomohito Tsuru; Kimiyoshi Naito; Alok Singh

doi:10.1016/j.scriptamat.2024.116173

Journal article Control of twin boundary mobility by solute segregation in Mg binary alloys

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Hidetoshi Somekawa, Tomohito Tsuru, Kimiyoshi Naito, Alok Singh. Control of twin boundary mobility by solute segregation in Mg binary alloys. Scripta Materialia. 2024, 249 (), 116173. https://doi.org/10.1016/j.scriptamat.2024.116173

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Static annealing process of 423 K for 2.5 hours is enough to segregate alloying elements at {10-12} twin boundaries in Mg binary alloys. These segregated twin boundaries play a role in obstruction of dislocation slips; thus, they contribute to increase in hardness. The results obtained from internal friction tests reveal that, irrespective of solute elements, induced twin boundaries are effective in enhancing damping capacity, owing to twin boundary reversible motion, i.e., growth and shrinkage. In contrast, in comparison of the loss factor of specimen with/without twin boundary segregation, segregation leads to a decrease in damping capacity. The solute element also affects the difference in damping properties with/without twin boundary segregation. The energy barrier required to occur twin boundary sliding for each solute atom is computed to consider energetical kinetic using first-principles calculations. Energy barrier that is influenced by solute atom is closely related to loss factor. When solute element having a characteristic of high (or low) energy barrier exists at twin boundaries, such an alloying element prevents (or enhances) the occurrence of twin boundary motion. As a result, the binary alloy shows low (or high) loss factor, respectively, in damping tests.

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