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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.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

  © 2024.
  Licensed under the Creative Commons https://creativecommons.org/licenses/by-nc-nd/4.0/.

キーワード: Magnesium alloy, Segregation, Deformation twinning, Damping capacity, First-principles calculation

刊行年月日: 2024-05-20

出版者: Elsevier BV

掲載誌:

• Scripta Materialia (ISSN: 13596462) vol. 249 116173

研究助成金:

• JSPS 22H01762
• JSPS 22K04747
• JST JPMJFR213P

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4669

公開URL: https://doi.org/10.1016/j.scriptamat.2024.116173

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更新時刻: 2024-08-22 13:58:45 +0900

MDRでの公開時刻: 2026-05-21 08:25:09 +0900