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説明:

The nucleation of extension deformation twins in magnesium is investigated through in-situ transmission electron microscopy (TEM) indentation tests accompanying with load and unload modes. Note that indentation direction is parallel to the [0001] direction (-axis). Based on the results obtained from numerical study, the dog-bone shaped specimen is used i) to avoid friction between the indentation tip and top of the specimen and ii) to control the stress concentration site. Many dislocations on the basal and prismatic planes are activated at the loading state, and twins are never formed even at achieving maximum stress of ~1.4 GPa. On the other hand, the {101 ̅2}-typed deformation twins are nucleated at the unloading state. In-situ observations reveal that the source of twin nucleation is due to the interaction between activated dislocations through slips and residual dislocation, which causes a high stress concentration. Subsequently, these twins grow as the unload indentation progresses.

権利情報:

• In Copyright
  

キーワード: Magnesium, Deformation twins, In-situ observation, Dislocation, Mechanical response

刊行年月日: 2023-11-10

出版者: Elsevier BV

掲載誌:

• Materials Science and Engineering: A (ISSN: 09215093) vol. 890 145895

研究助成金:

• Japan Society for the Promotion of Science 19K05068
• Japan Society for the Promotion of Science 25420765
• Japan Society for the Promotion of Science 22K04747

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4885

公開URL: https://doi.org/10.1016/j.msea.2023.145895

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更新時刻: 2025-11-10 08:30:06 +0900

MDRでの公開時刻: 2025-11-10 08:23:20 +0900