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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.

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• In Copyright
  

Keyword: Magnesium, Deformation twins, In-situ observation, Dislocation, Mechanical response

Date published: 2023-11-10

Publisher: Elsevier BV

Journal:

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

Funding:

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

Manuscript type: Author's version (Accepted manuscript)

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

First published URL: https://doi.org/10.1016/j.msea.2023.145895

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Updated at: 2025-11-10 08:30:06 +0900

Published on MDR: 2025-11-10 08:23:20 +0900