In-situ TEM observation of -axis extension twin formation at grain boundaries

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-01-29 DOI:10.1016/j.scriptamat.2025.116575

Hidetoshi Somekawa , Yuka Hara , Taku Moronaga , Alok Singh , Takahito Ohmura

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Abstract

Effect of grain boundaries on {

10 \bar{1} 2

} twin formation and its mechanical response in Mg is investigated through in-situ TEM compression test. Compression direction is set to be normal to the <c>-axis, which is a favorable orientation to form {

10 \bar{1} 2

} twins. In case of a single crystal,

{10 \overline{1} 2}

twins form in the vicinity of the contact region of compression-tip with the specimen, as reported in previous studies. On the contrary, when the specimen has a grain boundary, this interfacial defect becomes the nucleation/formation site for twins. Stress required to form the twins is lower than that in a single crystal. Grain boundaries, which have a role in prevention of dislocation slips, create high stress fields; as a result, they lead to nucleation of a twin embryo. While twin nucleation is a probabilistic event, stress required to form the twins shows size effect.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.