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Three-dimensional nucleation and growth of deformation twins in magnesium.

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Title: Three-dimensional nucleation and growth of deformation twins in magnesium.
Authors: Lee, Sangwon, Pilipchuk, Michael, Yildirim, Can, Greeley, Duncan, Shi, Qianying, Berman, Tracy D., Creuziger, Adam, Rust, Evan, Detlefs, Carsten, Sundararaghavan, Veera, Allison, John E., Bucsek, Ashley
Source: Science. 8/7/2025, Vol. 389 Issue 6760, p632-636. 5p.
Subjects: Nucleation, Microstructure, Thin films, Ellipsoids, X-ray microscopy
Abstract: At two-thirds the weight of aluminum, magnesium alloys have the potential to reduce the fuel consumption of transportation vehicles. These advancements depend on our ability to optimize the desirable versus undesirable effects of deformation twins, which are three-dimensional (3D) microstructural domains that form under mechanical stresses. Previously only characterized through surface or thin-film measurements, we present 3D in situ characterization of deformation twinning inside an embedded grain over mesoscopic fields of view using dark-field x-ray microscopy supported by crystal plasticity finite element analysis. The results revealed the role of triple junctions on twin nucleation and the sequence and irregularity of twin growth and showed that twin-grain junctions, twin-twin junctions, and twin boundaries were the sites of localized dislocation accumulation. Editor's summary: Dark-field x-ray microscopy has revealed the three-dimensional details of deformation twinning inside an embedded grain in a bulk, polycrystalline magnesium-aluminum alloy. Lee et al. studied twinning in these lightweight alloys because twins can both accommodate plastic strain and serve as unwanted crack initiation sites. Under applied stress, twins appeared as irregular ellipsoid shapes. The authors studied preferential growth directions and how twinning relates to dislocation accumulation that precedes crack initiation. —Phil Szuromi [ABSTRACT FROM AUTHOR]
Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Three-dimensional nucleation and growth of deformation twins in magnesium.
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  Data: <searchLink fieldCode="AR" term="%22Lee%2C+Sangwon%22">Lee, Sangwon</searchLink><br /><searchLink fieldCode="AR" term="%22Pilipchuk%2C+Michael%22">Pilipchuk, Michael</searchLink><br /><searchLink fieldCode="AR" term="%22Yildirim%2C+Can%22">Yildirim, Can</searchLink><br /><searchLink fieldCode="AR" term="%22Greeley%2C+Duncan%22">Greeley, Duncan</searchLink><br /><searchLink fieldCode="AR" term="%22Shi%2C+Qianying%22">Shi, Qianying</searchLink><br /><searchLink fieldCode="AR" term="%22Berman%2C+Tracy+D%2E%22">Berman, Tracy D.</searchLink><br /><searchLink fieldCode="AR" term="%22Creuziger%2C+Adam%22">Creuziger, Adam</searchLink><br /><searchLink fieldCode="AR" term="%22Rust%2C+Evan%22">Rust, Evan</searchLink><br /><searchLink fieldCode="AR" term="%22Detlefs%2C+Carsten%22">Detlefs, Carsten</searchLink><br /><searchLink fieldCode="AR" term="%22Sundararaghavan%2C+Veera%22">Sundararaghavan, Veera</searchLink><br /><searchLink fieldCode="AR" term="%22Allison%2C+John+E%2E%22">Allison, John E.</searchLink><br /><searchLink fieldCode="AR" term="%22Bucsek%2C+Ashley%22">Bucsek, Ashley</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science%22">Science</searchLink>. 8/7/2025, Vol. 389 Issue 6760, p632-636. 5p.
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  Data: <searchLink fieldCode="DE" term="%22Nucleation%22">Nucleation</searchLink><br /><searchLink fieldCode="DE" term="%22Microstructure%22">Microstructure</searchLink><br /><searchLink fieldCode="DE" term="%22Thin+films%22">Thin films</searchLink><br /><searchLink fieldCode="DE" term="%22Ellipsoids%22">Ellipsoids</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+microscopy%22">X-ray microscopy</searchLink>
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  Data: At two-thirds the weight of aluminum, magnesium alloys have the potential to reduce the fuel consumption of transportation vehicles. These advancements depend on our ability to optimize the desirable versus undesirable effects of deformation twins, which are three-dimensional (3D) microstructural domains that form under mechanical stresses. Previously only characterized through surface or thin-film measurements, we present 3D in situ characterization of deformation twinning inside an embedded grain over mesoscopic fields of view using dark-field x-ray microscopy supported by crystal plasticity finite element analysis. The results revealed the role of triple junctions on twin nucleation and the sequence and irregularity of twin growth and showed that twin-grain junctions, twin-twin junctions, and twin boundaries were the sites of localized dislocation accumulation. Editor's summary: Dark-field x-ray microscopy has revealed the three-dimensional details of deformation twinning inside an embedded grain in a bulk, polycrystalline magnesium-aluminum alloy. Lee et al. studied twinning in these lightweight alloys because twins can both accommodate plastic strain and serve as unwanted crack initiation sites. Under applied stress, twins appeared as irregular ellipsoid shapes. The authors studied preferential growth directions and how twinning relates to dislocation accumulation that precedes crack initiation. —Phil Szuromi [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1126/science.adv3460
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        Text: English
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      – SubjectFull: Nucleation
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      – SubjectFull: Thin films
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      – SubjectFull: Ellipsoids
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      – SubjectFull: X-ray microscopy
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      – TitleFull: Three-dimensional nucleation and growth of deformation twins in magnesium.
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              Text: 8/7/2025
              Type: published
              Y: 2025
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