Androgynous {10-12} twin in zinc
Document type :
Article dans une revue scientifique: Article original
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Title :
Androgynous {10-12} twin in zinc
Author(s) :
Merkel, Sébastien [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Hilairet, Nadege [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Wang, Yanbin [Auteur]
Guignard, Jérémy [Auteur]
Tomé, Carlos N. [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Hilairet, Nadege [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Wang, Yanbin [Auteur]
Guignard, Jérémy [Auteur]
Tomé, Carlos N. [Auteur]
Journal title :
Physical Review Materials
Abbreviated title :
Phys. Rev. Materials
Volume number :
8
Pages :
063603
Publisher :
American Physical Society (APS)
Publication date :
2024-06-10
ISSN :
2475-9953
English abstract : [en]
Under ambient conditions, Zn is a hexagonal metal with a large c/a ratio of 1.856. Plastic deformation is predominantly accommodated by basal ⟨a⟩ slip and compression twins on the {10-12} planes. Increasing hydrostatic ...
Show more >Under ambient conditions, Zn is a hexagonal metal with a large c/a ratio of 1.856. Plastic deformation is predominantly accommodated by basal ⟨a⟩ slip and compression twins on the {10-12} planes. Increasing hydrostatic pressure drastically reduces the c/a ratio of Zn and, when a critical threshold of c/a=√3 at about 10 GPa is crossed, the {10-12} twins are predicted to change from compressive to tensile in nature. What happens at the transition point, when c/a=√3, remains unknown. Here, we strain-cycle a textured polycrystalline sample of pure Zn at uniform hydrostatic pressures ranging between 2 and 17 GPa, over which the c/a ratio crosses the c/a=√3 compressive-tensile transition for {10-12} twins. During deformation, the state of the sample is monitored through x-ray diffraction to extract texture and internal strain evolution. By comparing the experimental results with the predictions of an elastoviscoplastic polycrystal simulation, we confirm the androgynous nature of {10-12} twin response at low and high pressures. When c/a=3, polycrystalline Zn does not display any evidence of twinning and its plastic behavior is controlled by mostly basal and pyramidal ⟨c+a⟩ slip activity, with a very small contribution of prismatic ⟨a⟩ slip. Evidence for the activity of other {10-1n} twinning modes, which have been suggested for Zn under high pressure, are not observed.Show less >
Show more >Under ambient conditions, Zn is a hexagonal metal with a large c/a ratio of 1.856. Plastic deformation is predominantly accommodated by basal ⟨a⟩ slip and compression twins on the {10-12} planes. Increasing hydrostatic pressure drastically reduces the c/a ratio of Zn and, when a critical threshold of c/a=√3 at about 10 GPa is crossed, the {10-12} twins are predicted to change from compressive to tensile in nature. What happens at the transition point, when c/a=√3, remains unknown. Here, we strain-cycle a textured polycrystalline sample of pure Zn at uniform hydrostatic pressures ranging between 2 and 17 GPa, over which the c/a ratio crosses the c/a=√3 compressive-tensile transition for {10-12} twins. During deformation, the state of the sample is monitored through x-ray diffraction to extract texture and internal strain evolution. By comparing the experimental results with the predictions of an elastoviscoplastic polycrystal simulation, we confirm the androgynous nature of {10-12} twin response at low and high pressures. When c/a=3, polycrystalline Zn does not display any evidence of twinning and its plastic behavior is controlled by mostly basal and pyramidal ⟨c+a⟩ slip activity, with a very small contribution of prismatic ⟨a⟩ slip. Evidence for the activity of other {10-1n} twinning modes, which have been suggested for Zn under high pressure, are not observed.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Related reference(s) :
European Project :
Administrative institution(s) :
Université de Lille
CNRS
INRAE
ENSCL
CNRS
INRAE
ENSCL
Collections :
Research team(s) :
Matériaux Terrestres et Planétaires
Submission date :
2024-06-11T06:41:20Z
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