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• W2040752440 abstract "Deformation twins have been observed in polycrystalline Al-4.8 wt% Mg shock-loaded at −180°C to 13 GPa. Selected area diffraction confirms the twinning plane to be the {111}, similar to deformation twinning in other face-centered cubic (f.c.c.) metals. Transmission electron microscope (TEM) observations indicate that twins form preferentially near grain boundaries. A qualitative estimate of twin boundary velocity based on TEM observations suggests that twins in Al-4.8 wt% Mg form at speeds just below the shear wave velocity. Similarly shock-loaded experiments on 99.99 Al and 6061-T6 exhibited no evidence of deformation twinning. Substructure evolution and twin formation and/or lack of deformation twinning in the three aluminum alloys studied are discussed in terms of deformation twinning mechanisms. Nous avons observé des macles de déformation dans de l'aluminium polycristallin à 4,8% en poids de magnésium, soumis à des chargements par chocs allant jusqu'à 13 GPa, à − 180°C. La diffraction en aire sélectionnée confirme que le plan de macle est de type {111}, comme c'est le cas dans les autres métaux c.f.c. Les observations en microscopie électronique en transmission (MET) montrent que les macles se forment de préférence près des joints de grains. Une estimation qualitative de la vitesse des joints de macle, basée sur les observations en MET, suggère que dans l'alliage Al-Mg étudié, les macles se forment à des vitesses juste inférieures à la vitesse de l'onde de cisaillement. Des expériences de mise en charge par choc réalisées sur de l'aluminium 4N et du T6-6061 n'ont permis de mettre en évidence aucun maclage de déformation. Nous discutons l'évolution de la sous-structure, la formation des macles et/ou l'absence de maclage de déformation dans les trois alliages d'aluminium étudiés, à partir des mécanismes du maclage de déformation. In der polykristallinen Legierung Al-4,8 Gew.-%Mg, die bei − 180°C bis zu 13 GPa impulsbelastet worden war, wurden Verformungszwillinge beobachtet. Die Feinbereichsbeugung bestätigt {111} als Zwillingsebene, entsprechend denjenigen der Verformungszwillinge in anderen kubischflächenzentrierten Metallen. Im Durchstrahlungselektronenmikroskop ergibt sich, daβ die Zwillinge sich vorzugsweise in der Nähe von Korngrenzen bilden. Eine Abschätzung der Geschwindigkeit der Zwillingsgrenze aus den elektronenmikroskopischen Beobachtungen ergibt, daβ die Zwillinge sich in dieser Legierung mit einer Geschwindigkeit bilden, die gerade unterhalb der einer Scherwelle liegt. Ähnliche Impulsexperimente an 99,99 Al und an 6061-T6 ergeben keine Hinweise auf die Bildung von Verformungszwillingen. Anhand der Bildungsmechanismen von Verformungszwillingen werden die Entwicklung der Defektstruktur, die Zwillingsbildung und das Auftreten oder Fehlen von Verformungszwillingen diskutiert." @default.
• W2040752440 created "2016-06-24" @default.
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• W2040752440 date "1988-07-01" @default.
• W2040752440 modified "2023-10-09" @default.
• W2040752440 title "Deformation twinning in Al-4.8 wt% Mg" @default.
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• W2040752440 doi "https://doi.org/10.1016/0001-6160(88)90242-8" @default.
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