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- W3209943744 abstract "Due to the lack of independent slip systems and the difficulty in mechanical twinning, D0 19 ordered α 2 -Ti 3 Al phase is known to be of substantial mechanical anisotropy, which partly accounts for the low ductility of two-phase (α 2 +γ) TiAl alloys. However, recent studies have shown that in Al-rich α 2 phase compression deformation twins can be activated, which could be beneficial for the ductility of the alloys. In the present study, for the first time, we have revealed a novel internal twinning mechanism of α 2 phase in a TiAl alloy deformed at high temperature. Three twin generations of a common type {20 2 ¯ 1}< 1 ¯ 014> were revealed: Secondary twins formed within the primary twin, and tertiary twins formed in the secondary twin. It is important to note that this internal twin structure can only be observed in the <2 1 ¯ 1 ¯ 6> direction but not the commonly used <11 2 ¯ 0> direction. The shear plane P of all twin variants is of type {1 2 ¯ 10}. Due to the variation of the twinning elements between the twin variants, the twinning shear is blunted. The interfaces between the twin variants are characterized by high-resolution electron microscopy. Special attention was paid to the structure of the coherent and incoherent twin boundaries. The effect of chemical ordering is discussed. Our results also shed light on the complex twinning mechanisms in hexagonal structures." @default.
- W3209943744 created "2021-11-08" @default.
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- W3209943744 date "2022-01-01" @default.
- W3209943744 modified "2023-09-29" @default.
- W3209943744 title "Characterization of primary, secondary and tertiary {20<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si11.svg><mml:msub><mml:mrow /><mml:mover accent=true><mml:mn>2</mml:mn><mml:mo>¯</mml:mo></mml:mover></mml:msub></mml:math>1}<<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si12.svg><mml:msub><mml:mrow /><mml:mover accent=true><mml:mn>1</mml:mn><mml:mo>¯</mml:mo></mml:mover></mml:msub></mml:math>014> successive internal twins in the D019 ordered …" @default.
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- W3209943744 doi "https://doi.org/10.1016/j.actamat.2021.117391" @default.
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