Role of disclinations around kink bands on deformation behavior in Mg–Zn–Y alloys with a long-period stacking ordered phase

Tokuzumi, Tsubasa; Mitsuhara, Masatoshi; Yamasaki, Shigeto; Inamura, Tomonari; Fujii, Toshiyuki; Nakashima, Hideharu

doi:10.1016/j.actamat.2023.118785

Cited by 31 publications

(2 citation statements)

References 42 publications

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“…According to the RE elements added, these alloys can be referred to as Type I and Type II. Type I corresponds to Mg-(Y, Dy, Ho, Er, Tm)-Zn alloys in which the LPSO-phase is formed during the casting process [5][6][7][8][9][10]. In the case of Mg-(Gd, Tb,.…”

Section: Introductionmentioning

confidence: 99%

Study of Tensile and Compressive Behavior of ECO-Mg97Gd2Zn1 Alloys Containing Long-Period Stacking Ordered Phase with Lamellar Structure

Garcés,

Medina,

Pérez

et al. 2024

Metals

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A suitable heat treatment in the Mg97Gd2Zn1 (at.%) alloy in the as-cast condition results, after extrusion at high temperature, in a two-phase lamellar microstructure consisting of magnesium grains with thin lamellar shape precipitates and long fibers of the 14H-Long-Period Stacking Ordered (LPSO) phase elongated in the extrusion direction. The magnesium matrix is not fully recrystallized and highly oriented coarse non-dynamically recrystallized (non-DRXed) grains (17% volume fraction) elongated along the extrusion direction remain in the material. The deformation mechanisms of the extruded alloy have been studied measuring the evolution of the internal strains during in situ tension and compression tests using synchrotron diffraction radiation. The data demonstrate that the macroscopic yield stress is governed by the activation of the basal slip system in the randomly oriented equiaxed dynamic recrystallized (DRXed) grains. Non-DRXed grains, due to their strong texture, are favored oriented for the activation of tensile twinning. However, the presence of lamellar-shape precipitates strongly delays the propagation of lenticular thin twins through these highly oriented grains and they have no effect on the onset of the plastic deformation. Therefore, the tension–compression asymmetry is low since the plasticity mechanism is independent of the stress mode.

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Section: Introductionmentioning

confidence: 99%

Study of Tensile and Compressive Behavior of ECO-Mg97Gd2Zn1 Alloys Containing Long-Period Stacking Ordered Phase with Lamellar Structure

Garcés,

Medina,

Pérez

et al. 2024

Metals

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show abstract

“…In addition, recent theoretical and experimental studies suggest that kink deformation is closely related to the formation of disclination. 9,10) However, precise stress fields and strain energy of disclinations formed during the kink growth have not been understood.…”

Section: Introductionmentioning

confidence: 99%

Mechanics and Energetics of Kink Deformation Studied by Nonlinear Continuum Mechanics Based on Differential Geometry

et al. 2023

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This study conducts dislocation-based modeling and numerical analysis for kink deformation using the theory of nonlinear continuum mechanics based on differential geometry. The kinematics of the continuum is represented by the reference, intermediate, and current states, which are related to the multiplicative decomposition of the deformation gradient into plasticity and elasticity. The intermediate state is determined by the Cartan first structure equation, whereas the current state is obtained from the stress equilibrium equation. Kink deformation is modeled by a planar array of edge dislocations, and the governing equations are solved numerically using the finite element method. Quantitative verification of the model is conducted by comparing the bending angle at a kink interface and the theoretical prediction given for the tilt grain boundary. We construct two types of ortho-type kink models for several interface lengths to understand the energetics and mechanics of the kink growth process. The present numerical analysis demonstrates the significant stress concentration at the growth front due to the formation of wedge disclination. We also discuss the material strengthening mechanism from elastic strain energy, nonsingular stress fields, and nonlinear elastic interaction between the disclinations.

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Dynamic damage response of sing-crystal NiTi alloys induced by shear localization

Zhang,

Yang,

Yang

et al. 2024

Acta Mech. Sin.

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Role of disclinations around kink bands on deformation behavior in Mg–Zn–Y alloys with a long-period stacking ordered phase

Cited by 31 publications

References 42 publications

Study of Tensile and Compressive Behavior of ECO-Mg97Gd2Zn1 Alloys Containing Long-Period Stacking Ordered Phase with Lamellar Structure

Study of Tensile and Compressive Behavior of ECO-Mg97Gd2Zn1 Alloys Containing Long-Period Stacking Ordered Phase with Lamellar Structure

Mechanics and Energetics of Kink Deformation Studied by Nonlinear Continuum Mechanics Based on Differential Geometry

Dynamic damage response of sing-crystal NiTi alloys induced by shear localization

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