Strengthening of αMg and long-period stacking ordered phases in a Mg-Zn-Y alloy by hot-extrusion with low extrusion ratio

Harjo, Stefanus; Gong, Wu; Aizawa, Katsuo; Kawasaki, Takuro; YAMASAKI, Michiaki

doi:10.1016/j.actamat.2023.119029

Cited by 24 publications

(4 citation statements)

References 65 publications

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“…The IPF were obtained from the Rietveld-texture analysis [32,33], assuming a fiber texture, using the twelfth-order spherical harmonic function implemented in the MAUD software, v. 2.78 [34]. The values of multiple random distributions (mrd) are large near the [10.0] pole, displaying that a typical basal texture with the c-axis orthogonal to the extrusion direction [12,19,26,35,36] was developed. The condition of the IPF, in which the mrd values are large near the [10.0] pole, is kept even at the applied true strain value of 16.4%, i.e., the change in texture is small.…”

Section: Responses Of [Hkl] Orientationsmentioning

confidence: 99%

“…X-ray diffraction with the sin 2 ψ method [6] as well as the triaxial-stress method [6] are widely used to measure the residual stresses on the surface of engineering parts [7,8]. Neutron diffraction [9] is used to measure the residual stresses at the inside region of engineering parts [10] and also the evolutions of stresses in situ during deformation [11,12]. Diffraction occurs on multiple (hkl) lattice planes within the crystal, and the stress measurement is performed based on a change in the spacing of the (hkl) lattice plane from the stress-free state.…”

Section: Introductionmentioning

confidence: 99%

“…When multiple peaks are measured simultaneously using neutron diffraction with the time-of-flight method, the average lattice constants refined from the analyses using the Rietveld or Pawley methods [15,16] are also used for the stress evaluation. For Mg alloys having an HCP structure, the changes in the [hk.l] stress with respect to the external forces vary drastically when yielding occurs; some of their slopes changed to the opposite signs [12,[17][18][19]. Therefore, we need to clarify whether the similar methods for FCC-and BCC-structured materials can be used or not.…”

Section: Introductionmentioning

confidence: 99%

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Stress Evaluation Method by Neutron Diffraction for HCP-Structured Magnesium Alloy

Harjo,

Gong,

Kawasaki

2023

QuBS

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Tensile deformation in situ neutron diffraction of an extruded AZ31 alloy was performed to validate conventional procedures and to develop new procedures for stress evaluation from lattice strains by diffraction measurements of HCP-structured magnesium alloys. Increases in the lattice strains with respect to the applied true stress after yielding largely vary among [hk.l] grains. Some [hk.l] grains have little or no increase in lattice strain, making it difficult to use the conventional procedures to determine the average phase strain by using lattice constants or by averaging several lattice strains. The newly proposed procedure of stress evaluation from the lattice strains shows very high accuracy and reliability by weighting the volume fraction of [hk.l] grains and evaluating them in many [hk.l] orientations in addition to multiplication by the diffraction elastic constant. When multiple hk.l peaks cannot be obtained simultaneously, we recommend to use the 12.1 peak for stress evaluation. The lattice strain value evaluated from the 12.1 peak shows a good linear relationship with the applied true stress for the whole deformation region.

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Section: Responses Of [Hkl] Orientationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stress Evaluation Method by Neutron Diffraction for HCP-Structured Magnesium Alloy

Harjo,

Gong,

Kawasaki

2023

QuBS

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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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Research Progress on the Texture of Electrolytic Copper Foils

Hu,

Fan,

et al. 2024

J. Electron. Mater.

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Strengthening of αMg and long-period stacking ordered phases in a Mg-Zn-Y alloy by hot-extrusion with low extrusion ratio

Cited by 24 publications

References 65 publications

Stress Evaluation Method by Neutron Diffraction for HCP-Structured Magnesium Alloy

Stress Evaluation Method by Neutron Diffraction for HCP-Structured Magnesium Alloy

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

Research Progress on the Texture of Electrolytic Copper Foils

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