Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands

Hagihara, Koji; Yamasaki, Michiaki; Kawamura, Yoshihito; Nakano, Takayoshi

doi:10.1016/j.msea.2019.138163

Cited by 83 publications

(36 citation statements)

References 35 publications

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“…They extensively investigated the role of the deformation kink on the mechanical properties of various directionally solidified and extruded Mg alloys with LPSO structure and concluded that both the formation stress of the kink band and the hindering effect of the kink bands on the motion of basal dislocation contributed to the strengthening of LPSO alloys. 7) It should be noted that the kink deformation is not a peculiar deformation mode in Mg alloys, which has also been reported in other metals such as Cd 8) and Zn, 9) especially in those with strong plastic anisotropy. 7) Inamura recently analyzed the geometrics of kink bands and suggested that there exists a compatible kink microstructure to annihilate the disclinations inevitably introduced through kink band formation and that this stable kink microstructure contributes to the strengthening of materials.…”

Section: Introductionsupporting

confidence: 55%

“…7) It should be noted that the kink deformation is not a peculiar deformation mode in Mg alloys, which has also been reported in other metals such as Cd 8) and Zn, 9) especially in those with strong plastic anisotropy. 7) Inamura recently analyzed the geometrics of kink bands and suggested that there exists a compatible kink microstructure to annihilate the disclinations inevitably introduced through kink band formation and that this stable kink microstructure contributes to the strengthening of materials. 10) This theory is purely geometric and is applicable to other alloys and materials.…”

Section: Introductionsupporting

confidence: 55%

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Introduction of Mille-Feuille-Like α/β Layered Structure into Ti–Mo Alloy

Emura

2020

Mater. Trans.

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As a trial to realize kink band strengthening in titanium alloys, slight cold rolling followed by aging heat treatment were applied on Ti12 mass% Mo alloys for obtaining mille-feuille-like layered hcp (¡)/bcc (¢) two phase structure. After slight cold rolling at rolling reduction of 5% and subsequent aging heat treatment at 973 K for 180 ks, plate-like ¡ phases were precipitated in the ¢ phase matrix and made an alternately stacked mille-feuille-like ¡/¢ layered structure. These ¡ phases were precipitated on the boundary of {3 3 2}©1 1 3ª ¢ type deformed twins introduced in the ¢ phase matrix during the slight cold rolling. The thin film-like ¡ phase precipitated at a very early stage of aging, and became thicker during aging to produce the mille-feuille-like ¡/¢ layered structure.

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Section: Introductionsupporting

confidence: 55%

Section: Introductionsupporting

confidence: 55%

Introduction of Mille-Feuille-Like α/β Layered Structure into Ti–Mo Alloy

Emura

2020

Mater. Trans.

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“…During extrusion, the LPSO phase is oriented with their basal plane parallel to the extrusion direction. The activation of the basal slip system is forbidden when the material is tested along the extrusion direction, and the LPSO 2 of 13 phase exhibits differences in the mechanical behavior depending on the stress sign and the orientation of the stress [25][26][27]. Under compression along the extrusion direction, the material exhibits the highest yield stress (500-550 MPa).…”

Section: Introductionmentioning

confidence: 99%

“…Under compression along the extrusion direction, the material exhibits the highest yield stress (500-550 MPa). Moreover, the activation of kinking [23][24][25][26][27] and non-basal slip systems [28] induces a high plastic deformation capacity. Under tension along the extrusion direction, the LPSO phase is extremely brittle.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Plastic Behavior in an Extruded Long-Period Ordered Structure Mg90Y6.5Ni3.5 (at.%) Alloy

Garcés¹,

Barea

Stark

et al. 2020

Crystals

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The Mg 90 Y 6.5 Ni 3.5 alloy composed almost completely of the Long-Period-Stacking-Ordered (LPSO) phase has been prepared by casting and extrusion at high temperature. An elongated microstructure is obtained where the LPSO phase with 18R crystal structure is oriented with its basal plane parallel to the extrusion direction. Islands of α-magnesium are located between the LPSO grains. The mechanical properties of the alloy are highly anisotropic and depend on the stress sign as well as the relative orientation between the stress and the extrusion axes. The alloy is stronger when it is compressed along the extrusion direction. Under this configuration, the slip of dislocations in the basal plane is highly limited. However, the activation of kinking induces an increase in the plastic deformation. In the transversal extrusion direction, some grains deform by the activation of basal slip. The difference in the yield stress between the different stress configurations decreases with the increase in the test temperature. The evolution of internal strains obtained during in-situ compressive experiments reveals that tensile twinning is not activated in the LPSO phase.

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“…1622) Kink deformations in LPSO Mg alloys have attracted more attention because the introduction of kink bands by hot extrusion causes substantial kink strengthening. 23,24) This strengthening is expected to be a universal strengthening principle for the mille-feuille structure, which is a generic structure composed of alternately stacked hard and soft layers on the microscopic scale. A geometrical framework for the kink microstructure is necessary to construct a universal theory for the kink strengthening of the mille-feuille structure.…”

Section: Introductionmentioning

confidence: 99%

Rank-1 Connection of Kink Bands Formed by Non-Parallel Shears

Inamura

Shinohara

2020

Mater. Trans.

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The geometry of kink bands with the general shear direction on the unique slip plane was formulated and the connection between two kink bands formed by non-parallel shears on the slip plane was examined using rank-1 connection. For a kink deformation in a metal with a hexagonal lattice, we derived an equation that decomposes the general shear direction into two ©aª basal slips. The rotation axis of the misorientation of kink band moves away rapidly from h0 " 110i to h1 " 210i as the second ©aª basal shear component increased. We proved that any two kink bands formed by non-parallel basal shears can be rank-1 connected to each other. In addition to the wedge disclination, a mixed disclination at the junction of two kink bands formed by non-parallel basal shears was found.

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Strengthening of Mg-based long-period stacking ordered (LPSO) phase with deformation kink bands

Cited by 83 publications

References 35 publications

Introduction of Mille-Feuille-Like α/β Layered Structure into Ti–Mo Alloy

Introduction of Mille-Feuille-Like α/β Layered Structure into Ti–Mo Alloy

Anisotropic Plastic Behavior in an Extruded Long-Period Ordered Structure Mg90Y6.5Ni3.5 (at.%) Alloy

Rank-1 Connection of Kink Bands Formed by Non-Parallel Shears

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