Plastic deformation behavior of Mg12YZn with 18R long-period stacking ordered structure

Hagihara, Koji; Yokotani, Naoyuki; Umakoshi, Yukichi

doi:10.1016/j.intermet.2009.07.014

Cited by 459 publications

(256 citation statements)

References 32 publications

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“…Furthermore, many kink deformation bands were seen to be formed in the LPSO phase, as reported previously. 5,6,[16][17][18][19][20][21]25) The dispersion of the LPSO phase seems to increase with increasing average equivalent strain. Figure 6 shows SEM images of the Mg 97 Zn 1 Y 2 alloys extruded at 623 K with varying average meal flow rate.…”

Section: Microstructurementioning

confidence: 97%

“…[5][6][7][8][9][10][11][12][13][14] The LPSO phase-containing Mg alloys that are hot-extruded exhibit high tensile yield strength (>350 MPa) and moderate elongation (>5%) at room temperature, and high tensile yield strength (>300 MPa) at 473 K. [4][5][6][7]15) It was reported previously that the mechanical properties of extruded alloys improved owing to -Mg matrix grain refinement by dynamic recrystallization (DRX), LPSO phase dispersion, and kink-deformation band formation in the LPSO phase. [16][17][18][19][20][21] Meanwhile, feasibility studies of the LPSO phase-containing Mg-Zn-RE alloys have been under way. With these alloys, extrusion is one of the most important large-scale manufacturing method.…”

Section: -7)mentioning

confidence: 99%

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Effect of Extrusion Parameters on Mechanical Properties of Mg97Zn1Y2 Alloys at Room and Elevated Temperatures

et al. 2010

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The effects of alloy extrusion parameters, such as extrusion ratio, temperature, and speed on the mechanical properties at room and elevated temperatures and the microstructure evolution were investigated in the production of high strength Mg-Zn-Y alloys. The alloy used is a Mg 97 Zn 1 Y 2 (at%) which is engineered to acquire a long-period stacking ordered (LPSO) structure phase to increase alloy-strength. The microstructure of the extruded Mg 97 Zn 1 Y 2 alloy consists of hot-worked and dynamically recrystallized (DRXed) -Mg grains that includes a fiber-shaped LPSO phase elongated along the direction of extrusion. Whereas an increase in average equivalent strain promotes the DRX ofMg matrix and the dispersion of the fiber-shaped LPSO phase, an increase in average metal flow rate is conductive to the DRX of -Mg grains, but is not to the dispersion of LPSO phase. The mechanical properties of the extruded Mg-Zn-Y alloys are affected by changes in the area fraction of the DRXed grains and the dispersion of the fiber-shaped LPSO phase. As the extrusion ratio and extrusion speed increase, overall DRX bringing grain growth in its train in the -Mg matrix phase decreases the tensile strength of alloys, but the dispersed fiber-shaped LPSO phase remaining in the DRXed grains region makes good the adverse effect of overall DRX followed by grain growth.

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Section: Microstructurementioning

confidence: 97%

Section: -7)mentioning

confidence: 99%

Effect of Extrusion Parameters on Mechanical Properties of Mg97Zn1Y2 Alloys at Room and Elevated Temperatures

et al. 2010

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“…26) Figure 1(a) shows an optical micrograph of kink bands in a Zn single crystal specimen compressed 20% plastic strain along the ½01 10 direction. The observation direction was parallel to the ½2 1 10 direction.…”

Section: Overview Of the Intragranular Misorientations Duementioning

confidence: 99%

“…While it was recently reported that in the Mg-based LPSO phase DS crystal only basal slip system was predominantly activated compared to the other slip systems in deformation at room temperature. 26,27) Because of this fact, contributions from non-basal slips and twinning to kinking should be limited in the case of this alloy system. Figures 1(f ) and (g) shows an optical micrograph of the surface morphology and the crystal orientation map in the deformed LPSO phase DS crystal.…”

Section: Overview Of the Intragranular Misorientations Duementioning

confidence: 99%

Crystal Plasticity Analysis of Development of Intragranular Misorientations due to Kinking in HCP Single Crystals Subjected to Uniaxial Compressive Loading

et al. 2015

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The mechanism and the effective factors for the development of intragranular misorientations due to kinking is studied by a crystal plasticity finite element method. A single crystal with hexagonal close-packed (HCP) structure in which only basal slip system is activated is used as a model material. To activate basal slip system, the initial crystal orientations are set to be the ones whose basal planes are slightly deviated from the compressive direction. The result shows that basal slip and the development of intragranular misorientations are sometimes localized near the center of the specimen depending on the initial deviation angle, strain hardening rate, and strain rate sensitivity. The mechanism is discussed in terms of the nonuniform stress distribution and lattice rotation. The effect of slight changes in the boundary conditions shows significant effect on the positions of slip localization. In summary, the present numerical results suggest that there are a number of effective factors for the development of the intragranular misorientations due to kinking including initial crystal orientation, material parameters, and boundary conditions.

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“…For clarifying the origin of such excellent properties, extensive studies on the microscopic structure of the Mg alloys have been performed [4][5][6] , and it has been found that a long-period stacking ordered (LPSO) phase is formed in some of the Mg alloys. Until now, four poly types have been reported, that is, 10H, 14H, 18R, and 24R type LPSO structures [7][8][9][10][11][12] (according to the Ramsdell notation 13) ), among which the 18R type LPSO structure is formed in the Mg 85 Zn 6 Y 9 LPSO alloy, the sample investigated in this work.…”

Section: Introductionmentioning

confidence: 99%

In-Plane Positional Fluctuations of Zinc Atoms in Single Crystal Mg85Zn6Y9 Alloy Studied by X-ray Fluorescence Holography

et al. 2017

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We performed X-ray uorescence holography measurements on a single crystal Mg 85 Zn 6 Y 9 alloy, having a synchronized 18R long period stacking ordered structure, and successfully obtained Zn Kα holograms. The reconstruction shows U -shaped atomic images in remarkable contrast to the prediction of an existing model with Zn 6 Y 8 L1 2 clusters. To explain this feature we calculated holograms using a model with positional uctuations, and t the reconstruction to the experimental results. It was found that large rotational uctuations of the clusters can explain the U -shaped images.

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Plastic deformation behavior of Mg12YZn with 18R long-period stacking ordered structure

Cited by 459 publications

References 32 publications

Effect of Extrusion Parameters on Mechanical Properties of Mg<SUB>97</SUB>Zn<SUB>1</SUB>Y<SUB>2</SUB> Alloys at Room and Elevated Temperatures

Effect of Extrusion Parameters on Mechanical Properties of Mg<SUB>97</SUB>Zn<SUB>1</SUB>Y<SUB>2</SUB> Alloys at Room and Elevated Temperatures

Crystal Plasticity Analysis of Development of Intragranular Misorientations due to Kinking in HCP Single Crystals Subjected to Uniaxial Compressive Loading

In-Plane Positional Fluctuations of Zinc Atoms in Single Crystal Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> Alloy Studied by X-ray Fluorescence Holography

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