Forgeability and Flow Stress of Mg-Zn-Y Alloys with Long Period Stacking Ordered Structure at Elevated Temperatures

Matsumoto, Ryo; Yamasaki, Michiaki; Otsu, Masaaki; Kawamura, Yoshihito

doi:10.2320/matertrans.mra2008255

Cited by 28 publications

(8 citation statements)

References 19 publications

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“…It has been suggested that kink deformations in the LPSO phase and microstructural refinement in the α-Mg phase occur during extrusion deformation [7]. The tensile yield strength, microstructure, fatigue properties, and thermal sta-bility of extruded Mg 96 Zn 2 Y 2 and LPSO-type Mg alloy have been reported [8][9][10]. Enhancements in the strength of Mg 96 Zn 2 Y 2 alloy by means of extrusion have been investigated and reported by Kawamura et al [6][7].…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability and Mechanical Properties of Extruded Mg-Zn-Y Alloys with a Long-Period Stacking Order Phase and Plastic Deformation

Noda¹,

Kawamura²,

Mayama³

et al. 2012

New Features on Magnesium Alloys

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Section: Introductionmentioning

confidence: 99%

Thermal Stability and Mechanical Properties of Extruded Mg-Zn-Y Alloys with a Long-Period Stacking Order Phase and Plastic Deformation

Noda¹,

Kawamura²,

Mayama³

et al. 2012

New Features on Magnesium Alloys

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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: 99%

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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“…where i β is a coupling constant reflecting the strength of the response of walker i to a lateral force. Data on the natural stepping frequency of humans show that the frequencies of a typical group of humans is, on average, peaked at about 1 Hz, with a spread of the order of 0.1 Hz [13]. This average stepping frequency is slightly below the resonant frequency of the lowest order lateral mode of the north span of the Millennium Bridge.…”

Section: Reduced Modelmentioning

confidence: 93%

Low dimensional description of pedestrian-induced oscillation of the Millennium Bridge

Abdulrehem

Ott

2009

Chaos: An Interdisciplinary Journal of Nonlinear Science

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When it opened to pedestrian traffic in the year 2000, London's Millennium Bridge exhibited an unwanted, large side-to-side oscillation, which was apparently due to a resonance between the stepping frequency of walkers and one of the bridge modes. Models for this event, and similar events on other bridges, have been proposed. The model most directly addressing the synchronization mechanism of individual walkers and the resulting global response of the bridge-pedestrian system is the one developed by Eckhardt et al. [Phys. Rev. E 75, 021110 (2007)]. This model treats individual walkers with a phase oscillator description and is inherently high dimensional with system dimensionality (N+2), where N is the number of walkers. In the present work we use a method proposed by Ott and Antonsen [Chaos 18, 037113 (2008)] to reduce the model of Eckhardt et al. to a low dimensional dynamical system, and we employ this reduced description to study the global dynamics of the bridge/pedestrian interaction. More generally, this treatment serves as an interesting example of the possibility of low dimensional macroscopic behavior in large systems of coupled oscillators.

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Forgeability and Flow Stress of Mg-Zn-Y Alloys with Long Period Stacking Ordered Structure at Elevated Temperatures

Cited by 28 publications

References 19 publications

Thermal Stability and Mechanical Properties of Extruded Mg-Zn-Y Alloys with a Long-Period Stacking Order Phase and Plastic Deformation

Thermal Stability and Mechanical Properties of Extruded Mg-Zn-Y Alloys with a Long-Period Stacking Order Phase and Plastic Deformation

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

Low dimensional description of pedestrian-induced oscillation of the Millennium Bridge

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