Determination of the primary solidification area of the icosahedral phase in the ternary phase diagram of Zn-Mg-Y

Langsdorf, A.; Ritter, Franz; Aßmus, W.

doi:10.1080/095008397179453

Cited by 79 publications

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“…Based on the phase transformation reactions in Mg-Zn-Y alloys, [36,38] the primary possible phase reactions that correspond to the characteristic points for the two alloys ( Figure 2) have been listed in Table V. This firmly suggests that the Zn/Y ratio was the key factor in controlling the reactions for the I-phase formation.…”

Section: A Influence Of Higher Zn/y Ratio On I-phase Formationmentioning

confidence: 96%

“…[36] The cooling curve indicates that another peak (475.7°C) exists between 440.6°C and 513.5°C for the alloy with a Zn/Y ratio of 5. Also, a transformation reaction should exist between the W-phase and the I-phase at the temperature 475.7°C.…”

Section: A Influence Of Higher Zn/y Ratio On I-phase Formationmentioning

confidence: 98%

“…However, recent studies [15][16][17]20,22] have firmly indicated that Zn/Y ratios (in weight percent) were closely related with phase formation in the Mg-Zn-Y and Mg-Zn-Y-Zr system alloys, as listed in Table I. Through calculating the Zn/Y ratios and analyzing the reactions for the I-phase formation in the Mg-Zn-Y alloys, [36] it can be further confirmed that, to make the I-phase directly form from the melt, the Zn/Y ratio must be larger than 10. Therefore, for the alloy with a Zn/Y ratio of 10, the formation of the I-phase should solely rely on the eutectic reaction of the melt.…”

Section: A Influence Of Higher Zn/y Ratio On I-phase Formationmentioning

confidence: 98%

“…In the research into the ternary phase diagram of Mg-Zn-Y alloys, Langsdorf et al [36] suggested that, when the Y content was lower than 4 at. pct, the I-phase in the Mg 60-3y Zn 40+2y Y y and Mg 50-2y Zn 50+y Y y alloys can directly form from the melt.…”

Section: A Influence Of Higher Zn/y Ratio On I-phase Formationmentioning

confidence: 99%

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Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys

Han

et al. 2009

Metall Mater Trans A

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This work mainly investigated the microstructure and mechanical properties of Mg-Zn-Y-Zr alloys with Zn/Y ratios of 5 and 10. An X-ray diffraction (XRD) analysis indicated that the two alloys were mainly composed of an icosahedral phase (I-phase) and a-Mg matrix. For the alloy with a Zn/Y ratio of 10, however, the diffraction peaks of the I-phase were stronger. Microstructure observation showed that the I-phase preferentially existed in the form of I-phase/a-Mg matrix interdendritic eutectic pockets at grain boundaries. Moreover, when the Zn/Y ratio was increased 2 times, the volume fraction of the I-phase in the a-Mg matrix increased 1.5 times and a tiny Mg 7 Zn 3 phase formed. Energy-dispersive spectroscopy (EDS) mapping and electron probe microanalysis (EPMA) results suggested that the chemical composition of the I-phase was not a constant value. Computer-aided cooling curve analysis (CA-CCA) indicated that, for the alloy with a Zn/Y ratio of 5, formation of the I-phase relied on the W-phase transformation and the eutectic reaction of the residual melt. However, the I-phase formation for the alloy with a Zn/Y ratio of 10 depended on the eutectic reaction of the melt. Tensile tests indicated that the mechanical properties of the two as-cast alloys were poor. After hot extrusion processing, the mechanical properties of the alloy with a Zn/Y ratio of 10 were noticeably increased. The ultimate tensile strength (UTS) and elongation to failure reached 320 MPa and 13 pct, respectively.

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Section: A Influence Of Higher Zn/y Ratio On I-phase Formationmentioning

confidence: 96%

Section: A Influence Of Higher Zn/y Ratio On I-phase Formationmentioning

confidence: 98%

Section: A Influence Of Higher Zn/y Ratio On I-phase Formationmentioning

confidence: 98%

Section: A Influence Of Higher Zn/y Ratio On I-phase Formationmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys

Han

et al. 2009

Metall Mater Trans A

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“…As a strengthening phase, the I-phase particles with high hardness in magnesium alloys with ductile matrix can improve the strength of alloys. In Mg-Zn-Y and MgZn-Zr-Y alloys, I-phase can be formed by peritectic reaction under normal casting condition (Ref [10][11][12]. More and more researches focused on the effect of I-phase on microstructures and mechanical properties (Ref [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 98%

The Effect of Icosahedral Phase on Dynamic Recrystallization Evolution and Hot Workability of Mg-2.0Zn-0.3Zr-0.2Y Alloy

Peng

Zhong

2015

J. of Materi Eng and Perform

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The effect of Icosahedral phase (I-phase) on hot deformation behavior, dynamic recrystallization (DRX) evolution, and hot workability of Mg-2.0Zn-0.3Zr-0.2Y alloy has been investigated in the temperature range of 300-500°C and strain rate range of 0.001-1 s 21 using Gleeble 3500D thermo-mechanical simulator. Based on regression analysis for Arrhenius-type equation of flow behavior, the average activation energy of deformation was determined as Q = 277.8 kJ/mol. The model of DRX evolution is XDRX ¼ 1 À exp½À1:8082ð eÀec e Ã Þ 1:7904 . The DRX model agreed well with the microstructure evolution of the alloy at all deformation conditions. At lower strain rates (0.001-0.01 s 21 ), continuous DRX (CDRX) is the main DRX mechanism that occurred near the original grain boundaries. Twin-dynamic recrystallization (TDRX) began to occur at lower deformation temperatures and higher strain rates (0.1-1 s 21 ). At a deformation temperature range of 250 to 350°C and a strain rate of 1 s 21 , the main DRX mechanism is TDRX, and the density of twins decreased, and CDRX began to occur near the original grain boundaries. When the deformation temperature increased to 400°C, TDRX disappeared and CDRX occurred near original grain boundaries and I-phase particles. According to the flow stress behavior and DRX model, the processing maps have exhibited the optimum deformation conditions to be 450°C and the strain rate range of 0.01-0.001 s 21 .

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Crystal Growth of Large Icosahedral Zn-Mg-Y Single Grains by a Liquid Encapsulated Top Seeded Solution Growth Method

Langsdorf

Aßmus

1999

Cryst. Res. Technol.

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Cryst. Res. Technol. 34 1999 2 261-265In this paper we present our work on the single crystal growth of the icosahedral phase in the system Zn-Mg-Y. Taking into account the results of our previous systematic investigation of the phase diagram Zn-Mg-Y we have been able to grow single grains of the icosahedral phase with a diameter of nearly 1cm. We apply a Liquid Encapsulated Top Seeded Solution Growth method (LE-TSSG) in order to prevent Mg-and Zn-losses during growth.

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Determination of the primary solidification area of the icosahedral phase in the ternary phase diagram of Zn-Mg-Y

Cited by 79 publications

References 0 publications

Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys

Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys

The Effect of Icosahedral Phase on Dynamic Recrystallization Evolution and Hot Workability of Mg-2.0Zn-0.3Zr-0.2Y Alloy

Crystal Growth of Large Icosahedral Zn-Mg-Y Single Grains by a Liquid Encapsulated Top Seeded Solution Growth Method

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