The 18R and 14H long-period stacking ordered structures in Mg–Y–Zn alloys

Zhu, Yuman; Morton, A. J.; Nie, Jian Feng

doi:10.1016/j.actamat.2010.01.022

Cited by 592 publications

(298 citation statements)

References 28 publications

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“…The Mg-Zn-RE alloys are composed of anMg matrix phase and a long-period stacking ordered (LPSO) structure phase. [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.…”

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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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: -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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“…Upon treatment of the solute at 813 K, some studies show that the RE and Zn atoms in the Mg 24 (RE,Zn) 5 and (Mg,Zn) 3 RE phases diffuse into the matrix whereas the Mg 12 ZnRE phase remains as a gray block phase because that the LPSO phase is relatively stable at high temperatures. 12,13) As can be seen from the Fig. 1, alloy II remained the state of the solution after heat treatment, and the second phase is spread to the matrix, forming a supersaturated solid solution, Mg matrix is greatly increased, and fine particles were dispersed randomly inside the grains.…”

Section: Microstructures Of As-cast Alloysmentioning

confidence: 82%

“…Therefore the secondary phases influence the damping capacity and contribute to damping properties. There are three kinds of ternary equilibrium MgZnY phases, the I-phase (Mg 3 Zn 6 Y, quasi-crystal structure), the W-phase (Mg 3 Zn 3 Y 2 , face-centered cubic structure) and the X-phase (Mg 12 ZnY, long-period stacking ordered (LPSO) structure) existing in MgZnYZr alloy system by adjusting the Zn/Y weight ratio. 6,7) In recent years, Long Period Stacking Ordered (LPSO) Phase are attractive as the special structure owing to their good characteristics for specific strength and damping capacity, which have a great potential to be used in Mg ZnRE alloys.…”

Section: Introductionmentioning

confidence: 99%

Effects of Heat Treatment on the Morphology of Long-Period Stacking Ordered Phase and the Corresponding Damping Capacities of Mg-Cu-Mn-Zn-Y Alloys

Qin

Wang

et al. 2015

Mater. Trans.

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Different cooling processes of solid solution treatment, such as quenching in water and cooling in furnace, were introduced to Mg3Cu 1Mn1.8Zn10Y (mass%) alloy. The morphology of long-period stacking ordered (LPSO) phase and the corresponding damping capacities were investigated in the present study. The block-shaped and the lamellar-shaped LPSO phases can be obtained through different cooling processes. Furthermore, the lamellar-shaped 14H LPSO phase grew and ran through the whole grains. Comparison of the damping capacities of the alloys with different morphologies, it reveals that the lamellar LPSO phases precipitated in the matrix are more conducive to the damping capacity that Q ¹1 ² 0.052 at strains exceeding 1 © 10 ¹3. The grain size is almost same and no new phase is found after the processes. Meanwhile, it can conclude that the sample cooled in the furnace exhibits higher damping capacity due to the coarse grains and formation of lamellar-shaped 14H LPSO phase.

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“…4,7) In contrast, several works using synchrotron radiation 4,16,17) and scanning probe microscopy 22) showed that the periodicity that appears first in the alloy system does not necessarily the most stable one, and the in-plane order structure in the segregated layer may change with time, temperature and composition.…”

Section: Introductionmentioning

confidence: 99%

Stability of Long-Period Stacking Ordered Structures at Elevated Temperatures Examined by Multicolor Synchrotron Radiation X-ray Scattering/Diffraction Measurements

et al. 2015

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Stability of long-period stacking ordered (LPSO) structures of Mg-Zn-Y ternary alloys at elevated temperatures was examined by multicolor synchrotron radiation small-and medium-angle scattering/diffraction. The LPSO structures directly melted during heating, and the formation of LPSO was observed from supercooled liquid. The temperatures of complete dissolution and the onset of formation of LPSO phases were measured by monitoring the first diffraction peak of 14H, 18R and 10H compositional modulation. The stability of composition modulation in c axis direction was found to be the same as that of L1 2 cluster ordering in the segregation layer in both heating and cooling processes, i.e., dissolution and formation. Supercooling of LPSO was obtained for the heating/cooling rate of 10 K/min.

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The 18R and 14H long-period stacking ordered structures in Mg–Y–Zn alloys

Cited by 592 publications

References 28 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

Effects of Heat Treatment on the Morphology of Long-Period Stacking Ordered Phase and the Corresponding Damping Capacities of Mg-Cu-Mn-Zn-Y Alloys

Stability of Long-Period Stacking Ordered Structures at Elevated Temperatures Examined by Multicolor Synchrotron Radiation X-ray Scattering/Diffraction Measurements

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