The Zn-Mg-Y phase diagram involving quasicrystals

Tsai, An‐Pang; Murakami, Yoshihiro; Niikura, Akio

doi:10.1080/01418610008212098

Cited by 130 publications

(67 citation statements)

References 12 publications

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“…It is unexpectedly observed that selected area diffraction (SAD) patterns of the precipitates during aging at 873 K in the alloy containing Si exhibit nearly perfect fivefold symmetry similar to the one observed in the icosahedral quasicrystalline phase. 4) Since the icosahedral quasicrystal, hereafter denoted as Iphase, was first discovered in rapidly solidified Al-Mn alloys, 4) stable icosahedral quasicrystals have discovered in many alloys such as Al-, 5) Zn-, 6) Cd- 7) and Cu-based 8) alloys. In our experiments, there would be scientific interest in the precipitation of I-phase during isothermal aging in Fe-based alloys.…”

Section: Introductionmentioning

confidence: 99%

Precipitation of the Icosahedral Quasicrystalline Phase, R-phase and Laves Phase in Ferritic Alloys

2004

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Precipitation behavior of intermetallic phases in ferrite matrix is investigated by transmission electron microscopy (TEM) in Fe-10Cr-1.4W-4.5Co (at%) alloys with and without 0.3 at%Si. It is intended to provide basic information for the alloy design of ferritic heat resistant alloys strengthened by intermetallic compounds. In the alloy containing Si, icosahedral quasicrytalline phase (I-phase) is found to precipitate during aging at 873 K. It is confirmed that selected area diffraction (SAD) patterns of the precipitates exhibit two-, three-and five-fold symmetry and have diffraction spots in the positions related to the golden section. In the Si-free alloy, the R-phase precipitates instead of I-phase at 873 K, and the Laves phase precipitates in both alloys during aging at higher temperature, 973 K. The Laves phase formed at 973 K transforms to the Iphase in the alloy containing Si but to the R-phase in the Si-free alloy during subsequent aging at 873 K. It is found that the structures among icosahedral quasicrystalline and crystalline R-and Laves phases are closely similar by comparing the orientation relationship, precipitate morphology and stability of I-phase with those of R-and Laves phases.

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Section: Introductionmentioning

confidence: 99%

Precipitation of the Icosahedral Quasicrystalline Phase, R-phase and Laves Phase in Ferritic Alloys

2004

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“…It is consistent with the value of icosahedral phase reported in Mg-Zn-Y alloys. 15) XRD analyses also indicate the presence of icosahedral phase in as-cast state as shown in Fig. 2.…”

Section: Methodsmentioning

confidence: 92%

Mechanical Properties and Microstructure of Twin-Roll Cast Mg-Zn-Y Alloy

et al. 2008

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Mg 97:3 Zn 2:3 Y 0:4 alloy has been subjected to twin-roll casting (TRC) process. As-cast microstructure consists of -Mg dendrite and icosahedral interdendritic phase. The icosahedral phase present in TRC alloy is found to be thermally unstable and transforms to H-phase and Wphase during subsequent thermo-mechanical treatment (TMT) at 400 C. It shows that the pre-heating condition has a significant effect on the microstructural evolution during TMT. The specimen pre-heated at 400 C for 30 min shows elongated microstructure after TMT, while the specimen pre-heated at 400 C for 12 h shows equiaxed recrystallized structure after TMT. Such homogeneous microstructure of the specimen pre-heated at 400C for 12 h results in better combinations of strength and ductility than the specimen pre-heated at 400 C for 30 min.

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“…This phase possesses a five fold symmetry and does not have translational symmetry. This phase also occurs in equilibrium with a matrix phase 1) when particles are dispersed, showing a definite orientation relationship and a strong interface, 2) i.e., the formation of a coherent interface between the matrix and the particle. The formation of a quasicrystal phase has been confirmed in the Mg-Zn-RE (RE = Y, Gd, Tb, Dy, Ho and Er) systems through various experiments, [3][4][5] and the quasicrystal phase has been studied as a strengthening phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of Quasicrystal Phase Particle Dispersion on Mechanical Properties in Mg-Zn-Al Alloys

et al. 2011

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Four kinds of Mg-x mass%Zn-y mass%Al (x ¼ 6, 8, 10, 12 and y ¼ 3, 4, 5, 6) alloys, each with a grain size of 2$3 mm and containing quasicrystal phase particles, were successfully produced by casting and extrusion. These rare-earth free wrought processed magnesium alloys showed a reduction in mechanical asymmetry and a weak basal texture. Although the yield strength improved, the elongation decreased with increasing volume fraction of quasicrystal phase particle. The decrease in ductility was related to the existence of coarse quasicrystal phase particles. The strength was affected by the interface strength mechanism; however, the coherency strain in the quasicrystal phase was smaller than that in the conventional phase, due to the strong matching between the matrix and the quasicrystal phase.

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The Zn-Mg-Y phase diagram involving quasicrystals

Cited by 130 publications

References 12 publications

Precipitation of the Icosahedral Quasicrystalline Phase, R-phase and Laves Phase in Ferritic Alloys

Precipitation of the Icosahedral Quasicrystalline Phase, R-phase and Laves Phase in Ferritic Alloys

Mechanical Properties and Microstructure of Twin-Roll Cast Mg-Zn-Y Alloy

Effect of Quasicrystal Phase Particle Dispersion on Mechanical Properties in Mg-Zn-Al Alloys

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