Formation of quasicrystals in Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass

Wanderka, N.; Macht, M.‐P.; Seidel, M.; Mechler, S.; Ståhl, Kenny; Jiang, J.Z.

doi:10.1063/1.1329636

Cited by 69 publications

(49 citation statements)

References 22 publications

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“…This phase has been observed previously in Vit4. 17 After both crystallization events have finished during low temperature annealing of the three alloys, XRD data exhibit a large number of peaks which result from the presence of Be 2 Zr, Zr 2 Cu, and other phases, as has been shown in previous studies. 18 Though peaks at positions corresponding to the quasicrystalline phase are still present as well, it cannot be unambiguously determined whether the quasicrystalline phase remains after the second crystallization event.…”

Section: Resultsmentioning

confidence: 77%

“…It has been postulated that this metastable phase eventually transforms to one or more new phases after a sufficient amount of annealing time at a given temperature. 17,20 After the primary crystallization, a second crystallization process produces the remainder of the peaks observed in XRD. Whereas at low temperatures the phases that appear after the formation of the quasicrystals seem to vary somewhat between the alloys, at high temperatures all the alloys appear to crystallize very rapidly, forming a similar distribution of phases.…”

Section: Discussionmentioning

confidence: 99%

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Timescales of crystallization and viscous flow of the bulk glass-forming Zr-Ti-Ni-Cu-Be alloys

2003

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Crystallization behavior and equilibrium viscosity of a series of alloys in the Zr-Ti-Cu-Ni-Be system are studied using multiple techniques to determine the various contributions to glass-forming ability. Lowtemperature time-temperature-transformation diagrams of alloys whose compositions lie at equally spaced points along the tie line from Zr 38.5 Ti 16.5 Cu 15.25 Ni 9.75 Be 20 to Zr 46.25 Ti 8.25 Cu 7.5 Ni 10 Be 27.5 are measured during isothermal annealing of initially amorphous specimens. Surprisingly, for all investigated alloys, a primary quasicrystalline phase forms at a rate which varies substantially with alloy composition. Subsequent constant heating measurements, x-ray-diffraction patterns obtained after various states of annealing, beam bending viscosity results, and previous thermal analysis are all used to describe the influences on crystallization in this series. The description of both the kinetic and thermodynamic aspects of crystallization allows for an explanation of the crystallization mechanism. In addition, it explains why, in this series, thermal stability is greatest in those alloys with the poorest glass-forming ability. Overall, the investigations reveal that simple criteria like thermal stability or high viscosity fail to predict the glass-forming ability in complex bulk glass-forming systems.

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Section: Resultsmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Timescales of crystallization and viscous flow of the bulk glass-forming Zr-Ti-Ni-Cu-Be alloys

2003

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“…It is clear that after 1 min the sample is still amorphous while the XRD pattern recorded after 4 min shows some broad diffraction peaks which can be indexed with a primitive icosehedral structure. 18,23 No intermetallic Zr 2 Pd compound was detected. In the XRD pattern recorded after 5 min, a tiny intermetallic Zr 2 Pd compound appears together with the quasicrystalline phase.…”

Section: A͒mentioning

confidence: 99%

“…Recently, after the discovery of the formation of quasicrystals from Zr-Al-Cu-Ni metallic glasses, 1 quasicrystals have been found to form upon crystallization in many Zrbased alloy systems, such as ZrM ͑MϭPd and Pt͒, 2,3 ZrNiM ͑MϭPd, Au, Pt, and Ti͒, 4,5 ZrCuM ͑Al and Pd͒, 6,7 ZrAlCuPd, 7 ZrCuNiPd, 7 ZrAlNiM ͑MϭCu, Pd, Au, and Pt͒, 1,8 -10 ZrCuTiNi, 11 ZrAlNiCuM ͑MϭTi, Au, Pt, Pd, and Ag͒, 7,[12][13][14][15][16][17] ZrTiCuNiBe, 18 and ZrTiNbCuNiAl. 19 Furthermore, Inoue and co-workers 16 found that bulk quasicrystalline ZrAlNiCuM ͑MϭPd and Ag͒ alloys exhibit high strength and good ductility.…”

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confidence: 99%

Evidence of polymorphous amorphous-to-quasicrystalline phase transformation in Zr66.7Pd33.3 metallic glass

Jiang

Saksl

Saida

et al. 2002

Applied Physics Letters

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The amorphous-to-quasicrystalline phase transformation and the pressure effect on the transformation in a Zr 66.7 Pd 33.3 metallic glass have been investigated by in situ x-ray diffraction measurements using synchrotron radiation. It is found that the transformation is a polymorphous reaction and external pressure enhances the onset temperature for the formation of quasicrystals with a rate of 22 K/GPa while the temperature interval for the stability of quasicrystals remains almost unchanged in the pressure range of 0-4 GPa. The enhancement of the onset temperature for the formation of quasicrystals has been further discussed with the nucleation theory.

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“…Recently, after the discovery of the formation of quasicrystals from Zr-Al-Cu-Ni metallic glasses, 1 quasicrystals have been found to form upon crystallization in many Zrbased alloy systems, such as ZrM (M ϭPd and Pt͒, 2,3 ZrNiM (M ϭPd, Au, Pt, and Ti͒, 4,5 ZrCuM ͑Al and Pd͒, 6,7 ZrAlCuPd, 7 ZrCuNiPd, 7 ZrAlNiM (M ϭCu, Pd, Au, and Pt͒, 1,8 -10 ZrCuTiNi, 11 ZrAlNiCuM (M ϭTi, Au, Pt, Pd, and Ag͒, 7,[12][13][14][15][16][17] ZrTiCuNiBe, 18 and ZrTiNbCuNiAl. 19 Furthermore, Inoue and coworkers 16 found that bulk quasicrystalline ZrAlNiCuM (M ϭPd and Ag͒ alloys exhibit high strength and good ductility.…”

Section: Introductionmentioning

confidence: 99%

Pressure effect on crystallization temperature in Zr70Pd30 metallic glass

Jiang

Jeppesen

Saida

et al. 2004

Journal of Applied Physics

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The pressure effect on amorphous-to-quasicrystalline-to-intermetallic phase transformations in a Zr 70 Pd 30 metallic glass has been investigated by in situ x-ray diffraction measurements using synchrotron radiation. It is found that the glass crystallizes in two steps: ͑1͒ amorphous-to-icosahedral quasicrystalline and ͑2͒ icosahedral quasicrystalline-to-intermetallic Zr 2ϩx Pd alloy. The intermetallic alloy has a tetragonal structure with lattice parameters, a ϭ3.310(1) Å and cϭ10.974(1) Å, and a space group of I4/mmm. External pressure enhances the onset temperatures for the formation of quasicrystalline phase and intermetallic compound with rates of 11Ϯ3 and 9Ϯ4 K/GPa, respectively, while the temperature interval for the stability of quasicrystals remains almost unchanged in the pressure range of 0-3 GPa. External pressure does not affect the phase-selection sequence. The enhancement of the onset temperature for the formation of quasicrystals has been further discussed with the nucleation theory.

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Formation of quasicrystals in Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass

Cited by 69 publications

References 22 publications

Timescales of crystallization and viscous flow of the bulk glass-forming Zr-Ti-Ni-Cu-Be alloys

Timescales of crystallization and viscous flow of the bulk glass-forming Zr-Ti-Ni-Cu-Be alloys

Evidence of polymorphous amorphous-to-quasicrystalline phase transformation in Zr66.7Pd33.3 metallic glass

Pressure effect on crystallization temperature in Zr70Pd30 metallic glass

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