Kinetics of the amorphous to icosahedral phase transformation in AlCuV alloys

Holzer, J. C.; Kelton, K. F.

doi:10.1016/0956-7151(91)90152-q

Cited by 131 publications

(55 citation statements)

References 17 publications

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“…Since an icosahedral phase (I-phase) was discovered in rapidly solidified Al-Mn alloys 1) and the structure was interpreted by a new concept of quasicrystal, 2) a number of icosahedral quasicrystalline alloys has been synthesized in Al-, 3,4) Pd- 5) and Ti-based 6) systems. Later the precipitation of I-phase from Zr-based metallic glass was reported.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of Zr-Al-Cu-Ni-Ag Ingot and the Thermal Stability of Corresponding Glass

Yan

et al. 2003

Mater. Trans.

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Zr 65 Al 7:5 Ni 10 Cu 12:5 Ag 5 ingots with different microstructures are obtained by changing the number of the repeated arc melting times. Differential scanning calorimetry (DSC) traces show that when the microstructure of the mother ingot becomes finer, the thermal stability of the glassy alloy improves during the crystallization of the glass. Because of the structure heredity, the finer the mother ingot microstructure is, the smaller the average size of the (Zr,Ag)-rich short-range orders in the glassy alloy is. The decrease of the size of the short-range orders makes the rearrangement of the elements more difficult in the glassy alloy. As a result, the activation energy for precipitation and decomposition of the Iphase becomes higher.

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Section: Introductionmentioning

confidence: 99%

Microstructure of Zr-Al-Cu-Ni-Ag Ingot and the Thermal Stability of Corresponding Glass

Yan

et al. 2003

Mater. Trans.

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“…For the amorphous-to-quasicrystalline phase transformation, the interfacial energy of quasicrystals is usually small, e.g., ϳ13 mJ/m 2 for Zr 69. 13 ⌬G*, which is proportional to 3 /(P⌬Vϩ⌬G) 2 , could be negligible due to small value, where ⌬V and ⌬G are the changes of molar volume and free energy between the phases involved. Thus, the nucleation rate of the formation of quasicrystals mainly depends on Q n .…”

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confidence: 99%

Pressure effect on crystallization kinetics in Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass

Jiang¹,

Gerward²,

Xu³

2002

Applied Physics Letters

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Crystallization kinetics of a Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass in the supercooled liquid region have been investigated by performing in situ high-temperature and high-pressure x-ray diffraction measurements using synchrotron radiation. A pressure–time–temperature–transformation diagram, describing the onset of crystallization as a function of time during isothermal annealing under pressure, is presented. Different pressure dependences of crystallization kinetics in the temperature range for the glass have been observed and further be explained by a model of competing processes of the thermodynamic potential barrier of nucleation and the diffusion activation energy under pressure.

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“…It has also been reported that the Avrami exponent n is in the range between 1 and 2 for the precipitation of the nanoicosahedral phase from Al 55 Mn 20 Si 25 and Al 75 Cu 15 V 10 amorphous alloys. 8,27,28) Kelton et al 28) showed that the presence of inhomogeneous distribution of quenched-in nuclei through the ribbon thickness was a possible reason for the low JMA exponent. To evaluate the GFA of Zr 64 Ni 7 Nb 3 Cu 16 Al 10 alloy, rod samples with different diameters were fabricated by copper mold casting.…”

Section: Resultsmentioning

confidence: 99%

Precipitation of Icosahedral Phase in Zr-Ni-Nb-Cu-Al Metallic Glasses

Zhao

Pang

et al. 2009

Mater. Trans.

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The crystallization behaviors of Zr-Ni-Nb-Cu-Al metallic glasses are greatly influenced by the substitution of Ni for Zr. For the glassy Zr 71Àx Ni x Nb 3 Cu 16 Al 10 (x ¼ 7, 9, 11 at%) alloys, the onset temperature of crystallization T x increases from 717 to 748 K with increasing Ni content from 7 at% to 11 at%. The primary crystallization reaction of the studied glassy alloys corresponds to the formation of icosahedral phase from amorphous matrix. The precipitation of quasicrystalline phase with a large volume fraction in the Zr 64 Ni 7 Nb 3 Cu 16 Al 10 alloy indicates that the decrease of Ni content promotes the formation of icosahedral phase. Johnson-Mehl-Avrami analysis of isothermal transformation data suggests that the icosahedral phase precipitation proceeds by a diffusion-controlled growth mode with nearly constant nucleation rate. Furthermore, the Zr 71Àx Ni x Nb 3 Cu 16 Al 10 (x ¼ 7, 9, 11 at%) alloys possess high glass-forming ability, and the critical diameter for glass formation reaching 6 mm, 9 mm and 9 mm by copper-mould casting method, respectively.

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Kinetics of the amorphous to icosahedral phase transformation in AlCuV alloys

Cited by 131 publications

References 17 publications

Microstructure of Zr-Al-Cu-Ni-Ag Ingot and the Thermal Stability of Corresponding Glass

Microstructure of Zr-Al-Cu-Ni-Ag Ingot and the Thermal Stability of Corresponding Glass

Pressure effect on crystallization kinetics in Zr46.8Ti8.2Cu7.5Ni10Be27.5 bulk glass

Precipitation of Icosahedral Phase in Zr-Ni-Nb-Cu-Al Metallic Glasses

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