Decomposition of the Supercooled Liquid of the Bulk Amorphous Alloy Zr&lt;sub&gt;41&lt;/sub&gt;Ti&lt;sub&gt;14&lt;/sub&gt;Cu&lt;sub&gt;12.5&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt;Be&lt;sub&gt;22.5&lt;/sub&gt;

Macht, M.‐P.; Wanderka, N.; Wiedenmann, A.; Wollenberger, H.; Wei, Qing; Fecht, Hans Jörg; Klose, S.

doi:10.4028/www.scientific.net/msf.225-227.65

Cited by 54 publications

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“…These results demonstrate that the Zr based BMG crystallizes on a nanometre scale during isothermal annealing at the elevated temperature. Similar crystallization behaviour has been found in the Fe-free Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 BMG and has been extensively investigated by means of various analytical methods [25][26][27][28][29][30][31][32]. Previous studies reveal that the formation of nanocrystals during isothermal annealing of the Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 alloy involves preceding decomposition on a nanometre scale, which initiates an abrupt onset of nucleation within one of the decomposed phases but however limits the grain size and density of the crystalline precipitates.…”

Section: Methodssupporting

confidence: 66%

Isothermal internal friction behaviour of a Zr based bulk metallic glass with large supercooled liquid region

Wang

et al. 2006

J. Phys. D: Appl. Phys.

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In this paper, the internal friction behaviour of Zr-Ti-Cu-Ni-Be bulk metallic glass (BMG) containing 2 at% Fe at elevated temperatures has been studied in isothermal dynamic mechanical analysis experiments. The experiments lead to the determination of metastable equilibrium internal friction Q −1 e , as a function of temperature, which can be well described by the Maxwell model with viscosity, η(T), following a Vogel-Fulcher-Tammann (VFT) relation or Arrehnius law. Comparison with the Zr-Ti-Cu-Ni-Be glass-forming liquid shows that a small addition of Fe results in a stronger liquid behaviour of the alloy, exhibiting a higher strength parameter as well as lower VFT temperature and therefore correlates better glass forming ability and thermal stability. From the isothermal internal friction data, the activation energies for viscous flow and primary crystallization of the Zr based supercooled metallic liquid are also derived. It is found that the former is comparable to the activation energy controlling the diffusion process of atoms, e.g. the Ni element of medium size and higher mobility among the components of this alloy, while the latter to that of atoms, e.g. the Ti element of larger size and lower mobility. Thus, it is proposed that both isothermal viscous flow and primary crystallization of the alloy in the supercooleld liquid region are atom diffusion-controlled processes. However, the dominating atomic species are different from each other in the multicomponent Zr based BMG.

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Section: Methodssupporting

confidence: 66%

Isothermal internal friction behaviour of a Zr based bulk metallic glass with large supercooled liquid region

Wang

et al. 2006

J. Phys. D: Appl. Phys.

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“…This feature can be attributed to gradual changes of the composition in the boundary layer. Decomposition of Zr 41 Ti 14 Cu 12.5 Ni 10 Be 22.5 glass and two-phase (Ti-reach and Be-reach) glass formation as result of liquid state aging (at T > T g ) was revealed in [21,22]. Therefore compositional stratification of this glass is an expected property.…”

Section: Resultsmentioning

confidence: 99%

Nanometer-Scale Heterogeneities of the Structure of Zirconium-Based Bulk Metallic Glasses

Bakaı̆

Sadanov

Ksenofontov

et al. 2012

Metals

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Structure of amorphous alloys ZrTiCuNiBe and ZrTiCuNiAl is studied by means of low-field ion and combined field-emission microscopy. In both alloys the structural heterogeneities of nanometer-scale are clearly revealed. The surface layers formed by field evaporation possess a cellular structure. The cells have polygonal shape with transverse size ranging from 2 nm to 20 nm. It is established that variance of the local energy of field evaporation is of 0%-5% in the cell body. A local minimum of the field evaporation energy is observed within the cell boundaries (intercluster boundaries). In the minimum the depth is measured to be of 0.8 eV.

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“…An interesting feature of this material is that the microstructure that is observed in the stage of primary crystallization is composed of nanocrystalline precipitates randomly embedded in the remaining amorphous matrix [28][29][30][31]. Moreover, it has been demonstrated that the composite microstructure has a high thermal stability against secondary crystallization during subsequent prolonged thermal exposure in SLR [29][30][31]. So, in the present work, the Zr based alloy subjected to primary nanocrystallization is chosen as the model material to study the steady state plastic flow of the BMG composite containing nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

“…Over the past years, a large number of experiments have been performed to study the effect of thermal treatment on the Zr based alloy by using a variety of techniques [28][29][30][31][32][33][34][35][36]. An interesting feature of this material is that the microstructure that is observed in the stage of primary crystallization is composed of nanocrystalline precipitates randomly embedded in the remaining amorphous matrix [28][29][30][31]. Moreover, it has been demonstrated that the composite microstructure has a high thermal stability against secondary crystallization during subsequent prolonged thermal exposure in SLR [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

High temperature homogeneous plastic flow behavior of a Zr based bulk metallic glass matrix composite

Wang¹,

Wang²,

Fu³

et al. 2010

Journal of Alloys and Compounds

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Decomposition of the Supercooled Liquid of the Bulk Amorphous Alloy Zr<sub>41</sub>Ti<sub>14</sub>Cu<sub>12.5</sub>Ni<sub>10</sub>Be<sub>22.5</sub>

Cited by 54 publications

References 0 publications

Isothermal internal friction behaviour of a Zr based bulk metallic glass with large supercooled liquid region

Isothermal internal friction behaviour of a Zr based bulk metallic glass with large supercooled liquid region

Nanometer-Scale Heterogeneities of the Structure of Zirconium-Based Bulk Metallic Glasses

High temperature homogeneous plastic flow behavior of a Zr based bulk metallic glass matrix composite

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