Precise Measurement of Density in the Isothermal Relaxation Processes of Pd&lt;SUB&gt;42.5&lt;/SUB&gt;Cu&lt;SUB&gt;30&lt;/SUB&gt;Ni&lt;SUB&gt;7.5&lt;/SUB&gt;P&lt;SUB&gt;20&lt;/SUB&gt; and Zr&lt;SUB&gt;50&lt;/SUB&gt;Cu&lt;SUB&gt;40&lt;/SUB&gt;Al&lt;SUB&gt;10&lt;/SUB&gt; Glasses

Haruyama, Osami; Yokoyama, Yoshihiko; Inoue, Akihisa

doi:10.2320/matertrans.mj200772

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…Unveiling the creation of an ultradense metallic glass thorough the measurement of bulk properties Figure 3 presents the density measurement results of the as-cast, relaxed, high-pressure heat-treated, and crystallized samples. The as-cast metallic glass had a density of 6.882 g/cm 3 , which is almost the same as that reported elsewhere 18 . As expected, the density of the crystallized sample was the highest obtained herein at 6.980 g/cm 3 .…”

Section: Resultssupporting

confidence: 86%

“…Isothermal annealing of the as-cast sample at 740 K for 5,10,17,18,20,22, and 23 min and successive isochronal DSC scans were conducted to evaluate the thermal properties/structural differences between the heat-treated sample under ambient pressure and the high-pressure heat-treated samples by comparing the crystallization temperature (T x ) and crystallization enthalpy (ΔH cry ). The microstructures of the samples that were isothermally heat-treated at 740 K for 17, 20 and 23 min were examined using TEM.…”

Section: Static Annealing Of the As-cast Sample At Ambient Pressurementioning

confidence: 99%

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Unveiling a new type of ultradense anomalous metallic glass with improved strength and ductility through a high-pressure heat treatment

et al. 2019

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An anomalous glass was discovered through high-pressure heat treatment (5.5 GPa at 850 K) followed by rapid cooling of a Zr 50 Cu 40 Al 10 metallic glass. Despite a reduction in the crystallization temperature and enthalpy, high-resolution transmission electron microscopy analysis revealed that the collected bulk sample maintained a fully amorphous structure. The density of the sample was 0.6% larger than that of the as-cast state and was even larger than that of the partially crystallized state. These results suggest the formation of an ultradense packing glass that cannot be obtained through conventional annealing. Compression test results indicated a significant increase in the Young's modulus and fracture strength, supporting the creation of an anomalous metallic glass. In addition, plasticity was observed in the treated sample. It was therefore concluded that the high-pressure heat treatment enabled the creation of a new type of glass that is normally overshadowed by the crystallized phase at atmospheric pressure. We explained the creation of the ultradense glass by introducing a pressure parameter (P) to the conventional volume (v) -temperature (T) diagram.

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Section: Resultssupporting

confidence: 86%

Section: Static Annealing Of the As-cast Sample At Ambient Pressurementioning

confidence: 99%

Unveiling a new type of ultradense anomalous metallic glass with improved strength and ductility through a high-pressure heat treatment

et al. 2019

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“…2, the simulation data can be fitted well and the fitted parameters are  = 0.51 and  = 3.9 ns for T = 580 K and  = 0.85 and  = 0.48 ns for T = 700 K. In both cases, the glassy state is far from its fully relaxed state at the corresponding temperature in the simulation time and the relaxation process is still going on, so the fitted values of  and  may change in a longer observation. However, it is quite interesting that this behavior has the same nature as has been found in the relaxation behavior of metallic glasses by the experimental studies [9,10,11,12], although the handled time-scales of observation are completely different between the experiments and the simulations.…”

Section: Resultssupporting

confidence: 57%

Molecular Dynamics Study on Structural Relaxation of Metallic Glasses

Shimono

Onodera

2010

MSF

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Abstract. Structural relaxation process in the Zr-Cu metallic glasses is investigated by using molecular dynamics simulations. The enthalpy change in isothermal annealing of the glassy state cannot be fitted by a simple exponential function but obeys a stretched exponential function, which indicates that the relaxation in glassy phase is not a single Debye type process. A close examination of individual atomic motion reveals that the enthalpy relaxation is related to a string-like cooperative motion of atoms. The analysis of the local symmetry around each atom shows that a network of the icosahedral clusters grows in the glassy phases during annealing and it closely relates to the free-volume annihilation in the structural relaxation.

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“…Here, A is a certain physical value (e.g. viscosity 14) , density 15) etc. ), τ (= 1/cfkf) is a relaxation time.…”

Section: (4)mentioning

confidence: 99%

Rejuvenation Behavior and New Classification of β-relaxation Region in Pd-based Metallic Glass

Yamada

Tanaka

Guo

et al. 2019

J. Soc. Mat. Sci., Japan

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We have focused on a rejuvenation behavior of recovery annealed Pd42.5Cu30Ni7.5P20 metallic glass. Specific heat measurement results revealed that only 33%, which is lower than that (44%) of a Zr50Cu40Al10 metallic glass, was recovered by annealing. This result indicates that the recovery of a Pd42.5Cu30Ni7.5P20 metallic glass is more difficult than the Zr-based alloy. The hardness measurement results obtained from the indentation test also supported this finding. The time dependence of the normalized storage modulus E'/Eu at 0.8Tg of both metallic glasses were successfully demonstrated by the KWW (Kohlrausch-Williams-Watts) equation, which means that the relaxation/rejuvenation behavior of each sample was well described by the free volume change. It also suggested that the distribution of relaxation modes of the Pd42.5Cu30Ni7.5P20 metallic glass is much narrower in a β-relaxation region. The normalized loss modulus E"/Eu implied that two areas, one is in correlation to the free volume change and the other is not, are embedded in the intrinsic β-relaxation region and the lower rejuvenation ability in the Pd42.5Cu30Ni7.5P20 metallic glass may originate from a low volume fraction of the former area. The present study will provide the universal information for the research subject on the thermal rejuvenation in metallic glasses.

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Precise Measurement of Density in the Isothermal Relaxation Processes of Pd<SUB>42.5</SUB>Cu<SUB>30</SUB>Ni<SUB>7.5</SUB>P<SUB>20</SUB> and Zr<SUB>50</SUB>Cu<SUB>40</SUB>Al<SUB>10</SUB> Glasses

Cited by 13 publications

References 13 publications

Unveiling a new type of ultradense anomalous metallic glass with improved strength and ductility through a high-pressure heat treatment

Unveiling a new type of ultradense anomalous metallic glass with improved strength and ductility through a high-pressure heat treatment

Molecular Dynamics Study on Structural Relaxation of Metallic Glasses

Rejuvenation Behavior and New Classification of β-relaxation Region in Pd-based Metallic Glass

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