Volume and enthalpy relaxation in Zr55Cu30Ni5Al10 bulk metallic glass

Haruyama, Osami; Nakayama, Yasuo; Wada, R.; Tokunaga, Hitoo; Okada, Junpei; Ishikawa, Takehiko; Yokoyama, Yoshihiko

doi:10.1016/j.actamat.2009.11.025

Cited by 105 publications

(56 citation statements)

References 28 publications

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“…2(a), where the relaxation time of BMG heavily pre-annealed at 673 K for 1.8 © 10 3 s is shown for comparison. 6) Hence, the result of enthalpy relaxation is due to Qiao.…”

Section: Kinetics Of the Static ¡-Relaxationmentioning

confidence: 99%

“…The temperature dependence of ¢ ¡ is appreciable for the pre-annealed BMGs and the trend is analogous to the result for the static ¡-relaxation as reported elsewhere. 5,6,911) However, the as-cast BMG exhibits an interesting feature that the exponent retains a low value, approximately 0.5, even at 10 glass, the as-cast glass was pre-annealed at 691 K (10 K below T g ) for 1. The data on¸¡'s largely overlap irrespective of alloy compositions with some scatter.…”

Section: Kinetics Of the Static ¡-Relaxationmentioning

confidence: 99%

“…Such a trend is in accord with the general criterion of free volume model. 6,8) The kinetics of volume relaxation was well described by a SER-function with the relaxation time,¸¡, and the Kohlrausch exponent, ¢ ¡ , as below.…”

Section: Kinetics Of the Static ¡-Relaxationmentioning

confidence: 99%

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Comparison of Structural Relaxation Behavior in As-Cast and Pre-Annealed Zr-Based Bulk Metallic Glasses Just below Glass Transition

et al. 2015

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The ¡-relaxation of pre-annealed Zr 55 Cu 30 Ni 5 Al 10 bulk metallic glasses (BMGs) was compared with that of as-cast Zr-based BMGs including Zr 55 Cu 30 Ni 5 Al 10 . The ¡-relaxation was investigated by volume relaxation. The relaxation behavior was well described by a stretched exponential relaxation function, ÈðtÞ % exp½Àðt=¸¡Þ ¢ ¡ , with the isothermal relaxation time,¸¡, and the Kohlrausch exponent, ¢ ¡ . The ¢ ¡ exhibited the strong temperature dependence for the pre-annealed BMG, while the weak temperature dependence was visualized for the as-cast BMG similar to the dynamic relaxation. The¸¡'s were modified by Moynihan and Narayanaswamy-Tool-Moynihan methods that reduce the difference in the thermal history of sample. As a result, the relaxation kinetics in the glass resembled that of a liquid deduced from the behavior of viscosity in the supercooled liquid.

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“…2(a), where the relaxation time of BMG heavily pre-annealed at 673 K for 1.8 © 10 3 s is shown for comparison. 6) Hence, the result of enthalpy relaxation is due to Qiao.…”

Section: Kinetics Of the Static ¡-Relaxationmentioning

confidence: 99%

Section: Kinetics Of the Static ¡-Relaxationmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Structural Relaxation Behavior in As-Cast and Pre-Annealed Zr-Based Bulk Metallic Glasses Just below Glass Transition

et al. 2015

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“…9) can be derived by modifying the equation suggested by Kim et al, 20 which was a modified version of the HagenPoiseuille's law by combining the viscous and capillary contributions for an accurate description of the infiltration process on nanometer length scale. 21 This determines the wetting time (t) to flow a SCL and/or liquid into a channel of diameter [12][13][14][15] Transition temperature Coated surface roughness Hardness of coating layer (Hv) Substrate Averaged from 10 results measured in different areas (100 lm Â 100 lm) by 3D surface profiler.…”

Section: B Role Of Sclr In Ad Process On Bmg Substratesmentioning

confidence: 99%

Enhancement of interface anchoring and densification of Y2O3 coating by metal substrate manipulation in aerosol deposition process

Kim

Lee

Park

et al. 2015

Journal of Applied Physics

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The interface anchoring and densification of Y2O3 coatings prepared by aerosol deposition (AD) process were systematically investigated for various types of metal substrates. At initial anchoring stage in AD process, the kinetic energy of impacted particles is converted to the heat energy, which instantly elevates the interface temperature between coating layer and substrate. Thus, the Sn substrate with low melting temperature (∼505 K) results in strong impact anchoring by local interface melting during AD process. On the other hand, the continuous collision and fracture of impacted particles lead to solid consolidation and densification of deposited coating layers. Thus, the SUS substrate with high hardness (∼173 Hv) leads to a highly densified coating layer. Indeed, the bulk metallic glass (BMG) substrates, which have unique low processable temperature (<800 K) called supercooled liquid region and ultra-high hardness (>500 Hv), give rise to both excellent interface anchoring and densification of thick Y2O3 layers with a nano-crystalline structure by AD process. These advantages of the BMG substrates can be used more widely by forming metallic glass buffer layer on various substrates applied to AD process.

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“…However, for metallic glasses the dynamical relaxation can be measured only by mechanical analysis where the shear modulus and the mechanical loss are measured as a function of temperature and frequency. The structural relaxation can be observed by various SRA measurements of a variety of physical properties, such as viscosity, 611) positron annihilation lifetime, 12,13) enthalpy, 11,1416,19,20) and volume 11,1720) as well as mechanical properties. 21) Structural relaxation was reported by Fan 14) by means of enthalpy relaxation in a temperature range just below T g for Pd 43 Cu 27 Ni 10 P 20 BMG.…”

Section: Introductionmentioning

confidence: 99%

Volume and Enthalpy Relaxation in Pd42.5Cu30Ni7.5P20 Bulk Metallic Glass

et al. 2014

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The kinetics of structural relaxation in Pd 42.5 Cu 30 Ni 7.5 P 20 bulk metallic glass (BMG) was investigated by means of volume relaxation and enthalpy relaxation in the temperature range below T g (µ 573 K). The measured relaxation time was significantly longer than the ¡-relaxation time reported by dynamical mechanical analysis (DMA), indicating that these two relaxation processes are fundamentally different from each other. The temperature dependence of electrical resistivity suggests that the origin of the ¢-relaxation process that occurs between room temperature and T g may be the compositional short range ordering. Anomalous volume expansion was observed in the initial stage of relaxation, which was attributed to annihilation of the p-type defects with very short relaxation time.

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Volume and enthalpy relaxation in Zr55Cu30Ni5Al10 bulk metallic glass

Cited by 105 publications

References 28 publications

Comparison of Structural Relaxation Behavior in As-Cast and Pre-Annealed Zr-Based Bulk Metallic Glasses Just below Glass Transition

Comparison of Structural Relaxation Behavior in As-Cast and Pre-Annealed Zr-Based Bulk Metallic Glasses Just below Glass Transition

Enhancement of interface anchoring and densification of Y2O3 coating by metal substrate manipulation in aerosol deposition process

Volume and Enthalpy Relaxation in Pd<sub>42.5</sub>Cu<sub>30</sub>Ni<sub>7.5</sub>P<sub>20</sub> Bulk Metallic Glass

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