Nanocrystallization of Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 metallic glass

Martin, Isabelle; Ohkubo, T.; Ohnuma, M.; Déconihout, B.; Hono, K.

doi:10.1016/j.actamat.2004.05.038

Cited by 120 publications

(76 citation statements)

References 32 publications

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“…They reported interference maxima in the scattering intensity, giving evidence for spinodal decomposition on the nanometre scale in the amorphous phase upon annealing near T g , which is followed by nanocrystallization. These results have been later challenged by Hono and coworkers 40 by showing that no evidence for decomposition before the crystallization of icosahedral phase was observed using transmission electron microscopy, small-angle X-ray scattering and high-resolution three dimensional atom probe. Interpretations of these results appear controversial.…”

Section: Discussionmentioning

confidence: 81%

Liquid–liquid transition in a strong bulk metallic glass-forming liquid

et al. 2013

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Polymorphic phase transitions are common in crystalline solids. Recent studies suggest that phase transitions may also exist between two liquid forms with different entropy and structure. Such a liquid-liquid transition has been investigated in various substances including water, Al 2 O 3 -Y 2 O 3 and network glass formers. However, the nature of liquid-liquid transition is debated due to experimental difficulties in avoiding crystallization and/or measuring at high temperatures/pressures. Here we report the thermodynamic and structural evidence of a temperature-induced weak first-order liquid-liquid transition in a bulk metallic glassforming system Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 characterized by non-(or weak) directional bonds. Our experimental results suggest that the local structural changes during the transition induce the drastic viscosity changes without a detectable density anomaly. These changes are correlated with a heat capacity maximum in the liquid. Our findings support the hypothesis that the 'strong' kinetics (low fragility) of a liquid may arise from an underlying lambda transition above its glass transition.

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Section: Discussionmentioning

confidence: 81%

Liquid–liquid transition in a strong bulk metallic glass-forming liquid

et al. 2013

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“…2. It is obvious that the ion milled BMG exhibits the first exothermic peak disappearing, which indicates that the primary crystallization has occurred [7]. Although Li et al have found that the ion milling could induce more structural order than electropolishing [5], it is observed that the ion milling can also induce the primary crystallization as observed in the present study.…”

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confidence: 37%

“…Also, the corresponding SAED pattern shows more weak diffraction rings appear at higher diffraction angles (see Fig. 1d), indicating early stages of the nanocrystallization [7].…”

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confidence: 99%

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Effect of Preparation Method on TEM Specimen

Wang

Llewellyn

Fitzgerald

et al. 2005

MAM

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We have investigated the amorphous phase of bulk metallic glass Zr 41.25 We have examined the influences of TEM specimen preparation techniques on the microstructural evolution of the BMG.The Differential Scanning Calorimetry measurements were performed with a Perkin-Elmer Pyris 1 DSC. TEM observations were conducted on a Philips CM300 and a Philips EM430 machines both operating at 300 kV. One group of specimens were mechanical thinned and polished and then dimpled to a thickness of less than 15 um. This was followed by ion milling at an incident angle of 5 0 for approximately 9 h to electron transparency at room temperature using a Gatan 691 Precision Ion Polishing System. Another group of specimens were prepared by dispersing finely ground BMG powders onto holey carbon film supported by a microgrid. The toughness of BMG material prevented crushing of solid pieces using a mortar and pestle, instead powder was produced by grinding on a new sheet of diamond lapping film. The abrasive particles contaminating the powder were easily distinguished (and therefore avoided) in the TEM based on their different appearance and chemical composition.Representative TEM observations of the Zr 41.25 Ti 13.75 Ni 10 Cu 12.5 Be 22.5 BMG prepared by grinding are shown in Fig. 1a and b. At high magnification, the TEM image exhibits a maze-like pattern at the sub-nanomatre scale as shown in Fig. 1a. Fig. 1b shows a corresponding SAED pattern with two diffraction rings. All these features are consistent with an inherent amorphous character of the BMG. The ion milled BMG shows a quite different character (see Fig. 1c) -some patterns of thickness variation (presumed due to preferred etching) now dominate the TEM image. Also, the corresponding SAED pattern shows more weak diffraction rings appear at higher diffraction angles (see Fig. 1d), indicating early stages of the nanocrystallization [7].To further characterize the structure of the ion milled BMG, DSC analysis was carried out to monitor the crystallization process. Fig. 2 shows the DSC traces of the BMG prepared by ion milling. The ion

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“…They are in good agreement with that reported for Zr 41:25 Ti 13:75 Ni 10 Cu 12:5 Be 22:5 bulk metallic glass by other researchers. [27][28][29] Both the XRD and DSC confirm the fully glassy structure of the coating layer.…”

Section: Resultsmentioning

confidence: 85%

Enhancement of Strength and Corrosion Resistance of Copper Wires by Metallic Glass Coating

Chan

Xia

et al. 2009

Mater. Trans.

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Metallic glass was coated on copper (Cu) wires for enhancing their strength and corrosion resistance. The metallic glass coating has strong cohesion to the copper, and can effectively protect the wires from external forces and corrosive environments. Compared with bare Cu wires, the yield strength and the elastic strain limit of the coated wires have been significantly increased. The excellent corrosion resistance of the metallic glass coating has also provided essential shielding of the wires from chloride-containing electrolyte environments. The experimental results present a new technique for strengthening and enhancing the corrosion resistance of copper wires.

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Nanocrystallization of Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 metallic glass

Cited by 120 publications

References 32 publications

Liquid–liquid transition in a strong bulk metallic glass-forming liquid

Liquid–liquid transition in a strong bulk metallic glass-forming liquid

Effect of Preparation Method on TEM Specimen

Enhancement of Strength and Corrosion Resistance of Copper Wires by Metallic Glass Coating

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