Micromechanism for Metallic-Glass Formation by Solid-State Reactions

Schröder, H.; Samwer, K.; Köster, Uwe

doi:10.1103/physrevlett.54.197

Cited by 231 publications

(45 citation statements)

References 11 publications

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“…3(b) and 4(c)), which requires specific kinetic parameters of m, β KWW , and x. This is quite different from the crystal-transformed amorphous solids reported in earlier studies, [6][7][8][9][10] where incomplete glass transition in the upscan DSC curves was shown, 6 featured by broader transition width 9 or twisted transition profiles. 10 It is also seen in Fig.…”

mentioning

confidence: 74%

“…[http://dx.doi.org/10.1063/1.4979352] Amorphization occurs in many materials such as metals, molecules, and oxides from melt quenching and damaged crystals. [1][2][3][4] Usually, the amorphous materials prepared by damaged crystals 5 using techniques such as mechanical alloying, 6 high pressure, 7 and solid state reactions 8 have poor thermal stability against crystallization. 9,10 This makes it difficult to achieve explicit identification of the glass transition in the amorphous materials initiated by crystal-damage.…”

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confidence: 99%

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Communication: Enthalpy relaxation in a metal-organic zeolite imidazole framework (ZIF-4) glass-former

Liu

Tian

et al. 2017

The Journal of Chemical Physics

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Amorphization in metal-organic framework materials initiated by the collapsed crystal offers new access to glasses; however, the understanding of such glasses remains to be clarified. Here, we studied the glass transition thermodynamics and kinetics in a zeolitic imidazolate framework ZIF-4 utilizing enthalpy relaxation measurements. The calorimetric glass transition profile and relaxation behaviors in ZIF-4 are found to reproduce the basic features and correlations manifested by conventional melt-quenched glasses. A comparison with various melt-quenched glasses suggests that the low fragility of ZIF-4 is ascribed to the low thermal-pressure coefficient due to the directional tetrahedral bond, partly leading to the low vibrational entropy in the melt-crystal entropy difference.

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confidence: 74%

mentioning

confidence: 99%

Communication: Enthalpy relaxation in a metal-organic zeolite imidazole framework (ZIF-4) glass-former

Liu

Tian

et al. 2017

The Journal of Chemical Physics

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“…that the amorphous interlayer growing from the interfaces expanded with different speeds towards the two constituent metals. Such an asymmetric growth behaviour has been observed by MD simulations and/or experiments in several binary systems [11][12][13][14]. Based on the previously reported data, it seemed to suggest that the amorphous interlayer grew faster towards a metal with a lower melting temperature, e.g.…”

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confidence: 79%

Critical Solid Solubility of the Ni-Ti System Determined by Molecular Dynamics Simulation and Ion Mixing

Lai

Cheng

et al. 2001

phys. stat. sol. (b)

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From a realistic n-body potential of the Ni-Ti system, the critical concentrations of the Ni-and Tirich solid solutions were determined by molecular dynamics (MD) simulation to be 38 at% Ti and 15 at% Ni, respectively, beyond which a disordered atomic configuration was more stable than the respective crystalline solid solutions. It follows that the central composition range bounded by the critical solubilities, i.e. within 38-85 at% of Ti, can be considered as the glass-forming range of the system, which was confirmed by room temperature 200 keV xenon ion mixing of alternately deposited Ni-Ti multilayered films. Moreover, MD simulation of a Ni-Ti bilayer revealed that during the solid-state amorphization reaction, the growth of the amorphous interlayer followed exactly a t 1/2 law and grew faster towards the Ti lattice than to the Ni side. The physical origin of such an asymmetric behaviour was found to be due to a difference in critical solid solubilty of the constituent metals.

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“…For milling times Ͻ10 h the enthalpy release consists of contributions due to grain growth as well as the amorphization reaction. 10 The second break in the C p increase after a milling time of 8 h is correlated with the onset of the amorphization reaction. For milling times Ͼ11 h the final value of the C p increase at 12% is similar to the observations made on binary Zr-Al alloys.…”

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confidence: 99%

Glass formation in a multicomponent Zr-based alloy by mechanical attrition and liquid undercooling

Sagel

Wunderlich

Perepezko

et al. 1997

Applied Physics Letters

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The synthesis of a multicomponent Zr 60 Al 10 Ni 9 Cu 18 Co 3 glass by mechanical alloying has been investigated using thermal and structural analysis and compared with a metallic glass produced by liquid undercooling. The solid-state amorphization reaction is preceded by rapid solution of smaller solute atoms in the Zr matrix with a concomitant reduction in grain size to 10 nm at the amorphization onset. A fully amorphous mechanically alloyed sample shows relaxation compared to a sample synthesized by liquid cooling probably due to removal of residual inhomogeneities on the scale of the nanocrystal size at amorphization. While the kinetic pathways for the two synthesis methods differ, the relaxed amorphous phases from each method exhibit identical thermodynamic properties. © 1997 American Institute of Physics. ͓S0003-6951͑97͒01705-1͔Glasses can be obtained by several routes including ͑i͒ incorporating static disorder into a crystalline phase mixture through solid-state processes or ͑ii͒ freezing in dynamic disorder through sufficient undercooling of the liquid at a composition outside the polymorphous melting temperature T 0 . 1 The equivalence of the amorphous state achieved by the two pathways is of interest in terms of the evolution of the amorphization ͑am͒ processes. This issue is addressed in the present study by examining the structural and thermal properties of a multicomponent Zr 60 Al 10 Ni 9 Cu 18 Co 3 glass, which is representative of a wider class of new alloys. 2 Multicomponent Zr-based alloys have recently been shown to produce bulk glassy metals at liquid cooling rates as low as 1-500 K/s. 3,4 While all of the factors responsible for the easy glass formation have not been fully identified, it is evident that multicomponent interactions can be important. 5,6 In the present work, powder samples synthesized by mechanical alloying ͑MA͒ are compared with liquid-quenched samples of the same composition.Elemental powders of 99.99% purity with the composition Zr 60 Al 10 Ni 9 Cu 18 Co 3 were mechanically alloyed under a high purity Ar atmosphere in a Spex ball mill with a powderto-ball ratio of 6:1. 7 After 36 h of ball milling, the oxygen and the Fe content were determined by EDX to be approximately 1 at. %. Liquid-quenched samples with about 50 m thickness were also produced in a splat quenching device. X-ray diffraction spectra ͑XRD͒ were obtained with an Enraf Nonius goniometer with a large-angle position sensitive detector ͑Inel CPS 120͒. Thermal analysis was performed with a Perkin Elmer DSC-7 in Al pans under purified Ar atmosphere. Temperature and specific heat calibrations were carried out with melting point and heat of fusion of indium and zinc.The XRD spectra taken at different stages of the milling process are characterized by the disappearance of the elemental Ni, Co, Cu, and Al peaks and a shift in the Zr ͑101͒ peak to higher 2⌰ values in Fig. 1͑a͒. From observations on binary powder mixtures, 7,8 this is indicative of the subsequent dissolution of Ni, Cu, Co, and Al in the Zr matrix with ...

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Micromechanism for Metallic-Glass Formation by Solid-State Reactions

Cited by 231 publications

References 11 publications

Communication: Enthalpy relaxation in a metal-organic zeolite imidazole framework (ZIF-4) glass-former

Communication: Enthalpy relaxation in a metal-organic zeolite imidazole framework (ZIF-4) glass-former

Critical Solid Solubility of the Ni-Ti System Determined by Molecular Dynamics Simulation and Ion Mixing

Glass formation in a multicomponent Zr-based alloy by mechanical attrition and liquid undercooling

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