Analysis of thermal stability of amorphous phases in Al87Ni8Gd5 and Al87Ni8Y5 metallic alloys

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Abstract

Differential scanning calorimetry and X-ray diffraction analysis were used to study the kinetics of the formation of nanophase composites and the evolution of their structural parameters in the Al87Ni8Gd5 and Al87Ni8Y5 metallic glasses with different thermal stability during heating at a rate of 0.083 K/s. Using an original and a number of available models, quantitative changes in the nucleation and growth rates of Al nanocrystals and as well as the kinetic (diffusion coefficients) and thermodynamic (work for the formation of critical nuclei, difference of thermodynamic potentials of amorphous and crystalline phases, and specific free energy of nucleus/matrix phase interface) parameters were determined. A comparative analysis allowed to find that the main reason for the higher thermal stability of the Al87Ni8Y5 glass as compared to that of the Al87Ni8Gd5 glass is the lower diffusion mobility of atoms.

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About the authors

E. A. Sviridova

Galkin Donetsk Institute for Physics and Engineering; Donbas National Academy of Civil Engineering and Architecture (DonNACEA)

Author for correspondence.
Email: ksvir@list.ru
Russian Federation, Donetsk, 283048; Makeevka, 286123

S. V. Vasiliev

Galkin Donetsk Institute for Physics and Engineering; Donbas National Academy of Civil Engineering and Architecture (DonNACEA)

Email: ksvir@list.ru
Russian Federation, Donetsk, 283048; Makeevka, 286123

V. I. Tkatch

Galkin Donetsk Institute for Physics and Engineering

Email: ksvir@list.ru
Russian Federation, Donetsk, 283048

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Supplementary files

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2. Fig. 1. Fragments of DSC thermograms in the temperature ranges of the first stage of crystallization of metallic glasses Al87Ni8Gd5 (solid line) and Al87Ni8Y5 (dashed line) during heating at a rate of 0.083 K/s.

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3. Fig. 2. Diffraction patterns of rapidly cooled Al87Ni8Gd5 and Al87Ni8Y5 alloy tapes subjected to heating to temperatures of nanocrystallization completion (527 and 536 K, respectively). The dashed lines show the scheme of profile decomposition into amorphous and crystalline components.

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4. Fig. 3. Changes in the average sizes of Al nanocrystals in Al87Ni8Gd5 (●) and Al87Ni8Y5 (■) glasses during heating at a rate of 0.083 K/s. Points are the experiment, lines are the calculations according to equation (6).

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5. Fig. 4. Changes in the fraction of the nanocrystalline phase in Al87Ni8Gd5 (●) and Al87Ni8Y5 (■) glasses during heating at a rate of 0.083 K/s. Solid symbols indicate X-ray estimates, hollow symbols indicate normalized DSC data.

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6. Fig. 5. Temperature dependences of effective diffusion coefficients controlling the growth of nanocrystals in Al87Ni8Gd5 (solid curve) and Al87Ni8Y5 (dashed curve) glasses. The vertical segments show the temperatures of the onset of nanocrystallization.

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7. Fig. 6. Determined from experimental data Jexp(T) (points) and calculated changes in the nucleation rate Jst of Al nanocrystals in Al87Ni8Gd5 (○ and solid line) and Al87Ni8Y5 (□ and dashed line) glasses upon heating at a rate of 5 K/min.

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8. Fig. 7. Changes in the thermodynamic driving force of Al nucleation in amorphous alloys Al87Ni8Gd5 (solid lines) and Al87Ni8Y5 (dashed lines). The vertical corresponding lines show the temperatures Tons and Tend at a heating rate of 0.083 K/s.

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9. Fig. 8. Changes in the work of formation of critical nuclei, estimated using relation (11) (symbols) and calculated using equation (7), in Al87Ni8Gd5 (○ and solid lines) and Al87Ni8Y5 (□ and dashed lines) glasses upon heating at a rate of 0.083 K/s. The vertical lines show the temperatures of the main maxima of Jexp (Fig. 6).

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10. Fig. 9. Temperature dependences of the specific free energy of the interface between the crystalline and amorphous (liquid) phases in Al-based alloys: 1 and 2 – Al87Ni8Gd5 and Al87Ni8Y5, respectively, the results of this work, 3 – Al87Ni8Gd5, deformation-induced crystallization [38] taking into account the pressure, 4 – Al85Ce8Ni5Co2 [39], calculation using the approximate model [32]. The asterisk indicates the experimentally estimated value for pure Al [24].

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11. Fig. 10. Changes in the growth rate of Al nanocrystals in Al87Ni8Gd5 (solid line) and Al87Ni8Y5 (dashed line) glasses upon heating at a rate of 0.083 K/s. The vertical lines 1 and 2 indicate the crystallization onset temperatures.

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