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Mechanical relaxation in a Zr-based bulk metallic glass: Analysis based on physical models
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10.1063/1.4745019
/content/aip/journal/jap/112/3/10.1063/1.4745019
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/3/10.1063/1.4745019

Figures

Image of FIG. 1.
FIG. 1.

Normalized storage modulus G′/Gu and loss modulus G′′/Gu in Zr55Cu30Ni5Al10 bulk metallic glass as a function of temperature. is the unrelaxed modulus, assumed to be equal to G′ at room temperature. Measurement frequency is 0.3 Hz and heating rate is 3 K/min. Tα corresponds to main or α relaxation temperature.

Image of FIG. 2.
FIG. 2.

Normalized loss modulus G′′/Gmax in different bulk metallic glasses (Cu46Zr46Al7Dy1, Zr55Cu30Ni5Al10, and Cu38Zr46Al8Ag8) as a function of temperature. Measurement frequency is 0.3 Hz and heating rate is 3 K/min. Inset corresponds to a logarithmic plot of G′′/Gmax. Data corresponding to Cu-based BMG have been obtained in our laboratory (unpublished work).

Image of FIG. 3.
FIG. 3.

Dependence of the normalized loss modulus G′′/G u in Zr55Cu30Ni5Al10 bulk metallic glass as a function of frequency at different temperatures (652-655-658-661…715 K).

Image of FIG. 4.
FIG. 4.

Master curves of the storage modulus G′/G u and the loss modulus G′′/G u in Zr55Cu30Ni5Al10 bulk metallic glass. Reference temperature is 691 K.

Image of FIG. 5.
FIG. 5.

Comparison of the fitting curves by a single Debye relaxation time and the experimental results for Zr55Cu30Ni5Al10 bulk metallic glass: (a) the storage modulus G′/G u and (b) the loss modulus G′′/G u .

Image of FIG. 6.
FIG. 6.

Loss modulus G′′/G u versus frequency for the temperature ranges from 697 K to 715 K (data from Fig. 3). Solid lines are the fits by the KWW model. Inset is the master curve of the loss modulus G′′/G u (experimental points) fitted by the KWW equation (solid line) and the Kohlrausch exponent  = 0.4981.

Image of FIG. 7.
FIG. 7.

The master curve of the loss modulus G′′/G u fitted by the HN equation in Zr55Cu30Ni5Al10 bulk metallic glass.

Image of FIG. 8.
FIG. 8.

Plots of f peak of the loss modulus G′′/G u vs. T peak in Zr55Cu30Ni5Al10 and Cu38Zr46Al8Ag8 bulk metallic glasses in isothermal modes.

Image of FIG. 9.
FIG. 9.

Influence of the driving frequency on the logarithm of the loss factor at various temperatures in the Zr55Cu30Ni5Al10 bulk metallic glass. Solid lines are the fits by Eq. (15).

Image of FIG. 10.
FIG. 10.

Evolution of the correlation factor χ with the temperature in Zr55Cu30Ni5Al10 bulk metallic glass.

Image of FIG. 11.
FIG. 11.

The loss modulus G′′/G u versus frequency for the temperature ranges from 697 K to 715 K (data from Fig. 3). Solid lines are the fits by the QPD model. Inset is the master curve of the loss modulus G′′/G u (experimental points) fitted by the QPD equation (solid line) and the Kohlrausch exponent  = 0.38.

Image of FIG. 12.
FIG. 12.

Plot of ln(tanδ) as a function of temperature for Zr55Cu30Ni5Al10 bulk metallic glass. The solid line is the fit by Eqs. (18) and (19).

Tables

Generic image for table
Table I.

Parameters of Vogel-Fulcher-Tamman expression for typical bulk metallic glasses and fragility. Compared with other bulk metallic glasses: Zr46.75Ti8.25Cu7.5Ni10Be27.5 (Ref. 5), Pd40Ni10Cu30P20 (Ref. 6), and La60Ni15Al25 (Ref. 49), Zr65Cu15Ni10Al10 (Ref. 50), La55Al25Cu10Ni5Co5 (Ref. 51), and Pd40Ni40P20 (Ref. 52).

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/content/aip/journal/jap/112/3/10.1063/1.4745019
2012-08-09
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mechanical relaxation in a Zr-based bulk metallic glass: Analysis based on physical models
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/3/10.1063/1.4745019
10.1063/1.4745019
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