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Thermodynamic anomaly of the sub-T g relaxation in hyperquenched metallic glasses
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10.1063/1.4803136
/content/aip/journal/jcp/138/17/10.1063/1.4803136
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/17/10.1063/1.4803136

Figures

Image of FIG. 1.
FIG. 1.

Isobaric heat capacity ( ) versus temperature () for the annealed CuZrAl glass ribbons ( ) and the standard glasses ( ). and are, respectively, the liquid and the glass heat capacities. is the temperature, at which the release of the remnant excess energy starts, and is the temperature, at which = . The shadow areas (A and B) are used to determine using the enthalpy-matching method.

Image of FIG. 2.
FIG. 2.

The isobaric heat capacity ( ) versus temperature () for the CuZrAl glass ribbons cooled at 49 m/s, exhibiting the effect of the annealing temperature ( ) on the sub- relaxation pattern (the energy release behavior) for the duration of 1 h. The shaded area is the endothermic pre-peak of curve D relative to curve H.

Image of FIG. 3.
FIG. 3.

The isobaric heat capacity ( ) versus temperature () for the three HQ CuZrAl samples annealed at different temperatures ( ) below for 1 h. The three fresh samples were hyperquenched at (a) 35 m/s, (b) 25 m/s, and (c) 17 m/s, respectively. Insets: the relationship between the onset temperature of the exothermic peak ( ) and the annealing temperature ( ). For the curves without an exothermic peak, the peak temperature of the glass transition is used as in the insets.

Image of FIG. 4.
FIG. 4.

dependence of the remnant excess enthalpy, , for the CuZrAl samples cooled at 49 m/s and 25 m/s, respectively. The capitals near the curves correspond to those in Figs. 2 and 3(b) , respectively. Shaded area: the critical fictive temperature range ( ), in which the abnormal sub- ERP occurs.

Image of FIG. 5.
FIG. 5.

The isobaric heat capacity ( ) versus temperature () for the three HQ LaAlNi samples annealed at different temperatures ( ) below for 1 h. The three fresh samples were hyperquenched at (a) 25 m/s, (b) 35 m/s, and (c) 44 m/s, respectively. Insets: the relationship between and . For the curves without an exothermic peak, the peak temperature of the glass transition is used as in the insets.

Image of FIG. 6.
FIG. 6.

The dependence of the activation energy for the onset of the excess enthalpy release of the LaAlNi sample relative to that of the standard glass. The activation energy for the standard sample is taken from Ref. . The dashed line is the guide for eyes. The dotted line represents the generally expected trend. Shaded area: the critical fictive temperature range ( ), in which the abnormal decrease in occurs.

Image of FIG. 7.
FIG. 7.

The DSC curves for the HQ CuZrAl glass ribbons quenched at 12 m/s. (a) Influence of the annealing temperature ( ) for 1 h on the sub- EPR. Inset: dependence of the onset temperature ( ) of the sub- ERP (on the curves). (b) Influence of the annealing temperature ( ) for 1 h on the crystallization peaks (on the DSC output– curves). Inset: crystallization behavior of the samples quenched at 25 m/s for a comparison.

Image of FIG. 8.
FIG. 8.

Fragility diagram of the LaAlNi liquids. Dashed lines: fits of the viscosity () data for both low and high temperature regions to the MYEGA equation. Solid curve: fit of the viscosity data to Eq. (2) . refers to the temperature where the fragile and the strong terms have an equal time scale during the F-S transition.

Tables

Generic image for table
Table I.

The values for the HQ glass ribbons cooled at different rates and the correlation factors representing the linear fitting quality of the relationship between ln and 1/ in Eq. (1) .

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/content/aip/journal/jcp/138/17/10.1063/1.4803136
2013-05-07
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thermodynamic anomaly of the sub-Tg relaxation in hyperquenched metallic glasses
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/17/10.1063/1.4803136
10.1063/1.4803136
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