Relaxation Pathways in Metallic Glasses

Gallino, Isabella; Busch, Ralf

doi:10.1007/s11837-017-2573-6

Cited by 22 publications

(11 citation statements)

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“…Furthermore, characteristic time scales based on previous calorimetric enthalpy recovery studies (17) are reported with diamond symbols. These likely bear an intimate relation with different diffusivities previously identified in BMG (31,44).…”

Section: Vitrification Kinetics By Means Of Fictive Temperature Detersupporting

confidence: 53%

Vitrification decoupling from α-relaxation in a metallic glass

et al. 2020

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Understanding how glasses form, the so-called vitrification, remains a major challenge in materials science. Here, we study vitrification kinetics, in terms of the limiting fictive temperature, and atomic mobility related to the α-relaxation of an Au-based bulk metallic glass former by fast scanning calorimetry. We show that the time scale of the α-relaxation exhibits super-Arrhenius temperature dependence typical of fragile liquids. In contrast, vitrification kinetics displays milder temperature dependence at moderate undercooling, and thereby, vitrification takes place at temperatures lower than those associated to the α-relaxation. This finding challenges the paradigmatic view based on a one-to-one correlation between vitrification, leading to the glass transition, and the α-relaxation. We provide arguments that at moderate to deep undercooling, other atomic motions, which are not involved in the α-relaxation and that originate from the heterogeneous dynamics in metallic glasses, contribute to vitrification. Implications from the viewpoint of glasses fundamental properties are discussed.

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Section: Vitrification Kinetics By Means Of Fictive Temperature Detersupporting

confidence: 53%

Vitrification decoupling from α-relaxation in a metallic glass

et al. 2020

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“…The life cycle of glasses is closely associated with time. They are “born” upon cooling glass-forming liquids fast enough to avoid crystal nucleation ( 1 ) and will age with time via hierarchical dynamic relaxations ( 2 , 3 ), eventually going toward “death” with full crystallization. Intriguingly, as-quenched or aged glasses can structurally rejuvenate with external energy injection.…”

Section: Introductionmentioning

confidence: 99%

“…There is a natural competition between rejuvenation (disordering) and aging (ordering). This is because, in metastable glasses, aging is spontaneous ( 3 , 16 ) and sometimes can be accelerated by proper thermomechanical processing ( 17 , 18 ). Once it is balanced with the aging dynamics, structural disordering will be saturated ( 19 ), and thus rejuvenation ceases to further develop ( 5 ).…”

Section: Introductionmentioning

confidence: 99%

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Ultrafast extreme rejuvenation of metallic glasses by shock compression

Ding

Zaccone

et al. 2019

Sci. Adv.

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Structural rejuvenation of glasses not only provides fundamental insights into their complicated dynamics but also extends their practical applications. However, it is formidably challenging to rejuvenate a glass on very short time scales. Here, we present the first experimental evidence that a specially designed shock compression technique can rapidly rejuvenate metallic glasses to extremely high-enthalpy states within a very short time scale of about 365 ± 8 ns. By controlling the shock stress amplitude, the shock-induced rejuvenation is successfully frozen at different degrees. The underlying structural disordering is quantitatively characterized by the anomalous boson heat capacity peak of glasses. A Deborah number, defined as a competition of time scales between the net structural disordering and the applied loading, is introduced to explain the observed ultrafast rejuvenation phenomena of metallic glasses.

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“…Metallic glasses (MGs) are obtained by fast cooling from the melt to avoid crystallization and exhibit a disordered structure with higher-energy states [ 1 , 2 , 3 ]. As-cast MGs are thermodynamically metastable and can spontaneously convert to a lower energy state via aging (relaxation) [ 4 , 5 ]. However, many strategies can push MGs to undergo an opposite process and reach a more disordered state which is called rejuvenation.…”

Section: Introductionmentioning

confidence: 99%

Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses

et al. 2022

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One way to rejuvenate metallic glasses is to increase their free volume. Here, by randomly removing atoms from the glass matrix, free volume is homogeneously generated in metallic glasses, and glassy states with different degrees of rejuvenation are designed and further mechanically tested. We find that the free volume in the rejuvenated glasses can be annihilated under tensile or compressive deformation that consequently leads to structural relaxation and strain-hardening. Additionally, the deformation mechanism of highly rejuvenated metallic glasses during the uniaxial loading–unloading tensile tests is investigated, in order to provide a systematic understanding of the relaxation and strain-hardening relationship. The observed strain-hardening in the highly rejuvenated metallic glasses corresponds to stress-driven structural and residual stress relaxation during cycling deformation. Nevertheless, the rejuvenated metallic glasses relax to a more stable state but could not recover their initial as-cast state.

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Relaxation Pathways in Metallic Glasses

Cited by 22 publications

References 50 publications

Vitrification decoupling from α-relaxation in a metallic glass

Vitrification decoupling from α-relaxation in a metallic glass

Ultrafast extreme rejuvenation of metallic glasses by shock compression

Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses

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