Two-step annealing induced structural rejuvenation: A cause for memory effect in metallic glasses

Qiu, Keqiang; Wang, X.D.; Xu, Tianning; Cao, Qing; Ding, Shuting; Zhang, D.X.; Beyer, Kevin A.; Jiang, Jianjun

doi:10.1016/j.mtphys.2022.100824

Cited by 3 publications

(3 citation statements)

References 55 publications

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“…Although the samples show a variation of these two parameters, a clear relation to the annealing temperatures could not be found, because as evidently seen in the three chosen recrystallization curves, the intermediate annealing temperature yields the longest induction time. Nevertheless, it is quite well known that these two parameters can scatter in a vast range for defined crystallization parameters. − …”

Section: Resultsmentioning

confidence: 99%

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Memory Effect by Melt Crystallization Observed in Polymorphs of a Benzothieno-Benzothiophene Derivative

James,

Greco,

Devaux

et al. 2023

Crystal Growth & Design

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This work provides a comprehensive illustration of a crystalline melt memory effect recorded for three solvates of the 2,7-bis(2-(2-methoxyethoxy)ethoxy)benzo[b]benzo [4,5] thieno [2,3-d]thiophene (OEG-BTBT) molecule with dichloromethane (DCM) molecules. Combined optical microscopy and X-ray diffraction measurements at different temperatures are used to get an overview of the structural and morphological properties like melting points, isotropic transition temperatures, induction times, and crystallization kinetics of the three forms. An outstanding observation is made upon annealing the three polymorphs at temperatures well above their respective melting points as well as above the optical clearance temperature. After cooling back to room temperature, recrystallization results in the formation of the initial phase present before the annealing process. This melt memory effect is observed for all three solvates. These observations can be correlated to the strong interaction between the DCM molecules and the oligoethylene glycol side chains, even in the molten state. This conclusion rationalizes the experimental observation made upon solvent vapor annealing of the crystalline sample with DCM, which unambiguously transformed the system into a disordered state.

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Section: Resultsmentioning

confidence: 99%

“…Nevertheless, it is quite well known that these two parameters can scatter in a vast range for defined crystallization parameters. 34 − 36 …”

Section: Resultsmentioning

confidence: 99%

Memory Effect by Melt Crystallization Observed in Polymorphs of a Benzothieno-Benzothiophene Derivative

James,

Greco,

Devaux

et al. 2023

Crystal Growth & Design

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“…1a ). The convergence of the two memory effects stems from their common structural origin, as the classical Kovacs memory effect also may arise from the recovery of reversible loosely packed regions 56 , 57 .…”

Section: Discussionmentioning

confidence: 99%

Strain-driven Kovacs-like memory effect in glasses

Tong,

Song,

Gao

et al. 2023

Nat Commun

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Studying complex relaxation behaviors is of critical importance for understanding the nature of glasses. Here we report a Kovacs-like memory effect in glasses, manifested by non-monotonic stress relaxation during two-step high-to-low strains stimulations. During the stress relaxation process, if the strain jumps from a higher state to a lower state, the stress does not continue to decrease, but increases first and then decreases. The memory effect becomes stronger when the atomic motions become highly collective with a large activation energy, e.g. the strain in the first stage is larger, the temperature is higher, and the stimulation is longer. The physical origin of the stress memory effect is studied based on the relaxation kinetics and the in-situ synchrotron X-ray experiments. The stress memory effect is probably a universal phenomenon in different types of glasses.

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Enhancing the Energy State and Plasticity of Relaxed Cu49Hf42Al9 Bulk Metallic Glass by Rejuvenation

Jia,

Liu,

Wang

et al. 2024

Met. Mater. Int.

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Two-step annealing induced structural rejuvenation: A cause for memory effect in metallic glasses

Cited by 3 publications

References 55 publications

Memory Effect by Melt Crystallization Observed in Polymorphs of a Benzothieno-Benzothiophene Derivative

Memory Effect by Melt Crystallization Observed in Polymorphs of a Benzothieno-Benzothiophene Derivative

Strain-driven Kovacs-like memory effect in glasses

Enhancing the Energy State and Plasticity of Relaxed Cu49Hf42Al9 Bulk Metallic Glass by Rejuvenation

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