Structural dynamics and rejuvenation during cryogenic cycling in a Zr-based metallic glass

Das, A.; Đufresne, Eric M.; Maaß, R.

doi:10.1016/j.actamat.2020.06.063

Cited by 52 publications

(13 citation statements)

References 39 publications

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“…achieved through thermal treatments such as the use of different cooling rates 5,41 , annealing protocols 2,40,46,49 , or mechanical treatments such as quasistatic mechanical loading [16][17][18][19][20] , plastic deformation 29,30,50,51 , thermal cycling [25][26][27][28] , shot peening 22 , and radiation damage [11][12][13][14][15] . Whereas thermal treatments enable the liquid BMG former to be affected before it freezes into a glass, with mechanical treatments, the glass itself is manipulated.…”

Section: Discussionmentioning

confidence: 99%

“…Recognizing such limitations in realizing a ductile state under BMG forming conditions has led to the development of processing strategies to enhance ductility after the glass has already been formed. Such strategies are based on mechanical means 10 and include irradiation [11][12][13][14][15] , static loading [16][17][18][19][20] , cyclic loading 21 , shot peening 22 , rolling 23 , twin roll casting 24 , thermal cycling [25][26][27][28] , and severe plastic deformation 29,30 . A summary of previous results can be found in the Supplementary Table 1.…”

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confidence: 99%

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Enhancing ductility in bulk metallic glasses by straining during cooling

et al. 2021

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Most of the known bulk metallic glasses lack sufficient ductility or toughness when fabricated under conditions resulting in bulk glass formation. To address this major shortcoming, processing techniques to improve ductility that mechanically affect the glass have been developed, however it remains unclear for which metallic glass formers they work and by how much. Instead of manipulating the glass state, we show here that an applied strain rate can excite the liquid, and simultaneous cooling results in freezing of the excited liquid into a glass with a higher fictive temperature. Microscopically, straining causes the structure to dilate, hence “pulls” the structure energetically up the potential energy landscape. Upon further cooling, the resulting excited liquid freezes into an excited glass that exhibits enhanced ductility. We use Zr44Ti11Cu10Ni10Be25 as an example alloy to pull bulk metallic glasses through this excited liquid cooling method, which can lead to tripling of the bending ductility.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Enhancing ductility in bulk metallic glasses by straining during cooling

et al. 2021

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“…[43][44][45] Relative to the BMG's as-cast structure, ductility or fracture toughness can be reduced 44,46,47 or enhanced. 5,48 This can be achieved through thermal treatments such as the use of different cooling rates, 5,41 annealing protocols, 2,40,46,49 or mechanical treatments such as quasistatic mechanical loading, [16][17][18][19][20] plastic deformation, 29,30,50,51 thermal cycling, [25][26][27][28] shot peening, 22 and radiation damage. [11][12][13][14][15] Whereas thermal treatments enable the liquid BMG former to be affected before it freezes into a glass, within mechanical treatments the glass itself is manipulated.…”

Section: Discussionmentioning

confidence: 99%

“…[7][8][9] Recognizing such limitations in realizing a ductile state under BMG forming conditions has led to the development of processing strategies to enhance ductility after the glass has already been formed. Such strategies are based on mechanical means, 10 and include irradiation, [11][12][13][14][15] static loading, [16][17][18][19][20] cyclic loading, 21 shot peening, 22 rolling, 23 twin roll casting, 24 thermal cycling, [25][26][27][28] and severe plastic deformation. 29,30 A summary of previous results can be found in the supplementary material in table 1.…”

Section: Introductionmentioning

confidence: 99%

Pulling Metallic Glasses Ductile

Ro¹,

Lund²,

Sohn³

et al. 2020

Preprint

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A major shortcoming of most known bulk metallic glasses (BMGs) is that they lack sufficient ductility, or toughness, when fabricated under conditions resulting in bulk glass formation. To address this, processing techniques to improve ductility that mechanically affect the glass have been developed, however it remains unclear for which BMG formers they work, and by how much. We show here that, instead of manipulating the glass state, an applied strain rate can excite the liquid, and simultaneous cooling results in freezing of the excited liquid into a glass with a higher fictive temperature. Microscopically, straining causes the structure to dilate, hence “pulling” the structure energetically up the potential energy landscape. Upon further cooling, the resulting excited liquid freezes into an excited glass that exhibits enhanced ductility. We use Zr44Ti11Cu10Ni10Be25 to demonstrate how pulling BMGs through this excited liquid cooling methods can lead to a tripling of the bending ductility.

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“…However, their embrittlement at the room temperature restricts their potential applications in the industries [5][6][7] . To tackle this problem, it was suggested to excite the atomic structure of glassy alloys, namely rejuvenation, leading to the higher energy state with the better plasticity 8,9 . Several rejuvenating methods have been proposed by researchers to improve the energy state and the ductility of amorphous alloys [10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Combined Effects of Annealing and Cyclic Loading on Structural Rejuvenation and Mechanical Properties of CuZr Metallic Glass: A Molecular Dynamics Study

Anggono¹,

Mahmoud

Suksatan

et al. 2022

Mat. Res.

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Structural rejuvenation is one of the key topics in the field of metallic glasses (MGs). In this work, we evaluated the combined effects of annealing treatment and elastic cyclic loading to discover pathways for promoting structural rejuvenation and improving the mechanical properties in the MGs. Using molecular dynamics (MD) simulations, it was revealed that the sole cyclic loading led to the increase of rejuvenation degree; however, a saturated state was observed upon the 40 th cycle. On the other side, the sample exposed to the combined treatment exhibited a slight relaxation at the first step of cycling process and then a sharp rejuvenation degree was detected in the material. The thorough analyses indicated that the change in the fraction of coordination polyhedrons at the relaxation stage was the main reason for the extra rejuvenation in the sample exposed to the combined treatments. The results also suggest that the combination of rejuvenation treatments improves the magnitude of rejuvenation in the amorphous alloys. It should be noted that the increase of rejuvenation in the alloying systems accompanied with a reduction in the tensile strength and an enhancement in the homogenous plastic deformation.

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Structural dynamics and rejuvenation during cryogenic cycling in a Zr-based metallic glass

Cited by 52 publications

References 39 publications

Enhancing ductility in bulk metallic glasses by straining during cooling

Enhancing ductility in bulk metallic glasses by straining during cooling

Pulling Metallic Glasses Ductile

Combined Effects of Annealing and Cyclic Loading on Structural Rejuvenation and Mechanical Properties of CuZr Metallic Glass: A Molecular Dynamics Study

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