Toughness enhancement and heterogeneous softening of a cryogenically cycled Zr–Cu–Ni–Al–Nb bulk metallic glass

Li, B.S.; Xie, Shenghui; Kruzic, Jamie J.

doi:10.1016/j.actamat.2019.07.012

Cited by 74 publications

(42 citation statements)

References 66 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%

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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%

“…In order to compare the effectiveness of excited liquid cooling with other BMG rejuvenation methods, we use the enthalpy of relaxation, ΔH rel, which has been reported in the majority of The technological motivation of the various techniques to rejuvenate metallic glasses is to improve mechanical properties. 10,[25][26][27] Therefore such methods, including our excited liquid cooling, must be practical in order to be used as a toughening strategy for metallic glass articles.…”

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%

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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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Unique Energy‐Storage Behavior Driven by High Entropy in Metallic Glasses

Wang,

Shi,

Shen

et al. 2024

Adv Funct Materials

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The rejuvenation or energy‐storage behavior in metallic glasses (MGs) has been extensively explored for its theoretical and practical significance. However, very limited research focuses on the rejuvenation of high entropy metallic glasses (HEMGs), leaving uncertainties about how configurational entropy influences this process. In this study, cryogenic temperature cycling (CTC) is utilized to unlock the rejuvenation potential of a series of La‐based MGs with different entropy values. Comparative analysis of these MGs reveals that increased entropy boosts the maximum rejuvenation degree from 37% to 65% and widens the range of energy states where rejuvenation occurs. The changed rejuvenation behavior induced by entropy increase, which has never been reported other studies, are related to glass's structures, fragility and coupling degree between β and α relaxations. Besides, a new rejuvenation mechanism is revealed in HEMGs, which differs significantly from unrestricted growth and interconnection of flow units observed in most MGs. The atomic motion in HEMGs is confined within the icosahedral backbone network during CTC. Surprisingly, this local motion can propagate through strong interactions between adjacent atoms, facilitating the activation of α relaxation. These discoveries offer novel approaches to tune energy‐storage behavior of MGs by modulating icosahedral network structures through entropy control.

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Toughness enhancement and heterogeneous softening of a cryogenically cycled Zr–Cu–Ni–Al–Nb bulk metallic glass

Cited by 74 publications

References 66 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

Unique Energy‐Storage Behavior Driven by High Entropy in Metallic Glasses

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