Properties of high-density, well-ordered, and high-energy metallic glass phase designed by pressurized quenching

Miyazaki, Narumasa; Lo, Yu‐Chieh; Wakeda, Masato; Ogata, Shigenobu

doi:10.1063/1.4962128

Cited by 15 publications

(5 citation statements)

References 27 publications

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“…Based on conventional free volume theory, the number of full icosahedra (FI) decreases in the less-relaxed state, which is usually realized by rapid cooling [ 7 , 8 ]. It is pointed that the number of full icosahedra increases with increasing pressure and the formed MG becomes denser, as expected [ 13 ]. More importantly, the atomic structure is remarkably mediated in virtue of pressure, which is identified by the Voronoi tessellation analysis.…”

Section: Introductionsupporting

confidence: 79%

“…It is well known that the mechanical properties of the MGs are dependent on their internal structure, which may be influenced by changing the processing history, such as using different cooling rate for MG preparation [ 5 , 6 , 7 ]. Recently, some researchers have found that MGs obtained under high hydrostatic pressure possessed a high-density, are well-ordered, and possess a high-energy metallic glass phase which contradicts the common understanding of MGs [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. While the relationship between the pressure and the internal structure is not well understood, and the mechanisms of shear band formation and propagation in pressured MGs are rarely discussed.…”

Section: Introductionmentioning

confidence: 97%

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Plastic Deformation of Pressured Metallic Glass

et al. 2017

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Although pressured metallic glass (MG) has been reported in the literature; there are few studies focusing on pressure effects on the structure; dynamics and its plastic deformation. In this paper; we report on and characterize; via molecular dynamics simulation, the structure and dynamics heterogeneity of pressured MGs, and explore a causal link between local structures and plastic deformation mechanism of pressured glass. The results exhibit that the dynamical heterogeneity of metallic liquid is more pronounced at high pressure, while the MGs were less fragile after the release of external pressure, reflected by the non-Gaussian parameter (NGP). High pressure glass shows better plastic deformation; and the local strain zone distributed more uniformly than of in normal glass. Further research indicates that although the number of icosahedrons in pressured glass was much larger than that in normal glass, while the interpenetrating connections of icosahedra (ICOI) exhibited spatial correlations were rather poor; In addition, the number of ‘fast’ atoms indexed by the atoms’ moving distance is larger than that in normal glass; leading to the sharp decreasing in number of icosahedrons during deformation. An uniform distribution of ‘fast’ atoms also contributed to better plastic deformation ability in the pressured glass. These findings may suggest a link between the deformation and destruction of icosahedra with short-range order.

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Section: Introductionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 97%

Plastic Deformation of Pressured Metallic Glass

et al. 2017

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“…Previous reports have claimed the creation of a wellordered local structure but a glass in a high potential energy state was revealed by a high-pressure heat treatment in simulation 7,8 . Thus far, it has been difficult to discuss the real glassy nature of the high-pressure heat-treated alloy.…”

Section: Creation Of a New Type Of Hidden Anomalous Metallic Glassmentioning

confidence: 91%

“…The pressureinduced liquid-to-liquid transition was suggested by Dmowski et al in Zr-based metallic glasses 6 . In molecular dynamic (MD) simulation studies, polymorphic transitions and the creation of new types of abnormal glass through high-pressure heat treatment was predicted (i.e., a high-energy but high-density and well-ordered glass 7,8 ). Thus far, there have been attempts to explain these types of transitions and phenomena using many theoretical models (e.g., 4f electron delocalization 1-5 , P-and N-type free volume 8,9 , and a two-order-parameter model 10,11 ).…”

Section: Introductionmentioning

confidence: 99%

Unveiling a new type of ultradense anomalous metallic glass with improved strength and ductility through a high-pressure heat treatment

et al. 2019

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An anomalous glass was discovered through high-pressure heat treatment (5.5 GPa at 850 K) followed by rapid cooling of a Zr 50 Cu 40 Al 10 metallic glass. Despite a reduction in the crystallization temperature and enthalpy, high-resolution transmission electron microscopy analysis revealed that the collected bulk sample maintained a fully amorphous structure. The density of the sample was 0.6% larger than that of the as-cast state and was even larger than that of the partially crystallized state. These results suggest the formation of an ultradense packing glass that cannot be obtained through conventional annealing. Compression test results indicated a significant increase in the Young's modulus and fracture strength, supporting the creation of an anomalous metallic glass. In addition, plasticity was observed in the treated sample. It was therefore concluded that the high-pressure heat treatment enabled the creation of a new type of glass that is normally overshadowed by the crystallized phase at atmospheric pressure. We explained the creation of the ultradense glass by introducing a pressure parameter (P) to the conventional volume (v) -temperature (T) diagram.

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“…[10,11] By applying pressurized quenching to a Zr-based metallic glass, a high-energy glass phase comparable to typical high-energy glass produced by rapid cooling was obtained. [12] Moreover, it is well known that structural relaxation of metallic glasses proceeds during thermal annealing processes at a temperature below the glass transition temperature 𝑇 g , which is a structural ordering process and densifies atomic packing and reconfigures the atomic structure to a low-energy state, since there is a lack of volume-generating mechanisms at high temperatures. [13,14] Relaxation usu-ally hardens and embrittles MGs, but can improve the soft magnetic properties of as-cooled Fe-based MGs.…”

mentioning

confidence: 99%

High Mixing Entropy Enhanced Energy States in Metallic Glasses

Huo

Zang

et al. 2022

Chinese Phys. Lett.

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Owing to the nonequilibrium nature, the energy state of metallic glasses (MGs) can vary a lot and has a critical influence on the physical properties. Exploring new methods to modulate the energy state of glasses and studying its relationship with properties have attracted great interests. Herein, we systematically investigate the energy state, mixing entropy and physical properties of Zr–Ti–Cu–Ni–Be multicomponent high entropy MGs by experiments and simulations. We find that the energy state increases along with the increase of mixing entropy. The yield strength and thermal stability of MGs are also enhanced by high mixing entropy. These results may open a new door on regulation of energy states and thus physical properties of MGs.

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Properties of high-density, well-ordered, and high-energy metallic glass phase designed by pressurized quenching

Cited by 15 publications

References 27 publications

Plastic Deformation of Pressured Metallic Glass

Plastic Deformation of Pressured Metallic Glass

Unveiling a new type of ultradense anomalous metallic glass with improved strength and ductility through a high-pressure heat treatment

High Mixing Entropy Enhanced Energy States in Metallic Glasses

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