A5053984770- Metallic Glasses and Amorphous Alloys
- Material Dynamics and Properties
- Glass properties and applications
- Theoretical and Computational Physics
- Phase-change materials and chalcogenides
- Magnetic properties of thin films
- Cultural Heritage Materials Analysis
- Magnetic Properties of Alloys
- Semiconductor materials and interfaces
- Electromagnetic wave absorption materials
- nanoparticles nucleation surface interactions
- Magnetic and transport properties of perovskites and related materials
- Silicon and Solar Cell Technologies
- Planetary Science and Exploration
- Magnetic Properties and Applications
- Microstructure and mechanical properties
- Intermetallics and Advanced Alloy Properties
- Advanced Condensed Matter Physics
- Quasicrystal Structures and Properties
- Nanomaterials and Printing Technologies
- Surface Roughness and Optical Measurements
- Photonic Crystals and Applications
- Laser Material Processing Techniques
- Astro and Planetary Science
- Thin-Film Transistor Technologies
Kunming Children's Hospital
2024-2025
Nanjing University of Science and Technology
2025
Shanxi Normal University
2025
Chinese Academy of Sciences
2013-2024
University of Chinese Academy of Sciences
2016-2024
Songshan Lake Materials Laboratory
2018-2024
Institute of Physics
2015-2024
China University of Mining and Technology
2024
Czech Academy of Sciences, Institute of Physics
2019-2024
Northwest University
2024
The mechanisms of plastic deformation glassy solids and structural origin $\ensuremath{\beta}$ relaxation are two fundamental issues. We provide compelling experimental evidence that the activation shear transformation zones (STZs) relaxations in metallic glasses directly related, energy potential-energy barriers STZs nearly equivalent. Our results suggest an intrinsic correlation among potential STZs, relaxation, inhomogeneous atomic structure glasses, which has implications for...
We report a close correlation between the dynamic behavior of serrated flow and plasticity in metallic glasses (MGs) show that plastic deformation ductile MGs can evolve into self-organized critical state characterized by power-law distribution shear avalanches. A stick-slip model considering interaction multiple bands is presented to reveal complex scale-free intermittent shear-band motions quantitatively reproduce experimental observations. Our studies have implications for understanding...
Metallic glasses are commonly brittle, as they generally fail catastrophically under uniaxial tension. Here we show pronounced macroscopic tensile plasticity achieved in a La-based metallic glass which possesses strong $\ensuremath{\beta}$ relaxations and nanoscale heterogeneous structures. We demonstrate that the relaxation is closely correlated with activation of structural units plastic deformations global plasticity, transition from brittle to ductile tension follow similar...
Abstract With sufficient high cooling rates, a variety of liquids, including metallic melts, will cross glass transition temperature and solidify into accompanying marked increase the shear viscosity in approximately 17 orders magnitude. Because intricate atomic structure dynamic behaviours liquid, it is yet difficult to capture underlying structural mechanism responsible for slowing down during transition, which impedes deep understanding formation nature glasses. Here, we report that...
Abstract Focusing on metallic glasses as model systems, we review the features and mechanisms of β-relaxations, which are intrinsic universal to supercooled liquids glasses, demonstrate their importance in understanding many crucial unresolved issues glassy physics materials science, including glass transition phenomena, mechanical properties, shear-banding dynamics deformation mechanisms, diffusion breakdown Stokes–Einstein relation well crystallization stability glasses. We illustrate that...
A mandrel winding method, which can realize remarkable homogeneous plastic deformation at room temperature for various metallic glasses, is applied to characterize flow units and study their relationship with macroscopic deformations relaxations. The method provide information on the activation energy, time, size, intrinsic relaxation distribution, density of units. We find plasticity a glass be controlled through modulating features results have benefits better understanding structural...
The prediction of the glass-forming ability (GFA) by varying composition alloys is a challenging problem in glass physics, as well for industry, with enormous financial ramifications. Although different empirical guides GFA were established over decades, comprehensive model or approach that able to deal many variables possible simultaneously efficiently predicting good formers still highly desirable. Here, applying support vector classification method, we develop models binary metallic from...
High saturation magnetic flux density (Bs ) of soft materials is essential for increasing the power modern devices and motor machines. Yet, Bs always at expense high coercivity (Hc ), presenting a general trade-off in material family. Here, superior comprehensive properties, i.e., an exceptionally up to 1.94 T Hc as low 4.3 A m-1 are unprecedentedly combined FeCo-based alloy. This alloy obtained through composition design strategy construct transitional microstructure between amorphous...
We characterize and identify the flow units in two typical metallic glasses (MGs), which have markedly different β-relaxation behaviors mechanical properties. The viscoelastic hysteresis loops are found cyclic deformation nominal elastic regime of glasses. show that related to activation glasses, a model is proposed describe units. demonstrate both anelastic plastic structural origin
Out-of-plane, nanoscale periodic corrugations are observed in the dynamic fracture surface of brittle bulk metallic glasses with toughness approaching that silica glasses. A model based on meniscus instability and plastic zone theory is used to explain such crack instability. The results indicate local softening mechanism an essential ingredient for controlling formation unique corrugations, might provide a new insight into origin roughening materials.
We report a high entropy metallic glass of Zn20Ca20Sr20Yb20(Li0.55Mg0.45)20 via composition design that exhibiting remarkable homogeneous deformation without shear banding under stress at room temperature. The also shows properties such as low transition temperature (323 K) approaching temperature, density and specific strength, good conductivity, polymerlike thermoplastic manufacturability, ultralow elastic moduli comparable to bones. alloy is thermally chemically stable.
Upon cooling, glass-forming liquids experience a two-step relaxation associated to the cage rattling and escape from cage, following decoupling between \b{eta}- {\alpha}-relaxations. The found behaviors have greatly changed face of glassy physics materials studies. Here we report novel dynamic that function changes gradually single-step form as temperature declines through stress various metallic glasses in broad time range below glass transition (Tg). Such is unexpected state reveals modes...
Abstract Vitrification from physical vapor deposition is known to be an efficient way for tuning the kinetic and thermodynamic stability of glasses significantly improve their properties. There a general consensus that preparing stable requires use high substrate temperatures close glass transition one, T g . Here, we challenge this empirical rule by showing formation Zr-based ultrastable metallic (MGs) at room temperature, i.e., with temperature only 0.43 By carefully controlling rate, can...
The surface viscosity and self-diffusion of a Pd-based metallic glass were measured using annealing-induced decay its submicron gratings. Strong dynamics diffusion with the value more than 105 times faster bulk are found at temperatures below transition. high dynamic induces fast crystallization transition temperature free which is 100 that in bulk.
Glasses have markedly different stability around their glass transition temperature (Tg), and metallic glasses (MGs) are conventionally regarded as metastable compared to other such silicate or amber. Here, we show an aging experiment on a Ce-based MG its Tg (~0.85Tg) for more than 17 years. We find that the with strong fragility could transform into kinetic thermodynamic hyperstable state after long-term room exhibits resistance against crystallization. The achieved is closer ideal of MGs...
The prevalence of wide-bandgap (WBG) semiconductors allows modern electronic devices to operate at much higher frequencies. However, development soft magnetic materials with high-frequency properties matching the WBG-based remains challenging. Here, a promising nanocrystalline-amorphous composite alloy normal composition Fe75.5 Co0.5 Mo0.5 Cu1 Nb1.5 Si13 B8 in atomic percent is reported, which producible under industrial conditions, and shows an exceptionally high permeability frequencies up...
How glasses relax at room temperature is still a great challenge for both experimental and simulation studies due to the extremely long relaxation time-scale. Here, by employing modified molecular dynamics technique, we extend quantitative measurement of process metallic temperature. Both energy dynamics, low temperatures, follow stretched exponential decay with characteristic stretching exponent β = 3/7, which distinct from that supercooled liquid. Such aging originates release energy, an...