A5004017192- Metallic Glasses and Amorphous Alloys
- Phase-change materials and chalcogenides
- Material Dynamics and Properties
- Glass properties and applications
- High Entropy Alloys Studies
- Nanomaterials for catalytic reactions
- Advanced Adaptive Filtering Techniques
- Direction-of-Arrival Estimation Techniques
- Theoretical and Computational Physics
- Environmental remediation with nanomaterials
- Nanoporous metals and alloys
- Antenna Design and Optimization
- Blind Source Separation Techniques
- Microstructure and Mechanical Properties of Steels
- Electric Vehicles and Infrastructure
- High-Temperature Coating Behaviors
- Thermodynamic and Structural Properties of Metals and Alloys
- Anodic Oxide Films and Nanostructures
- Iron and Steelmaking Processes
- Radar Systems and Signal Processing
- Nanofabrication and Lithography Techniques
- Iron oxide chemistry and applications
- Magnetic Properties and Applications
- Supercapacitor Materials and Fabrication
- Advanced materials and composites
Tsinghua University
2006-2025
Shanghai University of Finance and Economics
2021
State Council of the People's Republic of China
2014
Aerospace Research Institute of Materials and Processing Technology
2007
University of California, Los Angeles
1986-2004
Chinese University of Hong Kong
2000
California State University Los Angeles
1986-1987
Abstract As a medium to understand the nature of glass transition, ultrastable glasses have garnered increasing attention for their significance in fundamental science and technological applications. Most studies produced through surface-controlled process using physical vapor deposition. Here, we demonstrate an approach accessing via glass-to-glass bulk transformation that is inherently free from size constraints anisotropy. The resulting exhibits significantly enhanced density (improved by...
The morphology and the degradation ability of three different materials (200 mg L<sup>−1</sup> DB6, 25 °C, initial pH = 7).
Fe-based multiphase nanocrystallized ribbons (CR-II) prepared by annealing of metallic glasses show unexpected high performance for Orange II degradation.
Synthesized from ultrafine particles with a bottom-up approach, nanoglasses are of particular importance in pursuing unique properties. Here, we design metallic nanoglass alloy two components ∼Cu64Sc36 and ∼Fe90Sc10 nanoglasses. With nanoalloying mutually immiscible Fe Cu, the properties alloys can be tuned by varying proportions component. This offers opportunity to create novel glass nanocomposites sheds light on building structure-property correlation for alloys.
We derive the exact pairwise error probability (PEP) for space-time coding over quasi-static Rayleigh fading channels in presence of spatial correlation. show that receive correlation always degrades PEP all signal-to-noise ratios (SNRs). quantify effect by employing notion "majorization". stronger correlation, worse SNRs. at low SNR, depending on codes, transmit can either improve or degrade performance. to guarantee robust performance arbitrary minimum eigenvalue codeword pair difference...
A long-standing issue of using molecular dynamics (MD) to simulate local atomic structures in nonequilibrium metals and alloys is the huge difference cooling rates used experimental studies theoretical calculations. In this study, a unique approach was introduced correct fast time steps involved MD This has demonstrated various medium-range ordered zones with imperfect packing, which are verified experimentally by high-resolution transmission electron microscopy its selected simulation...
Cu–Ag bimetallic porous nanomembranes, prepared by chemical dealloying assisted with ultrasonic vibration, exhibit thicknesses of ∼5 to 50 nm, pore diameters ∼10 20 nm and ligament feature sizes ∼30 nm.
A common understanding of plastic deformation metallic glasses (MGs) at room temperature is that such occurs via the formation runaway shear bands usually lead to catastrophic failure MGs. Here we demonstrate inhomogeneous flow nanoscale can evolve in a well-controlled manner without further developing bands. It suggested sample undergoes an elasto-plastic transition terms quasi steady-state localized shearing. During this transition, embryonic localization (ESL) propagates with very slow...
This paper presents a Markov chain random carrier frequency modulation (MRCFM) technique for suppressing sideband vibro-acoustic responses caused by discontinuous pulse-width (DPWM) in permanent magnet synchronous motors (PMSMs) new energy vehicles. Firstly, the spectral and order distributions of current harmonics radial electromagnetic forces introduced DPWM are characterized identified. Then, principle implementation method three-state number generation proposed, particle swarm...
Both experimental studies and molecular dynamics (MD) simulations reveal a unique atomic-scale growth mechanism during crystallization of an amorphous alloy Zr65Ni25Ti10. By using high-resolution transmission electron microscope incorporated with nanobeam diffraction technique, we have clearly seen imperfect ordered packing nano-ordered clusters (NOCs) size 1–2 nm embedded in this material. Under very large undercooling condition, NOCs essentially act as preexisting nuclei that can grow...
In this paper, the effect of stress and strain on bainitic transformation kinetics plasticity have been studied quantitatively by means experiments a Gleeble-1500 testing machine. It is concluded that applied stresses will promote evolution increase maximum volume fraction new phase value parameter. Moreover, predeformation due to affects both parameter with increasing stress; but it has little variation stresses.
With reference to experimental data, the effects of stress, chemical composition, and transformation temperature on bainitic kinetics are analysed. A decrease or an increase carbon equivalent results in a slow rate reduces promotive effect stress induced transformation. Moreover, relative unit kinetic parameter b Avrami equation for is found be 10-3 order magnitude, n (Avrami index) tends with temperature. comprehensive model depict dependent composition as well established.
Nanocrystals, with a body-centered-cubic crystal structure of lattice parameter 18.2525 Å , were found in amorphous Pd40.5Ni40.5P19 specimens that had been annealed at 628 K for 30 min. The surfaces are smooth and dislocations absent, suggesting the growth these nanocrystals is through two-dimensional nucleation mechanism (formation surface nuclei critical size their subsequent growth).
A Pd81Si19 bulk metallic glassy rod with a diameter of 4.5 mm was produced by water quenching the fluxed alloy. Despite negative heat mixing between Pd and Si elements very simple components constituting binary Pd–Si glass-forming system, structural heterogeneity induced either slow cooling liquid or sub-Tg annealing ribbons. The experiments evidenced that more ordered amorphous phase emerged from original matrix. Our work provides an alternative way to tune microstructure glasses subsequent...
Glassy ribbons of Pd–Si alloys were prepared by a combination melt spinning and flux treatment. The crystallization behaviour Pd81Si19 glassy alloy was studied through isothermal annealing at temperatures ranging lower than the glass-transition temperature T g to around onset crystallization. evolution microstructures arising from investigated X-ray diffraction (XRD) (high-resolution) transmission electron microscopy ((HR)TEM). XRD spectra showed that, after sample annealed sub-T...