A5103063528- Metallic Glasses and Amorphous Alloys
- Glass properties and applications
- Phase-change materials and chalcogenides
- High Entropy Alloys Studies
- High-Temperature Coating Behaviors
- Atmospheric chemistry and aerosols
- Composite Structure Analysis and Optimization
- Structural Analysis of Composite Materials
- Cellular and Composite Structures
- Electromagnetic wave absorption materials
- Nanoporous metals and alloys
- 3D Shape Modeling and Analysis
- Optical measurement and interference techniques
- Geological Studies and Exploration
- Recycling and utilization of industrial and municipal waste in materials production
- Magnetic Properties and Applications
- Welding Techniques and Residual Stresses
- Electrodeposition and Electroless Coatings
- Air Quality and Health Impacts
- Hydrocarbon exploration and reservoir analysis
- Air Quality Monitoring and Forecasting
- Microstructure and mechanical properties
- Material Dynamics and Properties
- Geochemistry and Geologic Mapping
Shanghai Dianji University
2024
Tohoku University
2006-2012
Institute for Materials Research, Tohoku University
2008-2011
We report an anomalous brittle-to-ductile transition (BTDT) in Au-based bulk metallic glasses (BMGs). Despite of brittle failure without noticeable plastic strain under uniaxial compression at room temperature, the BMGs exhibit remarkable plasticity cryogenic temperatures, which is opposite to BTDT crystalline materials. This originates from strong temperature dependence fundamental deformation units, viz. shear transformation zones, giving rise both superior and high strength for...
Bulk glassy alloy rods with a diameter of 16 mm and length 40 to 45 were produced for Zr65Al7.5Ni10Cu17.5 by tilt casting method. The specimens taken from the different sites which are away about 10 mm, 15 30 bottom surface cast rod consist phase their thermal stability, mechanical properties fracture mode almost independent specimen sites. glass transition temperature, temperature interval supercooled liquid region before crystallization heat 643 K, 102 K 55 J/g, respectively, three...
An efficient alloy design for bulk metallic glasses (BMGs) assisted by a composition–configurational entropy (C-CE) diagram has been proposed introducing feature of high-entropy (HE) alloys that are defined an equi-atomic with five or more elements. The compensated shortcoming in determining the compositions BMGs and led to success forming Pd20Pt20Cu20Ni20P20 HE-BMG maximum diameter 10 mm. C-CE demonstrates equi-atomicity alloys, providing candidates HE-BMGs. will promise opening up new...
Bulk glassy alloy rods with a diameter of 20 mm were produced for Zr61Ti2Nb2Al7.5Ni10Cu17.5 and Zr60Ti2Nb2Al7.5Ni10Cu18.5 by tilt casting method. The replacement Zr small amount Ti Nb caused distinct increase in the maximum from 16 Zr65Al7.5Ni10Cu17.5 to mm, accompanying decrease liquidus temperature reduced glass transition temperature. primary precipitation phase supercooled liquid also shows change, i.e., coexistent Zr2Cu, Zr2Ni Zr6NiAl2 phases 65%Zr an icosahedral 61%Zr 60%Zr alloys....
The Cu-Zr-Ag-Al glassy alloy samples of 15 mm in diameter were formed a wide composition range. best glass-forming ability (GFA) was recognized for Cu36Zr48Ag8Al8 alloy, and the critical achieved by copper mold casting 25 mm. high GFA attributed to deep eutectic composition, at which solidification occurs via homogeneous nucleation limited growth rate nuclei. Cu-Zr-based alloys exhibited excellent mechanical properties.
The elastic energy storing capability of bulk metallic glasses was evaluated by employing depth-sensing nanoindentation. densities four glassy alloys, determined nanoindentation measurements, are fairly close to their theoretical values estimated from modulus and strength. This study provides an accurate quick method measure the properties glasses.
Using ultrasonics, acoustic characteristics of a glassy alloy Cu45Zr45Al5Ag5 are examined in order to understand its low-temperature elasticity. Longitudinal and transverse wave velocities, eight kinds elastic parameters, dilational shear internal frictions were simultaneously measured as function temperature between 77 373 K alloy, using an ultrasonic pulse method. The inflection at around 328 for the anisotropy factor, four moduli, Poisson ratio, Debye temperature, 295 peak friction show...
The Ni57Nb19Zr19Ta5 glassy alloy possesses high corrosion resistance in severe environments, i.e. boiling 6 N HNO3 and + 5 g/l Cr6+ solutions. In both solutions, the of is much better than that NAR-310Nb stainless steel which developed as nitric acid resistant steel. XPS analysis reveals Ni-based alloys due to formation highly protective passive film composed exclusively Nb5+ Ta5+ cations after immersion solution without ions, Nb5+, Cr3+ with ions.