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A synthesis method for the production of porous bulk metallic glass (BMG) was introduced. This method utilizes the superplastic forming ability of amorphous powder in the supercooled liquid (SCL) state and intenerating salt mixture as a placeholder to produce BMG foam by using a hot die pressing method. Scanning electron microscope (SEM), X-ray diffraction (XRD) and differential scanning calorimetry...
The effects of Ta addition on the microstructure and mechanical properties of Ti 40 Zr 25 Ni 8 Cu 9 Be 18 bulk amorphous alloy were investigated by using X-ray diffraction (XRD), transmission electron microscopy (TEM), scan electron microscopy (SEM) and compressive testing. As a result, the addition of Ta (0-8at%) prompted the successive precipitation of quasicrystalline...
The formation and thermal stabilities of Cu 46.25 Zr 46.25-x Al 7.5 Er x , (x=0 to 8) bulk metallic glasses (BMGs) were investigated. The addition of a small amount of Er (2at%) for replacing Zr effectively improves the glass-forming ability of Cu 46.25 Zr 46.25 Al 7.5 alloy, and the glassy rod with a diameter of at least 12 mm can be formed...
The heating processes of amorphous Ni x Zr 100-x (x=10, 16.7, 33.3) alloys were investigated with molecular dynamics simulations. The simulation results show that the crystallization of amorphous alloys during heating is controlled by the heating rate and the alloy's composition. The slower heating rate depresses the crystallizing temperatures and the melting temperatures of the amorphous...
Mg 65 Cu 20 Zn 5 Y 9 Zr 1 bulk metallic glass matrix composite with a diameter of 2 mm was produced by copper mold casting. Upon cooling the Mg 65 Cu 20 Zn 5 Y 9 Zr 1 melt, Mg 2 Cu acicular crystalline phase precipitates uniformly with a size of about 20 μm long and 1 μm thick while the remaining melt undergoes...
La 57.6 Al 17.5 (Cu, Ni) 24.9 and La 64 Al 14 (Cu, Ni) 22 bulk metallic glasses (BMGs) were prepared by copper-mould casting method. Plastic deformation behavior of the two BMGs at various loading rates was studied by nanoindentation. The results showed that the La 57.6 Al 17.5 (Cu, Ni) 24.9 BMG with a glass transition temperature...
The cluster-based composition rule in ternary alloy systems including quasicrystals, bulk metallic glasses, crystalline phases and Lave phases-related body-centered cubic (BCC) solid solution forming systems was summarized. The so-called cluster line in a ternary phase diagram refers to a straight composition line linking a specific binary cluster to the third element. The composition ranges of quasicrystals...
The formation of bulk metallic glasses (BMGs) in ternary Cu-Zr-Ti system was investigated by a copper mold casting method. The nature of the amorphous phase was verified by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). It was demonstrated that the BMGs could be formed in a broad composition range in this system. Cu 50 Zr 42.5 Ti 7.5 , Cu 60 Zr...
The glass forming ability of the [(Fe 12/13 Y 1/13 ) 100-x B x ] 96 Nb 2 Zr 2 (x=9–26) system was investigated using a series of cluster lines. Three types of clusters, an icosahedron (Fe 12 Y), a capped Archimedes anti-prism (Fe 8 B 3 ) and a capped trigonal prism (Fe 9 B), as well as a binary eutectic (Fe ...
The bulk metallic glass formation in the Cu-Zr-M ternary systems by alloying of a binary basic Cu 6 Zr 5 cluster was investigated, where M stands for Sn, Mo, Ta, Nb, Ag, Al and Ti. The Cu 6 Zr 5 cluster is a capped Archimedean antiprism that characterizes the local structure of the Cu 10 Zr 7 crystalline phase. This cluster composition almost superposes...
The glass-forming ability of binary Ge x Te 100-x (x=15, 20, 30) alloys was investigated. The crystallization mechanism of these amorphous bulks was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calo-rimetry (DSC). The temperature of glass transition, the temperature of crystallization, the activation energy for glass transition and...
The thermal stability and glass-forming ability of Y 56-x Ce x Co 20 Al 24 (x=15, 20, 25, 28, 38, 41, 44) bulk metallic glasses with a diameter of 5 mm were investigated by differential scanning calorimetry and X-ray diffraction. The results show that the thermal stability of the alloys decreases with the addition of Ce. It has the best glass-forming ability when x=25,...
Ternary Sm-based Sm-AI-Co alloys at specific compositions designed using an e/a- and cluster-related criteria exhibit high glass forming abilities and form bulk glassy rods of 3 mm in diameter by a copper mold suction-casting method. Four compositions of bulk metallic glasses (BMGs) are Sm 50 Al 25 Co 25 , Sm 52 Al 24 Co 24 , Sm 54 Al 23...
An analytical phase transformation model has been used to study the kinetics of crystallization of amorphous alloys subjected to either isothermal or isochronal anneals. The model has been applied to Mg 82.3 Cu 17.7 and Pd 40 Cu 30 P 20 Ni 10 , employing isothermal and isochronal differential scanning calorimetry. Applying different combinations of nucleation...
Pd 81 Si 19 amorphous alloys were prepared by combination methods of melt spinning and B 2 O 3 flux treatment. A comparison between the ribbons prepared from the fluxed ingots and the non-fluxed ones has been carried out. The result reveals that after fluxing treatment the glass transition temperature of the as-prepared glassy ribbons is reduced while the initial crystallization...
Fe 40 Ni 40 P 14 B 6 bulk metallic glass rods have been prepared by water quenching the fluxed alloy. The deformation behavior was investigated by nanoindentation tests and compressing tests. The average hardness and elastic modulus of the as-prepared Fe 40 Ni 40 P 14 B 6 BMG (bulk metallic glass) measured by nanoindentation tests are...
Fe-based amorphous alloys with ductility were synthesized using the commercial cast iron QT50 (denoted as QT) with the combining minor addition of B and Al by single roller melt-spinning. The melt-spun (QT 1-x B x ) 99 Al 1 (x is from 0.006wt% to 0.01wt%) amorphous alloys exhibit onset crystallization temperatures and Curie temperatures of 759–780 and 629–642 K respectively,...
The glass forming ability (GFA), microstructure and magnetic property in (Nd 60 Al 10 Ni 10 )Cu 20-x Fe x (0 ≤ x ≤ 20) alloys were investigated by using X-ray diffraction (XRD), differential scanning calorimetry (DSC), high resolution transmission electron microscopy (HRTEM) and magnetic property measurement. It is shown that the GFA of the alloys decreases...
Silica fibers-reinforced, fused silica composites were fabricated with repeated vacuum-assisted liquid-phase infiltration. The mechanical properties, thermal properties, and ablative properties of the samples were evaluated. The effect of the silica fiber content and treatment temperature on the flexural strength of the three-dimensional SiO 2 (3-D SiO 2 ) composites also was investigated...
Combining the GIS (geographic information systems) grid-based data with four proposed column-based 3D slope stability analysis models, a comprehensive solution of a high-steep open-pit slope has been obtained. For six searching ranges, 19 critical slip surfaces of different sizes have been studied, in which the minimum 3D safety factor is 1.33. Comparison of 3D safety factors of designed and proposed...
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