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Showing 1 to 17 of 17 for “"Bulk Metallic Glass"”.
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Constitutive Behavior of Bulk Metallic Glass Composites at Ambient and High Temperatures
When certain molten metallic alloys are rapidly quenched, they solidify to yield a disordered microstructure, called a metallic glass. Metallic glasses are generally brittle at room temperatures and fail catastrophically via one dominant or multiple shear bands. These limitations can be overcome by …
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Shear Modulus Relaxation of Bulk Metallic Glass, Palladium Nickel Phosphorus, Near the Glass Temperature
… to excite and detect a shear wave resonance in bulk amorphous metallic glass Pd40Ni40P 20 during and after a small sudden change in temperature. A shear modulus relaxation is observed with enough precision to determine how its time constant, tau, changes as the relaxation progresses. The results …
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Shear modulus relaxation of bulk metallic glass, Pd₄₀Ni₄₀P₂₀, near the glass temperature
… and non-linear behavior of relaxing glasses below the glass temperature, Tg, is a well known and poorly understood phenomena that is the subject of much experimental and theoretical effort. The Interstitialcy Theory, which describes glasses as perfect crystals with a few percent of …
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Thermoplastic forming of bulk metallic glass for surgical blade edges: A robust control approach
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Development of a hybrid process for manufacturing surgical-grade knife blade cutting edges from bulk metallic glass
… but material and processing costs are high. Bulk metallic glass (BMG) has the potential to be an economically-viable material of similar performance for use in precision surgical knives. To this end, a novel hybrid manufacturing process integrating thermally-assisted micromolding and …
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Development of temperature and feed rate controllers for a hybrid thermoplastic forming of surgical blades from bulk metallic glass
Bulk metallic glasses (BMG) are multi-component alloys that have an amorphous atomic structure. This new family of alloys exhibits a unique combination of high strength/hardness and high elastic limit, which is ideal for the formation and retention of a sharp edge. At a high temperature above glass …
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Development of a hybrid thermoplastic forming process for the manufacture of multi-facet and curvilinear surgical blades from bulk metallic glass
Bulk metallic glasses (BMGs) are multi-component alloys that have formed an amorphous atomic structure. This class of materials exhibit a unique combination of high strength/hardness and high elastic limit that is ideal for the formation and retention of a sharp edge. At high temperatures above the …
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Temporal properties of avalanche dynamics
… and foreshocks of slip avalanches in a bulk metallic glass, oscillations in the experimental setup affecting the ongoing avalanche dynamics, and temporal clustering of avalanches in systems with dynamic weakening.
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An investigation of fatigue in an Fe-based metallic glass by nanoindentation
An Iron-based bulk metallic glass was studied using nanoindentation to examine the effects of fatigue on the onset of plasticity. Experiments were performed on samples in an as received and 0.8Tg 12-hour annealed condition. The nanoindentation testing procedure focused on investigating fatigue of …
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From nanohardness to strength properties of cohesive-frictional materials : application to shale materials
… on a model cohesive-frictional material, bulk metallic glass, and a first application to a highly heterogeneous natural composite material, shale materials, is shown. The results are important in particular for the Oil and Gas industry, for which the reduced strength properties (cohesion …
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Structural Evolution In Mechanically Alloyed Fe-based Powder Systems
… 5, 10, 17, 20, 22, 25, 37.5 and 50 at. %) and a bulk metallic glass (BMG) composition (Fe60Co8Zr10Mo5W2B15) were subjected to mechanical alloying in a SPEX 8000 mixer mill. X-ray diffraction technique was employed to study the phase evolution, crystallite size, lattice strain and also to …
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High throughput prototyping and multiscale indentation characterization of metallic alloys
… structures. The composite material is a Ti-based bulk metallic glass matrix composites (BMG-MCs) in which dendrites of a crystalline phase exist in a matrix of amorphous phase. We have selected these alloys in this dissertation because of their importance to several advanced technologies, owing to …
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Order and Asymmetry in Jammed Systems
… process during heating and cooling protocols in metallic glasses. We measured the minimum cooling rate R<sub>c</sub>* to crystallize a liquid and the minimum heating rate R<sub>h</sub>* to crystallize a glass formed prepared using a fast quench at rate R<sub>p</sub>*. We find: (1) R<sub>h</sub>* …
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Nucleation of large avalanches
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Thermal and thermoelectric properties of nanostructured materials and interfaces
… of materials from thin films to nanostructured bulk systems, and (2) I discuss my measurements on several materials systems done with these characterization tools. First, I describe the development, assembly, and modification of a time-domain thermoreflectance (TDTR) system that we use to …
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A Methodology For Instrumented Indentation Studies Of Deformation In Bulk Metallic Glasses
Bulk Metallic Glasses (BMGs), also known as amorphous metals, are of considerable scientific and commercial interest due to their random or chaotic structure. Given their potential use as engineering materials, there is a concomitant need to establish their mechanical properties. However, BMGs are …
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Study of atomic scale dynamics of glass-forming metallic liquids using neutron scattering experiments and molecular dynamics simulations
Bulk metallic glasses are not the archetypal glass-former due to their large propensity for crystallization. They are characterized by complex multi-body interactions; yet have a simple structure that lacks internal degrees of freedom usually present in prototypical network or molecular …