Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 40 for “"metallic glass"”.
-
Kinetic metallic glass evolution model
The structure of metallic glass controls its mechanical properties; this structure can be altered by thermomechanical processing. This manuscript presents a model for this structural evolution of metallic glass under thermal and mechanical stimuli. The foundation of this model is a potential energy …
-
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 …
-
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 …
-
Laser welding of metallic glass to crystalline metal in laser-foil-printing additive manufacturing
"The application of metallic glasses has been traditionally limited to parts with small dimensions and simple geometries, due to the requirement of fast cooling during the conventional process of casting. In addition, joining metallic glass to crystalline metal is of interest for many applications …
-
Shear Modulus Relaxation of Bulk Metallic Glass, Palladium Nickel Phosphorus, Near the Glass Temperature
… 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 discriminate …
-
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 …
-
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
-
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 micro-drawing …
-
Rapid Solidification and Undercooling of Aluminum-Germanium Alloys: Characterization and Control of Microstructure (Metastability, Metallic Glass, Electron Microscopy)
A determination of the importances of undercooling and cooling rate in the microstructural development of Al-Ge alloys during rapid solidification has been carried out. A new technique has been developed which allows for such determinations to be performed directly in a transmission electron …
-
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 …
-
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 …
-
Deformation Localization in Constrained Layers of Metallic Glasses: A Parametric Modeling Analysis
… known as shear banding is a prominent feature in metallic glasses. In this study we perform parametric three-dimensional finite ele- ment analyses, using primarily a thin layer of metallic glass on top of a cylindrical base, to study how physical constraint can affect this localized form of …
-
Synthesis and Characterization of Titanium Zirconium Based Alloys for Capacitor Use
… It also examines creep of Ti25Zr38Be37 metallic glass for surface enhancement. A variety of mechanical and electrical properties were measured. Leakage current through the anodic dielectric was found to decrease with increasing zirconium content. Alloy treatments which produce …
-
Aspects of the mechanics of metallic glasses
Metallic glasses are amorphous materials that possess unique mechanical properties, such as high tensile strengths and good fracture toughnesses. Also, since they are amorphous, metallic glasses exhibit a glass transition, and at temperatures above this glass transition, they soften dramatically …
-
A continuum constitutive model for amorphous metallic materials
… the deformation response of amorphous nietallic glasses. Specifically, the response of an amorphous metallic glass in tension, compression, strip-bending, and indentation is studied, and it is shown that results from the numerical simulations qualitatively capture major features of corresponding …
-
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.
-
Studies of Structural and Chemical Ordering in Metallic Liquids and Glasses Using Electrostatic Levitation
<p>Since the discovery of the first metallic glass in 1960, there has been a large research effort dedicated to understanding the glass transition and the formation of metallic glass from the supercooled liquid state. Knowledge of the relationship between the liquid's structure and its …
-
Real-time atomic resolution dynamics of glass surfaces
Although glasses are commonplace materials found in every walk of life, they have managed to remain mysterious for centuries. The origins of the defining characteristic of glasses, the glass transition, remain unknown. The glass transition is accompanied by a catastrophic increase in viscosity with …
Page 1 of 2