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.
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Showing 1 to 12 of 12 for “"alloy microstructure"”.
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Theory of carrier transport in III-Nitride based heterostructures
Wurtzite III-nitride materials and their alloys have attracted significant interest for solid state lighting applications. This is due to the direct band gaps of InN, GaN, and AlN crystals, which span a wide range of emission wavelengths. Due to the importance of these systems, the goal of …
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Laser Surface Alloying Low Carbon Steel Using Chromium and Nickel Powder Feed: Mechanisms, Microstructures, Properties and Models (Corrosion, Conduction, Mass Transfer)
The process of laser surface alloying was studied. The principal objectives were to use elemental powders or their mechanical mixtures to make surface alloys, evaluate alloy microstructure and properties, and develop mathematical models to interpret the observed results. A new powder feeding system …
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E-SEM Characterization of Escherichia coli Biofilms Grown on Copper- and Silver-Alloyed Stainless Steels over a 48 -
… antimicrobial material. Stainless steels alloyed with small amounts of either copper (Cu) or silver (Ag), both well-known natural antimicrobial agents, have been investigated since their initial development in the late 1990's onward. This class of materials have been proven to show …
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Metallographic study of gamma - gamma prime structure in the Ni-based superalloy GTD111
… and scientific interest. Ni-based superalloy GTD111 is used at a number of GE-manufactured power generation turbines. The outstanding creep resistance features of Ni-based superalloys can be attributed to a large extent, to the gamma prime ([gamma]') precipitates found within the FCC …
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Hard and tough electrodeposited aluminum-manganese alloys with tailored nanostructures
… overarching goal of this thesis. Binary Al-Mn alloys are electrodeposited using a conventional current waveform in a chloroaluminate electrolyte at ambient temperature. It is found that alloys with low Mn contents comprise micrometer-sized FCC grains. At intermediate Mn contents, the FCC grain …
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Microstructure Evolution of Two Model Ferritic/Martensitic Steels Under Ion Irradiation In A Transmission Electron Microscope
… development and optimization of such advanced alloys for in-reactor use, a fundamental understanding of radiation damage accumulation in materials is required. Especially, in order to predict the in-reactor performance of ferritic/martensitic alloys, it is essential to understand the basic …
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Modeling Dissolution in Aluminum Alloys
Aluminum and its alloys are used in many aspects of modern life, from soda cans and household foil to the automobiles and aircraft in which we travel. Aluminum alloy systems are characterized by good workability that enables these alloys to be economically rolled, extruded, or forged into useful …
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The study of aluminium anodes for high power density AL-air batteries with brine electrolytes
In this thesis aluminium alloys containing small additions of both tin (~ 0.1 wt %) and gallium (~ 0.05 wt %) dissolve anodically at high rates in brine media; at room temperature, current densities > 0.2 A cm-2 can be obtained at potentials close to the open circuit potential, ~ -1.5 V vs SCE. …
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Machine learning approach to model the microstructure and strength of nickel superalloys
Nickel superalloys are a class of materials that find crucial applications in technologies such as jet and gas turbine engines. In order to accelerate the further development of these alloys, this thesis develops machine learning models that can better predict their microstructure and strength. The …
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Understanding the post-processing behaviour of additively manufactured A20X alloy: The new high-strength Al alloy in the market
L'abstract è presente nell'allegato / the abstract is in the attachment
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Strain Localization in Tungsten Heavy Alloys and Glassy Polymers
… strain rate deformations of metals and metallic alloys, narrow regions of intense plastic deformations have been observed experimentally. The phenomenon is termed strain localization and is usually a precursor to catastrophic failure of a structure. Similar phenomenon has been observed in glassy …
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Design, microstructure and properties of metastable beta-type biomedical titanium alloys
… implant biomaterials including cobalt-chromium alloy, stainless steel, Ti-6Al-4V and commercially pure titanium have all been shown to demonstrate mechanical incompatibility, poor osseointegration and/or cause cytotoxic effects on the human body after some years of application, leading to …