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 20 of 325 for “"alloying"”.
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Stress evolution of lithium alloying electrodes during cycling
… studies of lithium-silicon and lithium-germanium alloying, including the kinetics of phase formation and dissolution (e.g. of Li₁₅Si₄ and Li₁₅Ge₄).
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Consolidation of WC-Co nanocomposites synthesised by mechanical alloying
The influence of mechanical alloying (MA) milling time, temperature, sintering method and microstructure on the mechanical properties of a tungsten carbide-cobalt (WC-Co) hardmetal, based on 10wt% Co, has been established. The effects of high-energy milling for 30, 60, 180 and 300 min and the …
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A novel mechanism for metal alloying at the nanoscale
… We propose a novel mechanism for metal alloying at the nanoscale, which provides a general route for alloying dissimilar elements into single-phase solid-solution nanoparticles, referred to as high-entropy-alloy nanoparticles (HEA-NPs). To validate the theory, we developed a facile …
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First-Principles Investigation of Doping and Alloying of β-Ga2O3
… of <em>β</em>-Ga<sub>2</sub>O<sub>3</sub> by alloying with the lightest Group-13 cation, B.</p> <p>We find that doping with Bi creates mid-gap states derived from the Bi 6<em>s</em> electrons at similar energy level to candidate acceptors through an anti-bonding hybridization of the Bi lone …
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In Situ Alloying of Titanium via Laser Powder Bed Fusion
… addresses these challenges through in-situ alloying strategies that use mixed elemental or composite feedstocks to enable novel Ti-based alloy development directly during LPBF processing. The first stage of this work investigates a binary Ti–2.9Cu alloy fabricated from blended Ti and Cu …
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Polymer blends formed by the solid state mechanical alloying process
… This novel technique, called Mechanical Alloying (MA), involves the repeated welding, working hardening, and fracture of metallic powders to form an alloy. The research presented in this thesis describes the use of the MA process to form polymer blends. Until recently there has been no …
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Alloying effects on high-temperature deformation behavior of nickel aluminide intermetallics
The objective of this research is to examine the possibility of using nickel aluminide for high temperature structural applications. NiAl is a desirable candidate based on its low density, high thermal conductivity, high melting temperature, and its proven oxidation resistance. Currently, limited …
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Additive Manufacturing of Aluminium-Metal Matrix Composite developed through Mechanical Alloying
… investigates the suitability of the mechanical alloying as a novel method of producing feedstock material for the LM process. This research further explores the interaction of the composite powders with the laser until suitable process parameters were obtained. Furthermore, the fractography, …
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The Influence of Alloying Additions on Diffusion and Strengthening of Magnesium
… where reduced weight is a primary motivator. Alloying can enhance the properties of magnesium without significantly affecting its density. Essential to alloy development, inclusive of processing parameters, is knowledge of thermodynamic, kinetic, and mechanical behavior of the alloy and its …
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Defects and alloying in semiconductors: computational studies of clusters and surfaces
This thesis addresses two main systems that are important in the lore of energy efficient nanomaterials, titanium dioxide and group IV alloy nanoclusters. Titanium dioxide, widely used in heterogeneous catalysis, photocatalysis, solar cells, or gas sensors, has become the prototype material for …
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Modeling of Effect of Alloying Elements on Radiation Damage in Metallic Alloys
… dynamics simulations were conducted to study the alloying element effects on the primary damage in Fe-based alloys, including defect production and dislocation loop transformations, and their connections with defect thermodynamics. First, effects of alloying elements on the primary damage in three …
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Dispersion and Integration of Dopants by Mechanical Alloying in Complex Hydrogen Storage Materials
Prior work had found that MgH2, a thermodynamically hindered system, can be destabilized through the introduction of Si but no microstructural information has been presented. In this work, confirmation of the proposed forward dehydriding mechanism to Mg2Si was obtained in the MgH 2 + Si system …
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Lithiation-induced phase transitions in alloying anodes for thin film lithium-ion batteries
… germanium (a-Ge), which store lithium through alloying processes rather than through intercalation, are among the top candidates as anodes for thin film Li-ion batteries. This thesis explores different types of lithiation-induced phase transitions and develops corresponding kinetic models in …
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Effects of alloying elements upon austenite decomposition in high strength low alloy steels
… was explained by synergistic interactions among alloying elements. The paraequilibrium model was applied to calculate the metastable fraction of ferrite in each alloy. This fraction was shown to coincide with cessation of transformation in the Mo alloy transformed at 600°C. Transformation stasis …
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Microstructural Engineering of Titanium-Cellulose Nanocrystals Alloys via Mechanical Alloying and Powder Processing
Titanium been used industrially for nearly a century. Ever since it was first reduced to its elemental form, concerted efforts have been made to improve the material and to reduce the cost of production. In this thesis, titanium is mechanically alloyed with cellulose nanocrystals followed by powder …
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Structural Characterization and Thermoelectric Performance of ZrNiSn Half-Heusler Compound Synthesized by Mechanical Alloying
… atomic structure were synthesized by mechanical alloying (MA) and consolidation by either Spark Plasma Sintering (SPS) or hot pressing (HP). X-Ray diffraction patterns of as milled powders and consolidated samples were compared and analyzed for phase purity. Thermal conductivity, electrical …
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