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 13 of 13 for “"structural metals"”.
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Application of Thermomechanical Characterization Techniques to Bismuth Telluride Based Thermoelectric Materials
… were greater than ten times the tan delta of structural metals, and reflected the anisotropic nature of TE materials. DMA thermal scans showed changes in mechanical properties versus temperature with clear hysteresis effects. These results showed that the application of DMA techniques are …
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Chemical and structural analysis of grain boundaries in Inconel 690 for corrosion resistance
… years. The study of alloy 690, as well as other structural metals, is important in order to understand, predict, and avert costly and dangerous failures that could occur due to SCC later in the life of the plants. The microstructure of an alloy has an important effect on its corrosion and SCC …
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Effects of chromium and silicon on corrosion of iron alloys in lead-bismuth eutectic
… enhanced safety features. However, corrosion of structural metals represents a major limiting factor in developing advanced liquid Pb-alloy coolant technology. In fact, the development of advanced structural and cladding alloys that are resistant to corrosion over a wide range of oxygen …
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Multiscale In-Situ Characterization of Crystal Orientation, Temperature, and Microstructure Effects on Creep Defromation of Pure Magnesium and Mg-Al-RE Alloys
Magnesium (Mg) and its alloys are the lightest structural metals, valued for their high strength-to-weight ratios in automotive and aerospace applications. Their broader use is restricted by limited creep resistance and pronounced anisotropy of plastic deformation, especially at elevated …
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Beyond Embrittlement: In-Situ Explorations of Hydrogen Effects Near the Boundaries
… embrittlement (HE) still limits the use of structural metals in hydrogen environments today. As the demand for hydrogen clean energy equipment increases, it is ever so pressing for us to extend our understandings of embrittlement mechanisms. The discourse in the current proposed HE …
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High throughput prototyping and multiscale indentation characterization of metallic alloys
… at different length scales in polycrystalline metals in the form of indentation stress-strain curves. These responses can then be correlated to local material structure using modern data-driven approaches. In this work, we are seeking two main goals. First, exploring the viability of high …
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Design and Development of Damage-Tolerant Active Materials
… and battery electrodes, and can be prone to structural instabilities and abrupt failure. This thesis aims to enhance the damage tolerance of active materials by designing multi-phase composites incorporating secondary phases that can “proactively” divert damage into more benign forms. The …
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Fabrication And Damping Behavior Of Particulate BaTiO3 Ceramic Reinforced Copper Matrix Composites
… of enhancing damping characteristics of structural metals, copper was reinforced with tetragonal ferroelectric BaTiO3 particulates (Cu-BaTiO3 composites) using powder metallurgy techniques. The effect of particulate size and three processing conditions, sintering atmosphere, cooling rate …
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Mechanics of 3D Composites
… of a ceramic target such as dwell and structural size effect. Dwell is captured using the constitutive model and the related physics is studied along with identification of causes of dwell. Origins of structural size effect in ceramics are identified and their influences are studied. In …
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Hydrogen effects on the evolution of plastic deformation in polycrystalline nickel: A mechanism for intergranular failure
… a significant and pervasive phenomenon in many structural metals applications, but the underlying physical mechanism is not yet fully understood. The mechanism for hydrogen-induced intergranular failure of polycrystalline nickel was investigated in a series of uniaxial slow strain rate tensile …
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Effect of roughness, microstructure, and chemistry on the environmental durability of structural alloys
… where one design property is usually optimized, structural materials need to meet several design requirements including but not limited to excellent mechanical properties and environmental tolerance. However, more often than not, the metallurgical principles used to improve mechanical properties …
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Steady crack growth through ductile metals: Computational studies
… response during sustained ductile tearing in structural metals at quasi-static rates using high resolution finite element computations. At load levels approaching the steady-growth regime, well-established computational methods that model material damage break down numerically as vanishingly …
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Anode Materials for High Power Microwave Devices
… manufacturing technique for treatment of metals for vacuum applications. Commercial applications include but are not limited to: laser surface melting of steel chambers for ultra/extreme high vacuum systems (particle accelerators, etc.), analytical techniques (XPS, SIMS, SEM, FIB, etc.). …