Global ETD Search
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Showing 1 to 13 of 13 for “"Transformation mechanism"”.
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Domain structure, phase transformation, mechanical behavior and shape memory effect in a rare-earth orthoniobate lanthanum niobate
… undergo a tetragonal-to-monoclinic phase transformation. Both high- and low-temperature phases possess the scheelite structure, and the low temperature monoclinic phase is heavily domained. The transformation mechanism is unknown. The domain structure in the monoclinic phase was reported …
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First-principles investigation of Li intercalation kinetics in phospho-olivines
… and understanding the Li intercalation mechanism in phospho-olivines, namely LiFePO₄ and Li(Fe,Mn)PO₄, using first-principles calculations. Currently Li-ion battery technology is critically relied upon for the operation of electrified vehicles, but further improvements mainly in cathode …
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Understanding the origins of metastability in thin film growth; tantalum and the early group VB-VIB metals
… into Ta metastable phase formation, the Bain transformation mechanism is studied for Ta and the neighboring body centered cubic (bcc) transition metals in Groups 5 and 6 of the Periodic Table, resulting in the prediction of hypothetical body centered tetragonal (bct) and face centered cubic …
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Beyond Lithium-Ion Technology: Lithium-Sulfur and Potassium-Ion for Better and Cheaper Batteries
… next part of this PhD project, a new ion storing mechanism is designed to compete for the diffusion limitation and the structural deterioration of KIB electrodes. Unlike a rigid oxide electrode, the oxygen deficient loose-layered potassium titanates (LL-KTO) anode delaminates and restacks …
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Carbide-free bainitic steels for wear and rolling contact fatigue resistant applications
… toughness. In this work, knowledge about the transformation mechanism and its significance for mechanical properties are summarised. The role of carbon, which partitions after displacive growth of bainitic ferrite, is stressed as the main strengthcontributing factor. Alloy design together with …
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The role of defects during precipitate growth in a Ni-45wt% Cr alloy
… matching, but they do not accurately reflect the transformation mechanism during precipitation of bcc laths from an fcc parent.
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Particle shape anisotropy and its effects in AlNiCo and Fe-Cr-Co magnet alloys.
… coercivity) in a manner consistent with a common transformation mechanism. The evidence supports the view that this mechanism is spinodal decomposition, which initially produces an homogeneous, fine shape-anisotropic particle microstructure, and by subsequent diffusion during heat treatment …
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Solution History Effects and Crystal Phase Transformation in Polybutene-1 and Domain Morphology in Polyurethanes
… (--->) twinned hexagonal crystal phase transformation significantly alters the physical and mechanical properties of melt-crystallized PB-1. A study of the transformation mechanism at the molecular level was made. Results from an Avrami analysis imply that nucleation of the twinned …
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Theory and significance of retained austenite in steels
… following the bainite and martensite phase transformations have been examined, together with the influence of retained austenite on the properties of low alloy steels. It was found that the upper and lower bainite transformations are separate reactions, although both involve a displacive …
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Effect of heat treatment on the microstructure of a 2CrMoNiWV rotor steel
… on microstructural change, alloy carbide transformation mechanism and mechanical properties. Two complete continuous cooling transformation (CCT) diagrams were constructed for this steel on the basis of experimental dilatometry thermal analysis, metallographic examination and current phase …
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Transition Metal Heterogeneous Catalysis Towards Applications in Sustainable Energy: Leveraging Rational Design Principles for Activity, Stability, and Stereoselectivity
… of MHOF-specific motifs, which lead to phase transformations from MHOF to the Ni oxyhydroxide-like phase during OER, providing insight into the phase stability of these types of materials in base. During extended electrochemical OER cycling, linkers leach from the MHOF structure, exposing more …
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Evaluating the Potential of Scaling due to Calcium Compounds in Hydrometallurgical Processes
… pH and concentration of ions present. The transformation between CaSO4 hydrates is one of the common causes of scale formation. A systematic study was carried out to investigate the effect of various parameters including temperature, acidity, seeding, and presence of sulphate/chloride salts …
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Redefining the Gastrula Organiser in Early Chick Embryo Development
… Future work will focus on identifying this mechanism. Despite the last 100 years of research, there are still fundamental questions regarding the node’s requirement for neural induction, versus its sufficiency in a graft experiment. The timing of the requirement of signals from the node is …