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 37 for “"high-entropy alloys"”.
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Hydrogen-Induced Transformations in Metastable High Entropy Alloys
… critical challenge to application of structural alloys in hydrogen (H) environments. Recently, development of high-entropy alloys (HEAs) has opened a new avenue for alloy design against HE: not only do some HEAs indicate resistance to HE, but the immense composition spaces associated with these …
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Development of High Entropy Alloys for High Temperature Applications
High Entropy Alloys, Spark Plasma Sintering, Ball milling, AlCoCrFeNI HEA, CO- Free HEA, Oxidation, Corrosion
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Investigating Dislocation Behavior in High Entropy Alloys Using Atomistic Simulations
High-entropy alloy (HEA) is a new alloying strategies involving multi-principal elements in near equiatomic proportions.[39, 11, 37, 19, 41, 13] To fully understand and tune the mechanical properties and crystal plasticity of the alloys, it is necessary to investigate the dislocation behavior[15]. …
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First Principles Method for Complex Cement Structure and High Entropy Alloys
… – secondary of Portland cement structure and high entropy alloys (HEAs). Similar concept of the computational method was applied to obtain properties of the two materials. Two based DFT packages are used, VASP and OLCAO. Both materials possess a complex structure. Ettringite and thaumasite are …
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Development of new high entropy alloys for brazing of Ni-base superalloys
High entropy alloys (HEAs), also called multi-principal component alloys, are novel alloys containing at least five elements with an atomic percent ranging between 5% and 35%. HEAs have attracted attention due to their unique properties such as high strength, good ductility, and high resistance to …
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Development and characterization of nanostructured steels and high entropy alloys for nuclear applications
… are subjected to a harsh environment including high temperatures and radiation fluences. In order to extend the lifetime of current light water reactors (LWRs) and realize the development of advanced Gen IV nuclear reactors new materials must be developed which can withstand such an environment. …
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Underlying deformation behavior of medium/high entropy alloys using advanced electron imaging and diffraction
Medium and high entropy alloys (M/HEAs), formed in a large region of compositional space that are little explored, have demonstrated unusual combinations of strength, ductility, and damage tolerance. Their complex chemistries create rich defect energy landscapes and multiple pathways for mechanical …
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Materials Design for Advanced Nuclear Energy Systems: Refractory High Entropy Alloys and Metallic Multilayer Composites
… a multitude of materials challenges due to high op- erating temperatures, corrosive environments, and neutron radiation damage. In this thesis, I focus on two approaches to designing better materials for advanced reactors, high entropy alloys (HEAs) and metallic multilayer composites …
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Synthesis, characterisation, and properties of powder metallurgy transition metal-based high entropy alloys for electrocatalytic application
… materials for OER applications due to their high natural abundance and low cost. However, these materials exhibit poor conductivity and consequently poor catalytic activity. Hence to overcome the shortcomings of conventional electrocatalysts a new class of multi component alloys termed as …
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Dynamic weakening and trained memory in avalanche dynamics from high-entropy alloys to neurons and spin systems
… scales, and quasi-periodicity. Such deviations highlight the role of additional mechanisms, particularly dynamic weakening and healing, which temporarily modify local thresholds during and after avalanches. This thesis investigates how weakening and healing govern avalanche dynamics in materials …
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Phase stability and the Portevin-Le Chatelier effect in Cr-Mn-Fe-Co-Ni High-Entropy Alloys
High-Entropy Alloys (HEAs) are a new class of metallic materials based on the combination of multiple principal elements, often with the intention to form a concentrated solid solution. It has been suggested that these solid solution phases could offer enhanced mechanical properties, due to …
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Developing machine learning interatomic potentials to probe the plasma-materials interactions of tungsten-based high-entropy alloys as plasma-facing components
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
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Estudo da difusão de hidrogênio em uma liga de alta entropia (CoCrFeNiMn) equimolar e nanocristalina
Without a base element, High Entropy Alloys (HEA) have many crystallines structures and microstructures. HEA can have high wear resistance, high hardness, compressive strength at high temperatures and good resistance to corrosion. High Entropy Alloys can have a single phase or more phases. The …
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Atomistic Modeling of Defect Energetics and Kinetics at Interfaces and Surfaces in Metals and Alloys
… free surfaces and grain boundaries in metals and alloys play important roles affecting many material properties such as fracture toughness, corrosion resistance, wetting, and catalysis. Their interactions with point defects and solute elements also play critical roles on governing the …
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Effect of heat treatment on the mechanical and corrosion properties of the CoCrNiFeAl HEAs
High entropy alloys (HEAs) are a relatively new class of metallic materials that have shown great potential for use in extreme environments, such as high temperatures and corrosive conditions. Among the different types of HEAs, CoCrNiFeAl HEAs are potential materials for a wide range of …
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The effects of irradiation on the creep and hardening behavior of crystalline and amorphous materials
… materials under harsh environments such as high irradiation dose and temperature is one of the major constraints in the development of novel materials for nuclear applications. This thesis explores the effects of irradiation on the mechanical properties of several model alloys in the context …
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Computation Aided Design Of Multicomponent Refractory Alloys With A Focus On Mechanical Properties
… focuses on calculating elastic properties of high entropy alloys, a new class of alloys that are built from 4+ elements in equi-atomic proportion. These alloys often exhibit simple microstructures and each constituent element contributes its properties to the overall bulk properties of the …
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Advancing Catalysis Theory with Theory-infused Deep Learning
… surfaces. In this dissertation, We will highlight the role of TinNet in the rapid development of new catalytic materials, emphasizing its crucial contribution to sustainable chemical processes. The framework is particularly flexible at predicting surface reactivity, electronic structures, …
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Fabrication and characterization of advanced materials using laser metal deposition from elemental powder mixture
… spent to machine large and complex parts from high-performance metals (i.e., titanium components for aerospace applications), so users attempt to circumvent the high cost of materials. Laser metal deposition (LMD) is an additive manufacturing technique capable of fabricating complicated …
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Voxelized Atomic Structure Framework for Atomistic Modeling of Multifunctional Materials
… (VASt) framework for formulating physics-based, high-fidelity reduced-order material structure-property relationships using density functional theory (DFT) computations. We first use DFT with the Boltzmann transport equation to compute the thermal conductivity of the novel electride Ca2N and to …
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