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Rozprawy doktorskie na temat „Atom probe tomograpghy”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 20 lutego 2023

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1

Marceau, Ross Kevin William. "Design in Light Alloys by Understanding the Solute Clustering Processes During the Early Stages of Age Hardening in Al-Cu-Mg Alloys." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/4008.

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The evolution of atomistic-level nanostructure during the early stages of both standard, high-temperature T6 heat treatment, and low-temperature secondary ageing after interruption of the former (T6I4), has been investigated in rapid hardening Al-Cu-Mg alloys using a variety of microscopy and microanalytical techniques, including transmission electron microscopy (TEM), positron annihilation spectroscopy (PAS) and atom probe tomography (APT). In order to carry out this objective, quantitative data-analysis methods were developed with respect to new cluster-finding algorithms, specifically desig

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Marceau, Ross Kevin William. "Design in Light Alloys by Understanding the Solute Clustering Processes During the Early Stages of Age Hardening in Al-Cu-Mg Alloys." University of Sydney, 2008. http://hdl.handle.net/2123/4008.

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Doctor of Philosophy (PhD)<br>The evolution of atomistic-level nanostructure during the early stages of both standard, high-temperature T6 heat treatment, and low-temperature secondary ageing after interruption of the former (T6I4), has been investigated in rapid hardening Al-Cu-Mg alloys using a variety of microscopy and microanalytical techniques, including transmission electron microscopy (TEM), positron annihilation spectroscopy (PAS) and atom probe tomography (APT). In order to carry out this objective, quantitative data-analysis methods were developed with respect to new cluster-finding

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Withrow, Travis P. "Computational Modeling of Atom Probe Tomography." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1525763934302517.

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Engberg, David. "Atom Probe Tomography of TiSiN Thin Films." Licentiate thesis, Linköpings universitet, Tunnfilmsfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122724.

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This thesis concerns the wear resistant coating TiSiN and the development of the analysis technique atom probe tomography (APT) applied to this materials system. The technique delivers compositional information through time-of-flight mass spectrometry, with sub-nanometer precision in 3D for a small volume of the sample. It is thus a powerful technique for imaging the local distribution of elements in micro and nanostructures. To gain the full benefits of the technique for the materials system in question, I have developed a method that combines APT with isotopic substitution, here demonstrated

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Yang, Qifeng. "Atom probe tomography research on catalytic alloys and nanoparticles." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:f3acdf37-3d23-4893-a4de-12e81712157a.

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Catalyst is a key component in the chemical industry, with more than 90% of total chemical products reliant on their use. However, the working mechanisms are in many cases still not fully understood. For heterogeneous catalysts, in which the reactions normally occur on solid phase materials, a better understanding of the catalytic surfaces, and how they evolve under reactive environments is recognised as the next step forward in the field. This work presents a study utilising atom probe tomography (APT), combined with an in-situ reaction cell, to understand the initial oxidation processes of c

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McCarroll, Ingrid. "Corrosion Processes: Through the lens of atom probe tomography." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/18131.

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1 Abstract The motivation behind the current work is twofold. In the first instance it stems from a desire to understand and advance knowledge and instrumentation in the field of atom probe tomography (APT). In the second instance it is driven by the need for rapid advancements in engineered materials to keep up with the energy requirements of a continuously developing and demanding technological world. Advances in the capabilities of APT have only recently made analysis of semi- and non- conductive materials possible, opening up the APT field to the corrosion science community. The curre

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Araullo-Peters, Vicente James. "Advancements in atomic-scale analytical methods and their application to understanding materials." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12770.

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Atom probe tomography is a high resolution microscopy technique capable of determining the 3D location and chemical identification of individual atoms within a specimen. Though it is becoming ever more popular, a number of issues with the technique are known. First, the large amount of data created by atom probe tomography experiments requires new techniques to be developed so as to conduct effective analysis. Also, atom probe tomography is not traditionally considered a tool for crystallographic analysis even though crystallographic information is known to be present in reconstructed datasets

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Bennett, Samantha. "Nitride semiconductors studied by atom probe tomography and correlative techniques." Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/236685.

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Optoelectronic devices fabricated from nitride semiconductors include blue and green light emitting diodes (LEDs) and laser diodes (LDs). To design efficient devices, the structure and composition of the constituent materials must be well-characterised. Traditional microscopy techniques used to examine nitride semiconductors include transmission electron microscopy (TEM), and atomic force microscopy (AFM). This thesis describes the study of nitride semiconductor materials using these traditional methods, as well as atom probe tomography (APT), a technique more usually applied to metals that pr

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Chen, Yi-Sheng. "Characterisation of hydrogen trapping in steel by atom probe tomography." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:9d8ee66f-176d-4ac1-aad6-ccb33efc924d.

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Hydrogen embrittlement (HE), which results in an unpredictable failure of metals, has been a major limitation in the design of critical components for a wide range of engineering applications, given the near-ubiquitous presence of hydrogen in their service environments. However, the exact mechanisms that underpin HE failure remain poorly understood. It is known that hydrogen, when free to diffuse in these materials, can tend to concentrate at a crack tip front. In turn, this facilitates crack propagation. Hence one of the proposed strategies for mitigating HE is to limit the content of freely

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10

Oberdorfer, Christian [Verfasser], and Guido [Akademischer Betreuer] Schmitz. "Numeric simulation of atom probe tomography / Christian Oberdorfer ; Betreuer: Guido Schmitz." Münster : Universitäts- und Landesbibliothek Münster, 2014. http://d-nb.info/1138282715/34.

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Montalvo, Delgado Stephanie Dannett. "Development and application of atom probe tomography to complex zircon grains." Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/81227.

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Atom probe tomography (APT) is used to characterise the nanoscale geochemistry of complex zircon grains from different environments. New applications of APT to meteoritic, shocked and hydrothermal zircon grains are developed. The results of this project provide a new understanding of trace element modification of zircon and provides a framework for future investigations of the nanoscale geochemical and geochronological analysis of other minerals.

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12

Innocenti, Nicolas. "Interaction of femtosecond laser pulses with nanoscaleSi-tips for atom probe tomography." Thesis, University of Liège, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-51018.

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The atom probe is an analysis technique based on the emission of ionized species from a needle-shaped sample (apex radius < 100 nm) under the influence of a very strong electric field ( 10-50 V/nm). A DC-voltage is applied on the sample in order to generate a field slightly below the one necessary to remove atoms (in the form of ions) from its surface. An ultrashort (femtosecond) laser pulse is used to trigger the emission. The evaporated ions are accelerated in the electric field and projected onto a position sensitive detector where a magnified image of the surface is formed (magnication

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13

Zhang, Yi. "Three dimensional atom probe tomography of nanoscale thin films, interfaces and particles." [Ames, Iowa : Iowa State University], 2009.

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Samudrala, Saritha Kowmudy. "Atomic scale analysis of nanocrystalline materials by advanced microscopy." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/13655.

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In this thesis, relatively new and advanced microscopy techniques are used to overcome many challenging problems in characterisation of nanocrystalline (nc-) materials. They include grain boundaries’ orientation and misorientation evaluation by transmission Kikuchi diffraction (TKD) and atomic scale analysis of segregation at grain boundaries by atom probe microscopy (APM). For each of these techniques, systematic investigations were carried out to optimise specimen preparation methods, data acquisition and analysis parameters. This resulted in fundamental knowledge that could be adopted to st

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15

Zhou, Jing. "An Atom-Probe Tomography Study of Phase Separation in Fe-Cr Based Steels." Doctoral thesis, KTH, Metallografi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150796.

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Stainless steels are very important engineering materials in a variety of applications such as in the food industry and nuclear power plants due to their combination of good mechanical properties and high corrosion resistance. However, ferrite-containing stainless steels are sensitive to the so-called ‘475°C embrittlement’, which is induced by phase separation of the ferrite phase, where it decomposes into Fe-rich ferrite (α) and Cr-rich ferrite (α'). The phase separation is accompanied with a severe loss of toughness. Therefore, the upper service temperature of ferrite-containing stainless st

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16

La, Fontaine Alexandre Jacques. "Understanding the structure of minerals at the atomic scale: a new perspective enabled by advanced microscopy." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15484.

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From oxides to ores and rocks, minerals are the most prevalent materials on Earth. The majority of their properties are the direct result of their microstructure. The investigation of their structure at the nano and micron scale is routinely carried out using techniques such as optical and electron microscopy, X-ray diffraction or secondary ion mass spectrometry. However, these techniques are usually limited in resolution, either spatially or chemically. More recently, atom probe tomography (APT) has emerged as a powerful microscopy technique that can provide 3D maps showing the position and a

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17

Muller, Michael. "Performance, optimisation and applications of pulsed laser atom probe tomography for compound semiconductor analysis." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540147.

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Luo, Ting. "Study of the mechanisms of silicide formation by isotope diffusion and atom probe tomography." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0413.

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Avec la réduction de taille des composants microélectroniques, le monosiliciure de nickel (NiSi) a été largement utilisé dans les transistors CMOS (Complementary-Metal-Oxide-Semiconductor) en tant que contacts pour les sources, drains et grilles. Cependant, NiSi se dégrade lors du recuit à haute température. Il apparait essentiel d'étudier la séquence de formation de phases et la stabilité du monosilicide en présence d’éléments d'alliage. Les réactions à l'état solide entre des films de Ni allié en W et/ou Pt et un substrat de Si ont été étudiées principalement par diffraction des rayons X (DR

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19

Bouchikhaoui, Houari [Verfasser], and Guido [Akademischer Betreuer] Schmitz. "Nanoanalysis by atom probe tomography of tunnel magnetoresistive (TMR) structures / Houari Bouchikhaoui ; Betreuer: Guido Schmitz." Münster : Universitäts- und Landesbibliothek Münster, 2016. http://d-nb.info/1141577747/34.

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Qu, Jiangtao. "Atom-Scale Insights into III-V Semiconductor Nanowires." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/17851.

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As the feature size of MOSFET is scaling down to nano-size, series of problems need to be overcome to continue Moore’ Law, which seems an impossible task with traditional bulk Si technology due to the physical limitation and various negative effects being subject to small feature size. The critical issues for both further improving the devices’ performance and lowering their cost lie in the exploration of substitutions for Si and the control of morphological and compositional properties of materials. group III-V nanowires due to its unique properties are considered as the building block for ne

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21

Mazumder, Baishakhi. "Physics of the field evaporation of poor conducting materials in the Laser assisted Atom Probe Tomography." Rouen, 2010. http://www.theses.fr/2010ROUES039.

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La sonde atomique assistée par laser est une technique de nano analyse 3D qui donne des informations à l'échelle atomique avec une résolution spatiale nanométrique. Les phénomènes physiques sous-jacents les mécanismes d'évaporation de ces matériaux mauvais conducteurs sont très complexes en raison de la structure électronique de ces types de matériaux. Ce travail porte sur l'étude de l'évaporation de matériaux mauvais conducteurs à partir de semi-conducteurs (Si, SiC, GaAs et InP) jusqu'aux oxydes (MgO, TiO2 et HfO2). Les atomes de la surface de l'échantillon préparé sous forme de pointe sont

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Bilal, Huma. "Atomic Scale Microscopy of Zr-based Bulk Metallic Glasses Processed by Various Routes." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29908.

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Bulk metallic glasses (BMGs) exhibit a rare combination of strength and toughness that is difficult to achieve by other materials. These properties make them favourable for a diverse range of engineering applications. However, their disordered amorphous structure invokes catastrophic failure with shear bands localisation, limiting their industrial development as structural materials. Moreover, it is not yet clear how to quantitatively link their microstructural features to processing and mechanical properties. The aim of this thesis was to quantitatively analyse the structural features contrib

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Yun, Fan. "Understanding the Hidden Pathways of Human Tooth Decay at the Atomic Scale." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/24957.

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Dental caries, also known as tooth decay, is the most prevalent human chronic disease worldwide. Understanding the pathways and mechanisms of human tooth decay is central to the development of both prophylaxes and treatments, but only limited information is presently available about the initiation of caries at the nanoscale. In the present thesis, atom probe tomography 3D chemical maps and high-resolution transmission electron microscopy images managed to provide three distinct initial sites for human dental enamel dissolution: a) along the central dark line (CDL) within carbonated apatite na

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24

Huyan, Fei. "A study of "475°C embrittlement" in Fe-20Cr and Fe-20Cr-X (X=Ni, Cu, Mn) alloys." Thesis, KTH, Metallografi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118155.

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The “475°C embrittlement” occurring in ferritic and duplex stainless steel is considered to be detrimental and it limits the application of ferritic and duplex stainless steel at elevated temperatures, i.e., above about 300°C . In this study, the effect from alloying elements Ni, Cu and Mn on 475°C embrittlement was examined based on microhardness measurement and Charpy V-notch tests as well as atom probe tomography (APT). It was found that, after aging for 10h, 3% Ni accelerates the ferrite decomposition dramatically, 5% Mn has minor effect and no effect of 1.5% Cu was seen. The hardness incr

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DeGeorge, Vincent G. "Chemical Partitioning and Resultant Effects on Structure and Electrical Properties in Co-Containing Magnetic Amorphous Nanocomposites for Electric Motors." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/885.

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chemical partitioning of Cobalt-containing soft magnetic amorphous and nanocomposite materials has been investigated with particular focus on its consequences on these materials’ nanostructure and electrical resistivity. Theory, models, experiment, and discussion in this regard are presented on this class of materials generally, and are detailed in particular on alloys of composition, (Fe65Co35)79.5+xB13Si2Nb4-xCu1.5, for X={0- 4at%}, and Co-based, Co76+YFe4Mn4-YB14Si2Nb4, for Y={0-4at%}. The context of this work is within the ongoing efforts to integrate soft magnetic metal amorphous and nano

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Zelenty, Jennifer Evelyn. "Effects of nickel and manganese on the embrittlement of low-copper pressure vessel steels." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:28b9151f-1644-470b-abc7-48ff82bcffdd.

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Solute clustering is known to play a significant role in the embrittlement of reactor pressure vessel (RPV) steels. When precipitates form they impede the movement of dislocations, causing an increase in hardness and a shift in the ductile-brittle transition temperature. Over time this can cause the steel to become brittle and more susceptible to fracture. Thus, understanding precipitate formation is of great importance to the nuclear industry. The first part of this thesis aims to isolate and better understand the thermal aging component of embrittlement in low copper, model RPV steels. Curre

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He, Mengwei. "Microstructure-Property Relationships in CoCrNi-Based High Entropy Alloys: From the Atomic-Scale." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29466.

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High entropy alloys (HEAs) have attracted enormous research interest world-wide because of their intriguing compositional make-up, and because of their potential as structural materials in extreme environments such as extremes of temperature, neutron fluence, mechanical wear, and cyclic deformation A key challenge in the study of HEAs remains the desire to measure the detail of the atomic neighbourhoods. This thesis proposes a new framework for the quantification of short range order (SRO) and reveals processing-SRO-mechanical property relationships in a CoCrNi-based ternary HEA. Having esta

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Dagan, Michal. "3D field ion microscopy and atom probe tomography techniques for the atomic scale characterisation of radiation damage in tungsten." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:a575ff83-9101-499e-a54d-23d59f0d4d16.

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In this work, new reconstruction and analysis methods were developed for 3D field ion microscopy (FIM) data, motivated by the goal of atomic scale characterisation of radiation damage for fusion applications. A comparative FIM/ atom probe tomography (APT) study of radiation damage in self-implanted tungsten revealed FIM advantages in atomistic crystallographic characterisation, able to identify dislocations, large vacancy clusters, and single vacancies. While the latter is beyond the detection capabilities of APT, larger damage features were observed indirectly in APT data via trajectory aberr

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Chang, Yanhong [Verfasser], Dierk [Akademischer Betreuer] Raabe, and Sandra [Akademischer Betreuer] Korte-Kerzel. "Characterization of H/D in Ti and its alloys with atom probe tomography / Yanhong Chang ; Dierk Raabe, Sandra Korte-Kerzel." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1195238029/34.

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Zschiesche, Hannes. "Formation and segregation in cobalt silicide and manganese germanide thin films : correlative study by electron microscopy and atom probe tomography." Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0219.

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Dans cette thèse, des formations des germaniures de manganèse et des disiliciures de cobalt en couche minces ont été étudié comme la structure et chimie. Dans le système Mn-Ge, deux nouvelles relations entre des grains du Mn5Ge3 et (111)Ge ont été identifiées. De plus, il a été montré que la pureté du Mn5Ge3 dans les couches déposées par pulvérisation cathodique magnétron dépend du mécanisme de croissance. Une diffusion réactive donne du Mn5Ge3 presque pure tandis qu’une réaction non-diffusive donne du Mn5Ge3 qui contient la plupart des impuretés de la pulvérisation cathodique magnétron. Dans

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Weber, Juliane Verfasser], Dirk [Akademischer Betreuer] Bosbach, and Georg [Akademischer Betreuer] [Roth. "Fundamental insights into the radium uptake into barite by atom probe tomography and electron microscopy / Juliane Weber ; Dirk Bosbach, Georg Roth." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1157122507/34.

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Weber, Juliane [Verfasser], Dirk Akademischer Betreuer] Bosbach, and Georg [Akademischer Betreuer] [Roth. "Fundamental insights into the radium uptake into barite by atom probe tomography and electron microscopy / Juliane Weber ; Dirk Bosbach, Georg Roth." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1157122507/34.

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Lotharukpong, Chalothorn. "Defect characterisation in multi-crystalline silicon." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:a803fada-2296-41c3-9d96-864c186957a2.

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Electron beam induced current (EBIC) and atom probe tomography (APT) were used in this study to determine electrical activities and impurity compositions at extended defects in multicrystalline silicon (mc-Si) samples. The results provide, for the first time, information regarding the chemical species present at defects whose electrical activity has previously been measured. A new APT specimen fabrication process was developed with the ability to select a specific defect for APT analysis. Development of the APT specimen fabrication process proceeded by first selecting and optimising the prefer

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Hwang, Junyeon Kaufman M. J. "Characterization and mechanical properties of nanoscale precipitates in modified Al-Si-Cu alloys using transmission electron microscopy and 3D atom probe tomography." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3661.

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Hwang, Junyeon. "Characterization and Mechanical Properties of Nanoscale Precipitates in Modified Al-Si-Cu Alloys Using Transmission Electron Microscopy and 3D Atom Probe Tomography." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc3661/.

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Among the commercial aluminum alloys, aluminum 319 (Al-7wt%Si-4wt%Cu) type alloys are popularly used in automobile engine parts. These alloys have good casting characteristics and excellent mechanical properties resulting from a suitable heat treatment. To get a high strength in the 319 type alloys, grain refining, reducing the porosity, solid solution hardening, and precipitation hardening are preferred. All experimental variables such as solidification condition, composition, and heat treatment are influence on the precipitation behavior; however, precipitation hardening is the most signific

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Meher, Subhashish. "Comparative Coarsening Kinetics of Gamma Prime Precipitates in Nickel and Cobalt Base Superalloys." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699871/.

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The increasing technological need to push service conditions of structural materials to higher temperatures has motivated the development of several alloy systems. Among them, superalloys are an excellent candidate for high temperature applications because of their ability to form coherent ordered precipitates, which enable the retention of high strength close to their melting temperature. The accelerated kinetics of solute diffusion, with or without an added component of mechanical stress, leads to coarsening of the precipitates, and results in microstructural degradation, limiting the durab

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Mühlbacher, Marlene. "High-resolution characterization of TiN diffusion barrier layers." Licentiate thesis, Linköpings universitet, Tunnfilmsfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-120394.

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Titanium nitride (TiN) films are widely applied as diffusion barrier layers in microelectronic devices. The continued miniaturization of such devices not only poses new challenges to material systems design, but also puts high demands on characterization techniques. To gain understanding of diffusion processes that can eventually lead to failure of the barrier layer and thus of the whole device, it is essential to develop routines to chemically and structurally investigate these layers down to the atomic scale. In the present study, model TiN diffusion barriers with a Cu overlayer acting as th

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Wang, Danqi. "LOW-TEMPERATURE GAS-PHASE CARBURIZING AND NITRIDING OF 17-7 PH STAINLESS STEEL." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1386165240.

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Lambeets, Sten. "Hydrogénation catalytique du CO2 sur le rhodium :étude des processus en surface et sous-surface par techniques d’émission de champ." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/263477.

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Ce travail de thèse propose une investigation des dynamiques régissant la réactiond’hydrogénation du dioxyde de carbone sur une nanoparticule modèle de rhodium àl’échelle moléculaire. Cette recherche s’inscrit dans le contexte de la valorisation du CO2 parla voie catalytique. Une meilleure compréhension de la relation entre la structurecristallographique de la surface et les mécanismes réactionnels permettrait, à terme,d’améliorer l’optimisation des matériaux catalytiques. Dans ce but, la réaction est étudiée àl’échelle moléculaire sur une nanoparticule modèle de rhodium. Sa surface est observ

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Yu, Xinghua. "Characterization and Modeling of Heat Affected Zone Microstucture in a Blast Resistant Steel." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1262201157.

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Naber, Christoph [Verfasser], Jürgen [Akademischer Betreuer] Neubauer, and Jürgen [Gutachter] Neubauer. "Hydration kinetics of tricalcium silicate: A dataset for reaction rate calculations and nanoscale analysis employing atom probe tomography / Christoph Naber ; Gutachter: Jürgen Neubauer ; Betreuer: Jürgen Neubauer." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2019. http://d-nb.info/1176809806/34.

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Eder, Katja Daniela. "Surfaces and interfaces in nano-scale and nano-structured materials." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/17217.

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In this thesis, advanced characterisation methods, including atom probe tomography (APT) and transmission Kikuchi diffraction (TKD) were employed to study surface and interfaces in a range of nano-scale and nano-structured materials. These techniques were used to measure solute segregation towards grain boundaries and to explore the relationship between grain boundary segregation and grain boundary mobility. APT was also used to characterise the structure of nanoparticles used as catalysts, and the adsorption behaviour of sulphur on catalytic surfaces, to gain more information about the struct

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Chen, Hansheng. "Correlating the microstructure, magnetic domain structure, and magnetic properties of rare earth permanent magnets." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18996.

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Rare earth permanent magnets have been broadly integrated into various applications, such as advanced electric motor technologies which partly relieve the current energy crisis worldwide by taking advantages of their extraordinary magnetic properties. Traditional approaches for increasing the intrinsic coercivity (Hci) of rare earth permanent magnets typically come at the expense of remanence, resulting in a reduction of maximum magnetic energy product [(BH)max]. Therefore, novel design and processing strategies are in urgent need to circumvent this trade-off in the advanced rare earth permane

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Xiong, Wei. "Thermodynamic and Kinetic Investigation of the Fe-Cr-Ni System Driven by Engineering Applications." Doctoral thesis, KTH, Termodynamisk modellering, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-96707.

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This work is a thermodynamic and kinetic study of the Fe-Cr-Ni system as the core of stainless steels. The Fe-Cr, Fe-Ni and Cr-Ni systems were studied intensively using both computational and experimental techniques, including CALPHAD (CALculation of PHAse Diagrams), phase field simulation, ab initio modeling, calorimetry, and atom probe tomography. The purpose of this thesis is to reveal the complexity of the phase transformations in the Fe-Cr-Ni system via the integrated techniques. Due to the importance of the binary Fe-Cr system, it was fully reassessed using the CALPHAD technique by incor

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Zhou, Jing. "Experimental study of phase separation in Fe-Cr based alloys." Licentiate thesis, KTH, Metallografi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119230.

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Duplex stainless steels (DSSs) are important engineering materials due to their combination of good mechanical properties and corrosion resistance. However, as a consequence of their ferrite content, DSSs are sensitive to the so-called ‘475°C embrittlement’, which is induced by phase separation, namely, the ferrite decomposed into Fe-rich ferrite (α) and Cr-rich ferrite (α'), respectively. The phase separation is accompanied with a severe loss of toughness. Thus, the ‘475°C embrittlement’ phenomenon limits DSSs’ upper service temperature to around 250°C. In the present work, Fe-Cr binary model

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Johnson, Lars. "Nanostructuring and Age Hardening in TiSCN, ZrAlN, and TiAlN Thin Films." Licentiate thesis, Linköpings universitet, Tunnfilmsfysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-56221.

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This thesis explores nanostructuring in TiSiCN, ZrAlN, and TiAlN thin films deposited by cathodic arc evaporation onto cemented carbide substrates, with intended applications for cutting tools. The three systems were found to exhibit age hardening upon annealing, by different mechanisms, into the superhard regime (≥30 GPa), as determined by a combination of electron microscopy, X-ray diffraction, atom probe tomography, erda, and nanoindentation tech- niques. TiSiCN forms nanocomposite films during growth by virtue of Si segregation to the surface of TiCN nanocrystallites while simultaneously p

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Gwalani, Bharat. "Developing Precipitation Hardenable High Entropy Alloys." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011755/.

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High entropy alloys (HEAs) is a concept wherein alloys are constructed with five or more elements mixed in equal proportions; these are also known as multi-principle elements (MPEs) or complex concentrated alloys (CCAs). This PhD thesis dissertation presents research conducted to develop precipitation-hardenable high entropy alloys using a much-studied fcc-based equi-atomic quaternary alloy (CoCrFeNi). Minor additions of aluminium make the alloy amenable for precipitating ordered intermetallic phases in an fcc matrix. Aluminum also affects grain growth kinetics and Hall-Petch hardenability.

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Shrestha, Sachin. "Characterising the effect of Niobium-rich clusters on the microstructure-property relationships in CASTRIP® steels." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10297.

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Many properties of steels, especially those that are important for engineering purposes, are determined by their microstructures. Therefore the key driver to controlling properties of these materials lies within the characterisation and manipulation of their microstructure down to their atomic-scale structure. For industrial product development, strength and ductility are considered to be the most important properties and are highly ‘microstructure sensitive’. This thesis investigates the effect of niobium microalloying and clustering on the microstructure-property relationship of ultra-thin s

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Di, russo Enrico. "Etude de biais de mesure de composition par SAT dans les matériaux semi-conducteurs." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMR065/document.

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La Sonde Atomique Tomographique (SAT) assistée par laser (La-APT) est un outil puissant pour étudier la distribution atomique 3D des espèces chimiques dans une grande variété de matériaux semi-conducteurs. Cependant, des biais de composition importants affectent les analyses de sondes atomiques révélant une composition non stœchiométrique. Dans cette thèse, une étude systématique de certains semi-conducteurs binaires (GaN, GaAs, ZnO) et ternaires (AlGaN, MgZnO) a été menée afin de: (i) obtenir une description cohérente des biais de composition en APT; (ii) identifier les mécanismes physiques à

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El, Kousseifi Mike. "Ni silicide contacts : Diffusion and reaction in nanometric films and nanowires." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4349.

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Cette thèse porte sur l'étude des phénomènes qui se produisent lors de la réaction métal-silicium (siliciuration) en couches minces et dans des nanofils. En effet, les phénomènes tels que la germination, la croissance latérale, la croissance normale et la diffusion doivent être compris pour réaliser les contacts des futurs dispositifs de la microélectronique. La comparaison entre la siliciuration en couches minces et dans les nanofils est l'un des principaux aspects de ce travail. La distribution atomique en 3D des éléments chimiques dans les différentes siliciures de Ni a été obtenue par sond

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