Dissertations / Theses on the topic 'Atom probe tomograpghy'
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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." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/4008.
Full textMarceau, 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.
Full textThe 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 designed for use with three-dimensional APT data. Prior to this detailed characterisation work, the actual thermal impact from both heat treatment and quenching of small, lab-scale specimens was determined through correlation of both experimental results and calculations that modelled the heat transfer conditions using the lumped capacitance method. Subsequently, the maximum diffusion distance by random walk of the solute atoms was calculated for these periods, bearing significance on the propensity for these atoms to have the ability to cluster together, rather than segregate to the dislocation loops in the microstructure, which have a relatively larger interspacing distance. Age-hardening curves for the Al-1.1Cu-xMg (x = 0, 0.2, 0.5, 0.75, 1.0, 1.7 at.%) alloys at 150ºC show that the rapid hardening phenomenon (RHP) exists for Mg compositions ≥ 0.5Mg. Given that zone-like precipitate structures were unable to be detected by TEM or APT during the early stages of ageing at 150ºC, and that statistically significant dispersions of clusters were found in the APT data after ageing for 60 s, the RHP is attributed to these clustering reactions. Identification of clusters in the APT data has been achieved using the core-linkage algorithm and they have been found to be quite small, containing only a few atoms up to a couple of tens of atoms. The RHP is governed by some critical number density of both Mg clusters and Cu-Mg co-clusters of a critical size, whereas Cu clusters do not contribute significantly to the hardening mechanism. Significance testing indicates that Mg clusters are more significant at smaller clusters sizes and Cu-Mg co-clusters more important at larger cluster sizes. Hardness results also confirm the existence of rapid early hardening during secondary ageing at 65ºC in Al-1.1Cu-1.7Mg. The mechanism of secondary rapid hardening involves a combination of both secondary clustering from solute (mainly Mg atoms) residual in solution, and pre-existing amorphous primary clusters that have slower growth kinetics at the lower secondary ageing temperature. The latter occurs mainly by vacancy-assisted diffusion of Mg atoms as evidenced by the gradual increase of the Mg:Cu ratio of co-clusters. From an alloy design point of view it is important to fully understand the solute distribution in the microstructure to be able to subsequently optimise the configuration for enhanced material properties. The change in dispersion of solute atoms during ageing was determined by combining calculations of % vacancy-solute associations with detailed measurements of the dislocation loops to estimate the solute distribution within the microstructure. The implication of the balance of solute atoms segregated to the loops compared with that in the matrix is then discussed in the context of hardnening mechanisms.
Withrow, Travis P. "Computational Modeling of Atom Probe Tomography." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1525763934302517.
Full textEngberg, 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.
Full textYang, 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.
Full textMcCarroll, Ingrid. "Corrosion Processes: Through the lens of atom probe tomography." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/18131.
Full textAraullo-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.
Full textBennett, 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.
Full textChen, 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.
Full textOberdorfer, 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.
Full textMontalvo, 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.
Full textInnocenti, 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.
Full textatom probe, LA-WATAP, field evaporation, femtosecond laser pulse interaction with nanoscale silicon objects, Sommerfeld's half plane problem, FDTD - Yee's scheme.
Zhang, Yi. "Three dimensional atom probe tomography of nanoscale thin films, interfaces and particles." [Ames, Iowa : Iowa State University], 2009.
Find full textSamudrala, Saritha Kowmudy. "Atomic scale analysis of nanocrystalline materials by advanced microscopy." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/13655.
Full textZhou, 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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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.
Full textMuller, 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.
Full textLuo, Ting. "Study of the mechanisms of silicide formation by isotope diffusion and atom probe tomography." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0413.
Full textWith the downscaling of microelectronic devices, NiSi has been widely used in complementary-metal-oxide-semiconductor (CMOS) transistors as contact on source, drain and gate. However, NiSi suffers from degradation upon annealing at high temperatures. Adding alloying elements is an effective method to increase the stability of nickel monosilicide but the formation sequence of Ni silicides is substantially modified. Therefore, the studies of the phase formation sequence and the stability of monosilicide are of great importance.The solid-state reactions between Ni films alloyed with W and/or Pt and Si substrates were studied mainly by in-situ X-ray diffraction (XRD) and atom probe tomography (APT) using combinatorial analysis of co-deposited gradient films. The phase sequence was monitored by in-situ XRD and APT was used to examine the silicides and reveal the redistribution of alloying elements. The content of alloying elements (W and Pt) has a large impact on the phase sequence of Ni silicides and the kinetics of phase formation. The basic agglomeration mechanism of NiSi thin films was studied. A 15nm pure Ni film was deposited on a Si substrate enriched with isotope multilayers. APT analyses were performed on the sample of Ni/Si (isotope) after an annealing at 600°C. By observing the distribution of Si isotopes (30Si, 29Si and 28Si), whether they maintain a multilayer structure or are mixed together, a mechanism of the agglomeration of NiSi was proposed. This was possible because of the unique capability of APT to observe isotopes in 3D at the atomic scale and it allows a better understanding and to control of the agglomeration of poly-crystalline compound thin films
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.
Full textQu, Jiangtao. "Atom-Scale Insights into III-V Semiconductor Nanowires." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/17851.
Full textMazumder, Baishakhi. "Physics of the field evaporation of poor conducting materials in the Laser assisted Atom Probe Tomography." Rouen, 2010. http://www.theses.fr/2010ROUES039.
Full textThe laser assisted atom probe tomography is a 3D nanoanalysing technique which gives information in the atomistic scale with sub nanometre spatial resolution. The physical phenomena underlying the field evaporation of poor conductive material is very complex due to the electronic structure of these types of materials. This work deals with the field evaporation study of poor conductive materials starting from semiconductors (Si, SiC, GaAs and InP= to insulating oxides (MgO, TiO2, and HfO2). The surface atoms from the tip shaped specimen are ionized by a standing electric field and the interaction of a femto-laser beam with the tip. The laser tip interaction increases the tip temperature locally, enabling the evaporation of surface atoms. Analyses are done varying different laser parameters (wavelength, energy, etc. ) to understand the underlying evaporation mechanism. Representative models have been developed to support our experimental results. The influence of wavelength and laser energy on the evaporation mechanisms of semiconductors and oxides are determined taking into account the influernce of optical absorption, band bending effect, etc. Various complex and diversified physical phenomena were observed ands understood during this study. Systematic studies, determining the analytical conditions for field evaporation of non conducting materials are evaluated to help future researchers working in related fields. Specifically one of the key factors is the surface optical absorption and the subsequent evaluation of the electron phonon coupling leading to thermal effects. The present thesis is a modest attempt to understand the field evaporation behaviour under femtosecond laser pulse and the physics involved in this framework by experimental results and corresponding interpretation
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.
Full textYun, 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.
Full textHuyan, 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.
Full textDeGeorge, 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.
Full textZelenty, 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.
Full textHe, 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.
Full textDagan, 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.
Full textChang, 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.
Full textZschiesche, 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.
Full textGermanide and silicide thin films have application in different field such as thermoelectricity, magnetism and/or microelectronics. This PhD thesis study the formation, structure and chemistry of Mn5Ge3 thin films, which is interesting due to its ferromagnetic property for possible spintronic devices, and of CoSi2 thin films, which are used as contact materials. Two new epitaxial relationships between Mn5Ge3 grains and (111)Ge have been identified. The chemical purity of Mn5Ge3 has been related to the deposition by magnetron sputtering: Mn5Ge3 thin films grown by reactive-diffusion are relatively pure while the significant incorporation of impurities in Mn5Ge3 grown by non-diffusive reaction is beneficial for the ferromagnetic property. Ti segregation to CoSi2 grain boundaries has been quantified in CoSi2 grown from a Co/Ti/Si thin film. Additionally, an inhomogeneous distribution of Ti at CoSi2 grain boundary has been related to the defect density. A method has been developed for correlative structural and chemical investigations at the atomic scale on selected interfaces. Finally, a method to quantify the triple junction segregation has been proposed
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.
Full textWeber, 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.
Full textLotharukpong, Chalothorn. "Defect characterisation in multi-crystalline silicon." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:a803fada-2296-41c3-9d96-864c186957a2.
Full textHwang, 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.
Full textHwang, 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/.
Full textMeher, 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/.
Full textMühlbacher, 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.
Full textWang, 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.
Full textLambeets, 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.
Full textDoctorat en Sciences
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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.
Full textNaber, 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.
Full textEder, Katja Daniela. "Surfaces and interfaces in nano-scale and nano-structured materials." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/17217.
Full textChen, 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.
Full textXiong, 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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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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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.
Full textGwalani, Bharat. "Developing Precipitation Hardenable High Entropy Alloys." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011755/.
Full textShrestha, 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.
Full textDi, 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.
Full textLaser-assisted Atom Probe Tomography (La-APT) is a powerful tool for investigating the 3D atomic distribution of the chemical species in a wide variety of semiconductor materials. However, important compositional biases affect atom probe analyses revealing a non-stoichiometric composition. In the thesis a systematic study of selected binary (GaN, GaAs, ZnO) and ternary (AlGaN, MgZnO) semiconductors of high technological interest was developed in order to: (i) obtain a coherent description of the compositional biases in APT; (ii) identify the physical mechanisms leading to these biases; (iii) assess the experimental conditions for which the compositional analysis is reliable. In order to interpret the results, the hypothesis of preferential evaporation of metallic species (Ga, Al, Zn, Mg) at high field and emission of neutral non-metallic molecules (N2, O2) at low field has been proposed. Another important aim of this thesis is materials physics-oriented. It is indeed of utmost importance to study both composition and morphology of some devices of technological interest, such as in multi-quantum-well systems. In this perspective, the knowledge of 3D composition field and morphology is essential because these features determine the optical and electrical properties of the systems. In order to do it, a correlative microscopy approach can be adopted. This approach was successfully applied to the study of ZnO/MgZnO multi-quantum wells designed for quantum cascade lasers. Structural, compositional and optical properties were investigated performing correlative La-APT - Electron Tomography (ET) - micro-PhotoLuminescence (µ-PL) on the same atom probe tip specimens. The complementary APT and ET analyses yield a clear picture of the structure and composition of the system investigated, revealing important decomposition phenomena in the MgZnO alloy. In particular, La-APT proved to be a unique technique for a direct assessment of local composition. Moreover, µ-PL also proved to be extremely useful in order to get information related the composition, supporting La-APT results. Finally, a new correlative in-situ approach in which La-APT and µ-PL are simultaneously performed is presented. Thanks to the development of a specially designed tomographic atom probe, it is shown that µ-PL can be successfully performed on a single Zno/MgZnO atom probe tip during La-APT. This is extremely attractive and challenging because allows to strictly correlating the variation photoluminescence signal with nano-metric scale volumes of the tip evaporated during APT. In principle, the emission of single quantum light emitters (i.e. single QW or QD) can be revealed. The new approach presented can be extended to a wide range of materials, opening new perspectives for correlative studies of single atom probe tips
El, Kousseifi Mike. "Ni silicide contacts : Diffusion and reaction in nanometric films and nanowires." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4349.
Full textThis thesis focuses on the phenomena that occur during the reaction between metal and silicon (silicide) on thin films and nanowires. Indeed, phenomena such as nucleation, lateral growth, normal growth and diffusion must be understood to make contacts for future microelectronic devices. The comparison between the silicide formation on thin films and nanowires is one of the main aspects of this work. Atomic distribution in 3D for the elements in different Ni silicide phase was obtained by atom probe tomography (APT). To enable the analysis of different types of silicon nanowires by APT, several original methods for sample preparation by focused ion beam has been developed and tested. On the other hand, in situ and real-time analysis by X-ray diffraction during the reactive diffusion helped to highlight the importance of the nucleation of a phase and to determine the kinetics of formation of Ni(Pt) silicides, including the reaction on the interfaces and the lateral growth. The characteristic shape associated with the lateral growth was determined by ex-situ transmission electron microscopy analyzes and was compared with the existing theoretical models. Moreover, the determination of the fastest diffusing species by APT provided information on the mechanisms of phase formation and stress relaxation in the silicide