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• W6465119 abstract "The site occupation of ternary elements in an intermetallic phase is an important area in materials science. Up to now X-Ray based methods and a TEM based method called Atom Location by Channeling Enhanced Microanalysis (ALCHEMI) were available. This work focuses on a new Atom Probe Tomography (APT) based method. In comparison to ALCHEMI it has the advantage, that light elements, like Lithium, can be investigated and different isotopes can be examined independently. Additionally it is possible to analyze the evolution of the site occupation parameter within a grain with a concentration gradient reaching a spatial resolution which is better by one order of magnitude compared to ALCHEMI. Under optimal conditions few nm3 can be sufficient to determine the site occupation with the method presented in this work.As a model system Titanium-Aluminum alloys are examined. Within this work the emphasis is placed on the L10-phase, which exhibits a superstructure direction with a sequence of pure Al- and pure Ti-planes. For this phase the influence of Nb, Cr and Ag additions on the field evaporation process and the site occupation is presented. The observed atom probe tomography data often does not allow to directly identify different planes in this superstructure direction. To be able to get information on the site occupation a new statistical method is introduced, which allows giving quantitative information about the site occupation.To check, whether the interpretation of the experimental results, especially considering the site occupation, is correct, field evaporation simulations were conducted. For this, field evaporation field strengths according to the Mueller-Schottky method, which considers ionization energy, work function and sublimation energy, are calculated. Within this work the sublimation energy is replaced by a term that considers the local binding situation. This enables a much more accurate prediction of the effects of the ordering parameter and the addition of ternary elements. Furthermore it becomes possible to quantitatively compare the results for different crystallographic directions. This allows by comparing the simulation to experimental results- to estimate the A-B-binding energy in L12-Cu3Au. To confirm the resulting value a density functional theory based method is used to calculate binding energies, as well. The results are in good agreement with the other method." @default.
• W6465119 created "2016-06-24" @default.
• W6465119 creator A5071973654 @default.
• W6465119 date "2022-02-20" @default.
• W6465119 modified "2023-09-30" @default.
• W6465119 title "Bestimmung von Platzbesetzung und Bindungsenergien mittels Atomsondentomographie" @default.
• W6465119 doi "https://doi.org/10.53846/goediss-2717" @default.
• W6465119 hasPublicationYear "2022" @default.
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