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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials III
Presentation Title Atom Probe Tomography of Refractory High Entropy Alloys
Author(s) Patrick Callahan, David Beaudry, Noah Philips, Keith E Knipling
On-Site Speaker (Planned) Patrick Callahan
Abstract Scope High entropy alloys (HEAs) typically contain five or more principal elements in nearly equiatomic proportions, significantly expanding the composition space and attainable properties of novel metallic materials. Despite the potential advantages of HEAs, fundamental questions remain, particularly regarding the mechanisms of dislocation motion and diffusion in these alloys. Atom-probe tomography (APT) is a precise atom-by-atom investigation of a sample and produces 3D reconstructions with sub-nanometer resolution, chemical sensitivities near 10 ppm, and volumes approaching 2502501000 nm^3. This provides uniquely powerful insights into phenomena such as atomic clustering, short range order, and anti-clustering, which are not yet well understood in HEAs. However, these analyses require optimum spatial and spectral data and in this talk we present the effects of APT laser pulse energy, laser pulse frequency, and specimen tip base temperature on the analysis yield, data quality, and the propensity for generating complex ions in equiatomic MoTaTiZrW and HfNbTaTiZr refractory HEAs.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


A Review of Atom Probe Tomography Technology: The Present and Future
APT-based Stoichiometry Measurements of Single Crystal ThO2
APT for Atomic-scale Insights to the Origins of Materials Properties
Atom Probe Tomography of Refractory High Entropy Alloys
Atom Probe Tomography Study of Fission Products in Neutron Irradiated U-Mo Fuel
Characterization of Mechanical Properties of the A356 Cast Aluminum Alloy in Accordance with the Cluster Formation Behaviors at Different Aging Temperatures
Compositional Dependencies of Ni- and Fe-oxides to Experimental Parameters in Atom Probe Tomography
Coupled APT and TEM Investigation of Cu Assisted Nucleation of L12 Precipitates in FCC-based High Entropy Alloys
Elucidating Solute Clustering and Precipitation of Al-Cu-Mg-Ag-Si Model Alloys
Material Alterations in Intense Mechanical and Chemical Contacts
Morphological Classification of Dense Objects in Atom Probe Tomography Data
Nanoparticle Sample Preparation for Atom Probe Tomography: Chemical Fixation and Cryo-Fixation
Quantifying Compositional Uncertainty Arising from Peak Overlaps
Understanding Early Stages of Nanoscale Hydriding and Oxidation Mechanisms in Metallic Systems via Atom Probe Tomography and Multimodal Chemical Imaging

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