A5001456800- Advanced Materials Characterization Techniques
- Hydrogen embrittlement and corrosion behaviors in metals
- Force Microscopy Techniques and Applications
- Diamond and Carbon-based Materials Research
- Electron and X-Ray Spectroscopy Techniques
- Metal and Thin Film Mechanics
- Ion-surface interactions and analysis
- High Temperature Alloys and Creep
- Fusion materials and technologies
- Welding Techniques and Residual Stresses
- Advanced materials and composites
- Aluminum Alloy Microstructure Properties
- Metal Alloys Wear and Properties
- Minerals Flotation and Separation Techniques
- Nuclear Materials and Properties
- Surface and Thin Film Phenomena
- Theoretical and Computational Physics
- Metallic Glasses and Amorphous Alloys
Max-Planck-Institut für Nachhaltige Materialien
2020-2024
Titanium (Ti) and its alloys are attractive for a wide variety of structural functional applications owing to excellent specific strength, toughness stiffness, corrosion resistance. However, if exposed hydrogen sources, these susceptible hydride formation in the form TiHx (0 < x ≤ 2), leading crack initiation mechanical failure due lattice deformation stress accumulation. The kinetics hydriding process depends on several factors, including critical saturation threshold within Ti, interaction...
Atom probe tomography is often introduced as providing "atomic-scale" mapping of the composition materials and such exploited to analyse atomic neighbourhoods within a material. Yet quantifying actual spatial performance technique in general case remains challenging, they depend on material system being investigated well specimen's geometry. Here, by using comparisons with field-ion microscopy experiments imaging field evaporation simulations, we provide basis for critical reflection atom...
Abstract
Abstract Atom probe tomography (APT) helps elucidate the link between nanoscale chemical variations and physical properties, but it has a limited structural resolution. Field ion microscopy (FIM), predecessor technique to APT, is capable of attaining atomic resolution along certain sets crystallographic planes albeit at expense elemental identification. We demonstrate how two commercially available atom instruments, one with straight flight path fitted reflectron lens, can be used acquire...
Abstract Retrieving information on the chemical and bonding states of atoms in a material three-dimensions is challenging even for most advanced imaging techniques. Here, we demonstrate that this accessible via straight-flight-path atom probe tomography experimental data, however it requires additional processing. Using an activation energy model involves linear field dependance, complementing with DFT simulations, extract ion loss related to kinetics evaporation process from mass peak...
Abstract Chemically resolved atomic resolution imaging can give fundamental information about material properties. However, even today, a technique capable of such achievement is still only an ambition. Here, we take further steps in developing the analytical field ion microscopy (aFIM), which combines spatial (FIM) with time-of-flight spectrometry atom probe tomography (APT). To improve performance aFIM that are limited part by high level background, implement bespoke flight path...
Abstract Stacking faults (SFs) are important structural defects that play an essential role in the deformation of engineering alloys. However, direct observation SFs at atomic scale can be challenging. Here, we use analytical field ion microscopy, including density functional theory–informed contrast estimation, to image local elemental segregation a creep-deformed solid-solution single-crystal alloy Ni–2 at% W. The segregated atoms imaged brightly, and time-of-flight spectrometry allows for...
Three-dimensional field ion microscopy is a powerful technique to analyze material at truly atomic scale. Most previous studies have been made on pure, crystalline materials such as tungsten or iron. In this article, we study more complex materials, and present the first images of an amorphous sample, showing capability visualize compositional fluctuations compatible with theoretical medium order in metallic glass (FeBSi), which extremely challenging observe directly using other techniques....
Real-space, atomic-scale imaging of materials and their defects remains a daunting challenge.In this study, we introduce the Analytical Field Ion Microscope (aFIM) [1].This new hybrid experimental technique can provide atomically chemically resolved three-dimensional spatial information for metals alloys.The aFIM combines superior resolution (FIM) chemical discrimination capabilities Atom Probe Tomography (APT).We discuss theoretical advances necessary technique.In protocol, explore ability...
Abstract Identifying the chemical and bonding state of all atoms in a material three-dimensions remains an unresolved issue. Here, we demonstrate that this information was always intrinsically present within atom probe tomography experimental data, but until now it overlooked or consciously suppressed. Using analytical model robust simulations, show mass peak shape contains on ion’s energy loss related to how bound surface, its neighbourhood. We introduce complete data processing approach,...