Andreas Leineweber
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View article: Structure relationships between the binary fcc and bcc superstructures
Structure relationships between the binary fcc and bcc superstructures Open
The development of superstructures derived from simple crystal structures under equilibrium conditions provides valuable information about the energetics of the atomic interactions. Moreover, collective deformation processes of superstruct…
View article: Reactive Interaction and Wetting of Fe‐ and Mn‐Containing, Secondary AlSi Alloys with Manganese Oxide Ceramic Filter Material for Fe Removal
Reactive Interaction and Wetting of Fe‐ and Mn‐Containing, Secondary AlSi Alloys with Manganese Oxide Ceramic Filter Material for Fe Removal Open
Fe is an impurity element in secondary, i.e., recycled AlSi‐cast alloys deteriorating castability and mechanical properties due to formation of intermetallic particles. Fe removal can be achieved by binding Fe into Fe‐containing, primary …
View article: Comment on Hajra et al.: “High-temperature phase stability and phase transformations of Niobium-Chromium Laves phase: Experimental and first-principles calculation”
Comment on Hajra et al.: “High-temperature phase stability and phase transformations of Niobium-Chromium Laves phase: Experimental and first-principles calculation” Open
This work comments on a recent publication by Hajra et al. (Mater. Design 236 (2023) 112483), which claims to have presented compelling experimental and theoretical evidence in favour of the existence of an equilibrium C14-NbCr2 high-tempe…
View article: Comparative Plasma Nitrocarburizing of AISI 316L and AISI 304 Steels Using a Solid Carbon Active Screen: Differences in the Developing Microstructures
Comparative Plasma Nitrocarburizing of AISI 316L and AISI 304 Steels Using a Solid Carbon Active Screen: Differences in the Developing Microstructures Open
This paper features a direct comparison of the response of AISI 316L and AISI 304 austenitic stainless steels to active screen plasma nitrocarburizing applied for a wide range of treatment temperatures from 380 °C to 480 °C (653 K to 753 K…
View article: Thermally induced microstrain broadening in hexagonal zinc
Thermally induced microstrain broadening in hexagonal zinc Open
Neutron powder-diffraction experiments on polycrystalline hexagonal zinc show considerable temperature-dependent line broadening. Whereas as-received zinc at 300 K exhibits narrow reflections, during cooling to a minimum temperature of 10K…
View article: Dealing with Fe in Secondary Al-Si Alloys Including Metal Melt Filtration
Dealing with Fe in Secondary Al-Si Alloys Including Metal Melt Filtration Open
Fe is a detrimental impurity element in secondary, i. e. recycled, Al–Si cast alloys (Zhang et al. in Miner. Process. Extr. Metall. Rev. 33:99, 2012;Raabe et al. in Prog. Mater. Sci. 128, 2022;). It leads to decrease of castability and pro…
View article: Thermodynamically Guided Improvement of Fe–Mn–Al–Ni Shape‐Memory Alloys
Thermodynamically Guided Improvement of Fe–Mn–Al–Ni Shape‐Memory Alloys Open
A microstructural informed thermodynamic model is utilized to tailor the pseudoelastic performance of a series of Fe–Mn–Al–Ni shape‐memory alloys. Following this approach, the influence of the stability and the amount of the B 2‐ordered pr…
View article: Escape our Lab: creating an escape room game in the field of materials science and crystallography
Escape our Lab: creating an escape room game in the field of materials science and crystallography Open
Although many challenges of the 21st century need solutions which are directly connected with the development of new technologies, the preferences of prospective students in Germany are often far from mathematics, physics and chemistry. Mo…
View article: Ni<sub>3</sub>Sn<sub>4</sub> and FeAl<sub>2</sub> as vacancy variants of the W-type (“bcc”) structure
Ni<sub>3</sub>Sn<sub>4</sub> and FeAl<sub>2</sub> as vacancy variants of the W-type (“bcc”) structure Open
Systematization of the vast number of known crystal structures of intermetallic phases is a challenge. One previously proposed group is referred to here as vacancy variants of the W-type structure. Members of this group, may, however, not …
View article: The Cu–Sn System: A Comprehensive Review of the Crystal Structures of its Stable and Metastable Phases
The Cu–Sn System: A Comprehensive Review of the Crystal Structures of its Stable and Metastable Phases Open
The present works assesses the knowledge concerning the crystal structures of phases in the Cu–Sn system having their high relevance due to their occurrence in bronze alloys and soldered systems. The crystal structures of the terminal soli…
View article: Mechanism of Layer Formation during Gas Nitriding of Remelted Ledeburitic Surface Layers on Unalloyed Cast Irons
Mechanism of Layer Formation during Gas Nitriding of Remelted Ledeburitic Surface Layers on Unalloyed Cast Irons Open
Unalloyed cast iron materials exhibit low tribological and corrosive resistance. In this respect, nitriding has a wide range of applications for steels. In the case of cast iron, the advantageous properties of nitrided layers are impaired …
View article: Magnetic phase separation in the EuPdSn<sub>2</sub>ground state
Magnetic phase separation in the EuPdSn<sub>2</sub>ground state Open
The chemical bonding, structural and magnetic properties of EuPdSn 2 have been investigated by DFT, synchrotron X-ray and neutron powder diffraction and 151 Eu Mössbauer spectroscopy.
View article: Formation of a nanoscale two-phase microstructure in Cu–Zn( Al) samples with macroscopic concentration gradient
Formation of a nanoscale two-phase microstructure in Cu–Zn( Al) samples with macroscopic concentration gradient Open
In binary CuZn and ternary Cu–Zn–Al with 1.5 wt% Al, the formation of a nanoscale two-phase α + ordered β2 microstructure is observed after quenching samples with a macroscopic solute concentration gradient from 875 °C in iced brine. The t…
View article: Revisiting the phase transformations involving Cu<sub>6</sub>Sn<sub>5</sub> intermetallic: resolving local domain structures induced by ordering
Revisiting the phase transformations involving Cu<sub>6</sub>Sn<sub>5</sub> intermetallic: resolving local domain structures induced by ordering Open
Cu 6 Sn 5 is one of the most important intermetallics present in solder joints based on Cu and Sn. Due to still uncertain reasons for failure of these joints, detailed microstructural research can help to figure out the underlying mechanis…
View article: Interplay between Habit Plane and Orientation Relationship in an Electron Backscatter Diffraction Analysis: Using the Example of η′-Al8Fe3 in η-Al5Fe2
Interplay between Habit Plane and Orientation Relationship in an Electron Backscatter Diffraction Analysis: Using the Example of η′-Al8Fe3 in η-Al5Fe2 Open
The Al5Fe2 intermetallic rouses interest due to its rapid formation at the interface between iron/steel and aluminum by reactive interdiffusion. Only in the last few years have the differently ordered states of that intermetallic been eluc…
View article: Effect of Cu on Nitriding of α-Fe
Effect of Cu on Nitriding of α-Fe Open
Nitriding of Fe-1 wt.% Cu and Fe-5 wt.% Cu alloys at 813 K leads to the formation of predominantly the γ′-iron nitride phase (γ′-Fe4N) when using nitriding conditions, which lead to pronounced formation of ε-iron nitride phase (ε-Fe3N1+x) …
View article: CSD 2103462: Experimental Crystal Structure Determination
CSD 2103462: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: CSD 2103459: Experimental Crystal Structure Determination
CSD 2103459: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: CSD 2103463: Experimental Crystal Structure Determination
CSD 2103463: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…