Abstract High-harmonic generation (HHG) is used as a source for various imaging applications in the extreme ultraviolet spectral range. It offers spatially coherent radiation and unique elemental contrast with the potential for attosecond time resolution. The unfavorable efficiency scaling to higher…
The thermodynamic description of the Al-Cu system is reassessed considering metastable states of Al based alloys in rapid solidification. In previous work, only an improved thermodynamic description of the FCC phase was presented based on experimental results from electromagnetic levitation and simulation…
Powder materials are critical to numerous industrial applications, particularly in powder‐based additive manufacturing. Their thermal properties directly influence the building process and, consequently, the dimensional accuracy and surface quality of the fabricated components. The measurement of the…
Aluminum–lithium alloys offer significant potential for lightweight construction, exhibiting decreased density and improved specific stiffness as the lithium content increases. The specific stiffness of these alloys improves with lithium concentrations up to 14 at%, outperforming that of pure aluminum.…
Die Kombination von unterschiedlichen Materialien mit deutlich voneinander abweichenden physikalischen Eigenschaften, wie Metall-Metall (z. B. Stahl-Aluminium), Metall-Keramik oder Metall-Glas, kann Verbessungen in bestehenden Anwendungen ermöglichen oder sogar vollkommen neue Einsatzgebiete erschließen.…
The solidification of Inconel 718 alloy (IN718) from undercooled liquid is studied. The solidification kinetics is evaluated in melted and undercooled droplets processed using the electromagnetic levitation (EML) technique by the temperature–time profiles and solid/liquid (S/L) interface movement during…
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 precipitates on the stability of the austenitic state and the pseudoelastic…
Gefüge in Legierungen sind maßgeblich verantwortlich für die Eigenschaften des Werkstoffs. Form und Ausprägung von Gefügen, werden durch die Phasenumwandlungen bestimmt. Für eine gezielte Verbesserung von Werkstoffen ist deshalb ein tiefes Verständnis von Phasenumwandlungen notwendig. In vielen Legierungssystemen,…
The effect of Co vs. Fe content on early stages of oxidation in air was studied in Co-Cr-Fe-Mn-Ni-Si complex concentrated alloys (CCAs). A higher Co content decreased the phase fraction of protective corundum-type oxide as determined quantitatively. This is consistent with presented thermodynamic calculations,…
The microstructure and early-stage oxidation behavior of the equiatomic CoCrCuFeMnNi high-entropy alloy (HEA) and its six sub-alloys, obtained by omitting one element each, were investigated. Alloys were prepared using induction levitation melting, cold rolled, and oxidized for 1 h at 800°C in air. The…
In this work, attempts have been made to improve the oxidation resistance of Fe-Si alloys with 0.5, 1.0 and 2.0 mass pct Si by a preheating treatment, which was carried out at 1073 K for 24 hours in high purity hydrogen atmosphere. Compared with pure Fe and untreated Fe-Si alloys, the oxidation resistance…
The prediction of the equilibrium and metastable morphologies during the solidification of Ni-based superalloys on the mesoscopic scale can be performed using phase-field modeling. In the present paper, we apply the phase-field model to simulate the evolution of solidification microstructures depending…
Electromagnetic levitation (EML) was employed for studying the velocity and morphology of the solidification front as a function of undercooling of metallic materials. The limitation of the EML technique with respect to low melting alloys that emit outside the visible light spectrum was overcome by employing…
In this work, an attempt was made to improve the corrosion resistance of dilute Fe-Al alloys (1.0 mass% Al) by preheating treatment at 1073 K in H 2 atmosphere. In comparison with pure Fe and unpreheated Fe-Al alloys, the resistance to oxidation at 673 K in pure O 2 and to electrochemical corrosion in…
Motivated by a wide range of applications in various fields of physics and materials science, we consider a generalized approach to the evolution of a polydisperse ensemble of spherical particles in metastable media. An integrodifferential system of governing equations, consisting of a kinetic equation…
The limits of occurrence and the morphology of martensite in Cu-Zn-Al alloys with 30 to 50 wt pct Zn and ≤ 1.5 wt pct Al have been investigated. In samples with concentration gradients, various conditions for the competition between martensitic and massive transformation have been observed. Microstructural…