Thermodynamic modelling and investigation of main regularities of fusibility diagrams for ternary systems with interstitial element

In most multicomponent systems, which include real alloys eutectic transformation occupies the whole region of the concentrations and occurs in certain temperature interval. The search for eutectic alloys with maximal melting temperature and correspondingly minimal temperature interval in such systems is a very complicated and hard task. Knowledge of regularities of fusibility diagrams of such systems allows us to predict composition of eutectic alloys and to take into account influence of different factors, helping to solve such task. Establishment of such regularities was fulfilled by modelling fusibility diagram of tenary system with interstitial element

Thermodynamic modelling of phase equilibrium in Ni-Mo-C system

Modern eutectic composites, which are worked out by now, have a very complex composition. This is caused by the necessity of increasing the number and concentration of alloying elements and is accompanied by an essential change in concentration and temperature parameters of the eutectic transformation, enlarging its temperature interval and decreading directional crystallization rates. The composition region of nickel based alloys with the molybdenum carbide, which are the most favourable for directional crystallization, is situated on the tie-line of three phase equilibrium, which is passing through the point eo- Eutectic alloys γ + Mo2C belong to the type of skeleton eutectics and Mo2C carbide is the phase which leads the crystallization

Thermodynamic conditions of phase formation in Ti

In the titanium enriched part of Ti-Al diagram there were determined the temperatures of the beginning and of the end of phase transformation with the participation of liquid and solid β, α and α2 -phases. Nonmonotonous character of fusible diagram and of the curves of ordering α→α2 was established. The position of maximum at fusible diagram is determined, the most optimum for single crystal production there are the alloys, in which the composition corresponds to the maximums at the curves of L[math]β and α[math]α2 phase transformations

Real-time microstructure imaging by Laue microdiffraction: A sample application in laser 3D printed Ni-based superalloys

Synchrotron-based Laue microdiffraction has been widely applied to characterize the local crystal structure, orientation, and defects of inhomogeneous polycrystalline solids by raster scanning them under a micro/nano focused polychromatic X-ray probe. In a typical experiment, a large number of Laue diffraction patterns are collected, requiring novel data reduction and analysis approaches, especially for researchers who do not have access to fast parallel computing capabilities. In this article, a novel approach is developed by plotting the distributions of the average recorded intensity and the average filtered intensity of the Laue patterns. Visualization of the characteristic microstructural features is realized in real time during data collection. As an example, this method is applied to image key features such as microcracks, carbides, heat affected zone, and dendrites in a laser assisted 3D printed Ni-based superalloy, at a speed much faster than data collection. Such analytical approach remains valid for a wide range of crystalline solids, and therefore extends the application range of the Laue microdiffraction technique to problems where real-time decision-making during experiment is crucial (for instance time-resolved non-reversible experiments)