Abstract
In this paper, we report two cases studies where solidification processes were successfully investigated with CALPHAD-based methodologies. The first one refers to the use of thermodynamic databases to describe the solidification processes of a precious Au-base alloy containing Ir as a grain refiner. The second one concerns the development and use of a quaternary database for Al-Mg-Si-Er alloys for additive manufacturing, where Er is added as a nucleating agent. While in the former case, the solidification process was investigated by running the Thermo-Calc software with a specific TCNOBL1 commercial database, in the latter, the necessary database was first constructed, using available thermodynamic assessments in the literature and experimental data, and then applied to investigate the solidification behavior of selected alloys.
Highlights
In this paper, we report two cases studies where solidification processes were successfully investigated with CALPHAD-based methodologies
We present two case studies where CALPHAD-based calculations were applied to obtain the thermodynamic properties of two different types of materials: (a) an
Calculations were performed considering both the presence and absence of the L10_FCC ordered solid solution. This is stable in the phase diagram, but it is usually not found in real products, due to the fast-quenching process
Summary
Computational methods and software have proved very useful in reducing the need for experimental trial and error in materials design and process optimization [1]. Based on the CALPHAD method, thermodynamic databases can be constructed and used to compute various properties for a variety of different types of materials (Ni-base superalloys, steels, high entropy alloys, etc.). We present two case studies where CALPHAD-based calculations were applied to obtain the thermodynamic properties of two different types of materials: (a) an. Controlling grain growth during annealing is a crucial point of the process and can be achieved by adding small amounts of some metals with high melting points and low solubility in gold. This is the case of iridium, ruthenium, or. Afterwards, calculations of equilibrium and non-equilibrium solidification and other thermodynamic properties relevant for AM processes were carried out
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