METALLURGY

Metallic Melts & Joining

Metals are generally considered as solid materials, but they are at liquid state in several processes and applications such as brazing, soldering, welding, casting, crystal growth, MMC fabrication by infiltration, liquid phase sintering, etc.

In ICMATE, in order to increase the performance and to optimize process fabrications, the behaviour of several metallic systems are studied at solid and liquid state.

ACTIVITIES:

Studies of wettability of molten metals and design of metal-ceramic interfaces for high temperature applications.
Joining of materials by liquid-based processes; design and testing of brazing and soldering alloys
Liquid metal-ceramic interactions in casting processes; identification of suitable mould materials for foundry industries
Metal phases for enhancing CMC joining and densification.
Multicomponent alloys and steels as structural materials.
Thermodynamic modeling of metal-ceramic interfaces by CALPHAD
Coating based on metal systems
Solidification processes for metallic glasses and high entropy alloys
Laser welding / laser cutting of metallic alloys: study of processability, microstructural evolution and mechanical behaviour

LASER WELDING / LASER CUTTING OF METALLIC ALLOYS

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SOLDERING ALLOYS

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BRAZING ALLOYS FOR DISSIMILAR MATERIALS FOR IMPROVING JOINING PROCESS BETWEEN CERAMICS AND METALS

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METAL PHASES FOR ENANCHING CMC JOINING AND DENSIFICATION

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SUITABLE MOULD MATERIALS FOR FOUNDRY INDUSTRIES

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MULTICOMPONENT ALLOYS AND STEELS AS STRUCTURAL MATERIALS

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COATING BASED ON METAL SYSTEMS

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SOLIDIFICATION PROCESSES FOR METALLIC GLASSES AND HIGH ENTROPY ALLOYS

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THERMODYNAMIC MODELING OF METAL-CERAMIC INTERFACES BY CALPHAD

Since industrial material processes often involve complex chemical reactions not yet studied, thermodynamic software that can predict phase equilibria in complex multicomponent systems is a very practical tool in the optimization of material processes. At ICMATE, the thermodynamic optimization (modeling) based on the CALPHAD method is widely used in order to obtain self-consistent sets of model equations for the Gibbs energies which best reproduce the data for all phases as functions of temperature and composition providing good estimates for unexplored phase diagram and thermodynamic properties in low-order or high-order systems. Thermodynamic simulation is also exploited to predict and interpret metal-ceramic reactivity in complex multielement systems.

ACTIVITIES:

· Prediction and comparison thermodynamic and thermophysical properties of metal systems (alloys).

· Assessment of thermodynamic databases including metallic and ceramic elements, oxides, etc.

· Thermodynamic prediction and interpretation of liquid-solid interactions and interface evolution at high temperatures: phase diagrams, cooling plots, phase equilibria, Scheil-Gulliver plots.

· Thermodynamic prediction and interpretation of liquid-solid interactions at high temperatures between similar and dissimilar materials: phase diagrams, cooling plots, phase equilibria.

Relevant publications:

S Gambaro, L Fenocchio, F Valenza, P Riani, G Cacciamani. Combined experimental and CALPHAD investigation of equimolar AlCoCrFeNiX (X=Mo,Ta,W) High-Entropy Alloys. Calphad 85 (2024) 102702 (ISSN 0364-5916). https://doi.org/10.1016/j.calphad.2024.102702
S Gambaro, F Valenza, L Fenocchio, G Cacciamani. Liquid AlCoCrFeNi and AlCoCrFeNiX (X = Mo, Ta) high-entropy alloys on graphite: Wetting and Reactivity evaluation supported by CALPHAD method. Surfaces and Inter 54 (2024) 105207 ISSN 2468-0230. https://doi.org/10.1016/j.surfin.2024.105207
L Fenocchio, A Saviot, S Gambaro, F Valenza, S Le Gallet, MR Ardigo-Besnard, G Cacciamani CALPHAD-aided synthesis and characterization an Al-Co-Cr-Fe-Ni-W HEA prepared by Arc Melting and Spark Plasma Sintering. Journal of Materials Research and Technology 34 (2024) 1252-1264. https://doi.org/10.1016/j.jmrt.2024.12.140

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