Thermodynamic and Kinetic Simulations on Joining and Additive Manufacturing Processes for an ICME Framework

Thermodynamic and Kinetic Simulations on Joining and Additive Manufacturing Processes for an ICME Framework

A particular application of joining technologies is the development of contacts for high-performance thermoelectric generators. With focus on non-toxic Mg2(Si,Sn)-based thermoelectrics, the manufacturing challenge points to the contact between dissimilar materials, of semiconducting and metallic type. Typically achieved using several contacting layers, e.g. solder fillers, diffusion barriers, which produce bonding layers by diffusion-reaction in the interconnection zone (IZ). The multiphase/multilayered bonded region has intrinsic dissimilar physico-chemical properties; therefore, the IZ is susceptible to degradation and/or failure during long-term operation under a thermal gradient.

A CALPHAD-based ICME approach fits wonderfully to analyze and optimize that configuration. It is shown that the Thermo-Calc and TC-Python framework can be used to simulate the diffusion-reaction phenomena at the IZ to identify expected bonding layers, thickness and morphology. Additionally, a similar approach including the Precipitation Module (TC-PRISMA) and the Diffusion Module (DICTRA) is used to investigate the precipitation kinetics underlying the complex microstructure observed in Ti2AlNb-based alloys produced by additive manufacturing processes.

This webinar is part of our Expert User Series, which invites experts from industry and academia to present their work with Thermo-Calc products.

Dr. Silvana Tumminello, Postdoctoral Researcher, German Aerospace Center (DLR)

Therese Gustafsson, Technical Sales Manager, Thermo-Calc Software

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About the Speaker


Dr. Silvana Tumminello
Postdoctoral Researcher
German Aerospace Center (DLR)

Dr. Silvana Tumminello

Silvana Tumminello got her doctorate degree on thermodynamics and kinetics of multilayer systems for application in Ni-based superalloys and lead-free solders, in UNSAM (Universidad Nacional de San Martin) Buenos Aires, Argentina. During this time, she developed her expertise on experimental and computational thermodynamics.

Since 2019 she continues working on multilayered material systems at the Institute of Materials Research of the German Aerospace Center (DLR) in Cologne, Germany. Establishing synergies among departments she focuses on the ICME method to develop solutions on joining processes for thermoelectric generators and on rapid alloy development using the Thermo-Calc Software Package.

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