|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XIX
||Thermodynamic modeling of the Cu-Mg-Si-Sn quaternary system and interpretation of Mg2(Si0.3Sn0.7)/Cu thermoelectric interconnections
||Silvana Tumminello, Sahar Ayachi, Suzana G. Fries, Eckhard Müller, Johannes de Boor
|On-Site Speaker (Planned)
The recent development on thermoelectric energy conversion shows magnesium silicide stannide solid solutions as prominent materials, owing to high values of the thermoelectric figure of merit zT, elemental abundance, and non-toxicity. The operation of thermoelectric generators, however, relies as well upon long-term stable contacts with low thermal and electrical resistivity, similar thermal expansion coefficient and good adhesion to Mg2(Si,Sn).
Mg2(Si0.3Sn0.7)/Cu joints were investigated showing good contacting and no delamination as well as low specific electrical contact resistances. Phase designation combined SEM/EDX analysis and calculated phase diagrams. To the best of our knowledge, no quaternary description is available, therefore, the aim of this work is to develop an open thermodynamic database to complement the experimental observations of thermoelectric joints and bring understanding to diffusion-reaction mechanisms in the interconnection zone (IZ). The modeling of τ1-Cu3Mg2Si and γ’-Cu51.7Mg33.3Sn15 phases are of particular interest since they are observed to grow in the IZ.
||Planned: Supplemental Proceedings volume