biostudies-literatureHou LEuropean Research Council14862https://www.ebi.ac.uk/biostudies/studies/S-EPMC6795889biostudies-literatureUnknown9(1)This paper reports on 3D phase field simulations of IMC growth in Co/Sn and Cu/Sn solder systems. In agreement with experimental micrographs, we obtain uniform growth of the CoSn₃ phase in Co/Sn solder joints and a non-uniform wavy morphology for the Cu₆Sn₅ phase in Cu/Sn solder joints. Furthermore, simulations were performed to obtain an insight in the impact of Sn grain size, grain boundary versus bulk diffusion, IMC/Sn interface mobility and Sn grain boundary mobility on IMC morphology and growth kinetics. It is found that grain boundary diffusion in the IMC or Sn phase have a limited impact on the IMC evolution. A wavy IMC morphology is obtained in the simulations when the grain boundary mobility in the Sn phase is relatively large compared to the interScientific reportsStudy of the effect of Sn grain boundaries on IMC morphology in solid state inter-diffusion soldering.PMC6795889n° 714754Hou LBeyne EMoelans NDerakhshandeh JDe Wolf IfalseStudy of the effect of Sn grain boundaries on IMC morphology in solid state inter-diffusion soldering.This paper reports on 3D phase field simulations of IMC growth in Co/Sn and Cu/Sn solder systems. In agreement with experimental micrographs, we obtain uniform growth of the CoSn₃ phase in Co/Sn solder joints and a non-uniform wavy morphology for the Cu₆Sn₅ phase in Cu/Sn solder joints. Furthermore, simulations were performed to obtain an insight in the impact of Sn grain size, grain boundary versus bulk diffusion, IMC/Sn interface mobility and Sn grain boundary mobility on IMC morphology and growth kinetics. It is found that grain boundary diffusion in the IMC or Sn phase have a limited impact on the IMC evolution. A wavy IMC morphology is obtained in the simulations when the grain boundary mobility in the Sn phase is relatively large compared to the inter2019-01-01T00:00:00Z2019 Oct2025-04-26T16:42:50.374Z2019-11-05T08:06:53ZS-EPMC67958893161971010.1038/s41598-019-51179-9