Abstract
During the directional solidification of ternary eutectic alloys, different arrangements of the three solid phases evolve, leading to multiple microstructure patterns. These patterns influence the macroscopic properties of the alloy. Different arrangements are even found in single micrographs for the same imposed process conditions. Gaining a better understanding of the complex mechanisms leading to these different patterns is crucial to obtain tailored microstructures with specific properties. To exploit the different patterns which appear in ternary eutectic Al-Ag-Cu, a coupled approach is undertaken using a large-scale simulation and extensive parameter studies on smaller 3D domains. Three patterns found in both large-scale simulations as well as experimental micrographs are investigated with smaller domain size simulations by systematically varying the lamellar spacings. The resulting undercooling-spacing correlations of all investigated phase arrangements follow a Jackson-Hunt-type shape. Different stability ranges of the initially set microstructure are found, and depending on the lamellar spacings, the pattern with the lowest undercooling changes. The combination of both outcomes gives an explanation for the presence of different patterns within single micrographs of directionally solidified ternary eutectic alloys.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
