Numerical investigation of intermetallic compounds’ evolution during solid-state joining of dissimilar materials via two multiphase-field approaches
With the prospect of joining dissimilar materials via solid-state processes to obtain the synergy of desirable properties of the materials being joined, arises the issue of formation of intermetallic compounds at the joint interface, which may determine the mechanical properties of the joint [Liu et al. (2014)]. Understanding the driving mechanisms and evolution of these intermetallic compounds in solid-state joining processes is crucial in the pursuit of controlling the joint strength. Refill Friction Stir Spot Welding is an example of a solid-state process where the driving mechanisms of intermetallic compounds are temperature and severe plastic deformation [Suhuddin et al. (2014)]. To this end, we employ two multiphase-field models - one based on grand-potential functional [Choudhury and Nestler (2012)] and the other on free-energy functional [Steinbach et al. (1996)] - as numerical tools to investigate the evolution of the intermetallic compounds. The multi-phase field approaches yield two microstructural simulation sets depicting the evolution of the intermetallic compounds which are then compared and evaluated.
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