Rapid dendrite growth subjected to multi-solute trapping in an undercooled Fe-based quaternary alloy

The influence of multi-solute trapping on dendrite growth remains unclear yet. In this paper, rapid solidification of Fe-5Ni-5Mo-5Ge (wt.%) alloy was accomplished to investigate (αFe) dendrite growth involving three solutes. The dendrite growth velocity increases sluggishly and then rapidly with the rise of undercooling. Compared with Ni and Mo solutes, Ge solute plays the dominant role on the sluggish dendrite growth within a wide moderate undercooling range. All the solutes promote the rapid dendrite growth at a higher undercooling. The segregationless dendrite growth was achieved due to multi-solute trapping effect at the maximum experimental undercooling.

► Rapid dendrite growth involving three solutes was investigated in an undercooled Fe-5Ni-5Mo-5Ge (wt.%) alloy.
► The dendrite growth velocity increases exponentially with the rise of undercooling.
► Ge solute is the key factor for the sluggish dendrite growth at a lower undercooling.
► The segregationless dendrite growth was achieved due to multi-solute trapping effect.