Effect of non-linear liquidus and solidus in undercooled dendrite growth: A comparative study in Ni-0.7 at.% B and Ni-1 at.% Zr systems

A steady-state dendrite growth model proposed for binary alloys, which assumes non-linear liquidus and solidus, was used to compare dendrite growth in undercooled Ni-0.7 at.% B and Ni-1 at.% Zr alloys. In comparison with Ni-0.7 at.% B alloy, the effect of non-linear liquidus and solidus is strengthened in Ni-1 at.% Zr alloy, so that non-linear growth occurs at the so-called linear stage at high undercooling.