Ultrafast growth kinetics of titanium dendrites investigated by electrostatic levitation experiments and molecular dynamics simulations

L Wang and L Hu and JF Zhao and B Wei, CHEMICAL PHYSICS LETTERS, 742, 137141 (2020).

DOI: 10.1016/j.cplett.2020.137141

An ultrafast crystal growth velocity of 122 m/s for beta-Ti dendrites was achieved at a liquid undercooling of 352 K (0.18T(m)) by electrostatic levitation technique. In contrast, most refractory metals attained slower dendrite growth velocities but displayed similar power laws with liquid undercooling. A combined analysis by current dendrite growth theory with molecular dynamics simulation indicates that liquid thermal diffusion rather than solid-liquid (S/L) interface kinetics is still the dominant factor to control dendrite growth. Besides, the atomic-scale thickness of the S/L interface layer may determine the dendrite growth velocity difference for various refractory metals.

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