Bell-shaped “dendrite velocity-undercooling” relationship with an abrupt drop of solidification kinetics in glass forming Cu-Zr(-Ni) melts

•Dendrite growth kinetics is analyzed experimentally and theoretically.•Crystallization kinetics strongly depends on the atomic structure of the melt.•An abrupt drop in dendrite velocity occurs due to atomic clusters creating dense networks. We analyze the crystal growth kinetics of rapidly solidify...

Full description

Saved in:
Bibliographic Details
Published in:Journal of crystal growth 2020-02, Vol.532, p.125411, Article 125411
Main Authors: Galenko, Peter K., Wonneberger, Robert, Koch, Stefanie, Ankudinov, Vladimir, Kharanzhevskiy, Evgeny V., Rettenmayr, Markus
Format: Article
Language:English
Subjects:
Amorphous phase (E)
Computer simulation
Copper
Copper base alloys
Crystal growth
Crystallization
Dendrite (B)
Dendritic structure
Gibbs free energy
Glass formation
Growth velocity (C)
Kinetics
Melts (crystal growth)
Nickel
Solidification
Solidification (A)
Supercooling
Undercooling (D)
Zirconium base alloys
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Dendrite growth kinetics is analyzed experimentally and theoretically.•Crystallization kinetics strongly depends on the atomic structure of the melt.•An abrupt drop in dendrite velocity occurs due to atomic clusters creating dense networks. We analyze the crystal growth kinetics of rapidly solidifying glass-forming Cu50Zr50 alloy melts. Formulating a dendrite growth model we predict all features of crystallization kinetics in Cu50Zr50 from thermodynamically controlled growth (governed by the change in Gibbs free energy on solidification) to the kinetically limited regime (governed by atomic attachment at the solid/liquid interface). Comparing critical undercoolings observed in the crystallization kinetics with experimental data on melt viscosity, atomistic simulation's data on liquid microstructure and theoretically predicted dendrite growth velocity allows us to conclude that the dendrite growth kinetics strongly depends on the cluster structure changes of the melt.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2019.125411