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Crystal nucleation and growth processes in Cu-rich glass-forming Cu-Zr alloys . J Chem Phys 2022; 157:014506. [DOI: 10.1063/5.0097023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The glass formation ability of an alloy depends on two competing processes: glass-transition on one hand, crystal nucleation and growth on the other hand. While these phenomena have been widely studied before in nearly equiatomic Cu-Zr alloys, studies are lacking for solute/solvent-rich ones. In the present work, molecular dynamics simulations show that the addition of a small amount of Zr (1-10 at. %) to Cu drastically increases incubation time and slows down crystal growth, thus leading to an improved glass forming ability. The crystal nucleation and growth processes of a competing face-centered cubic (FCC) Cu crystalline phase are analyzed in detail. In particular, the values of critical cooling rate, incubation period for crystallization and growth rate of FCC Cu crystals in these Cu-rich alloys are obtained. The growth of a supersaturated FCC Cu solid solution is found to be polymorphic at the interface (except for alloys with 9 and 10 at. % Zr) though a Zr concentration gradient is observed within growing crystals at high enough Zr content. The crystal growth rate before crystal impingement is nearly constant in all alloys, though it decreases exponentially with Zr content. Crystallization kinetics are also analyzed within the existing theories and compared with the experimental values available in the literature.
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Ryltsev R, Chtchelkatchev N. Deep machine learning potentials for multicomponent metallic melts: Development, predictability and compositional transferability. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118181] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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