Shear accelerated crystallization in a supercooled atomic liquid

Abstract

A bulk metallic glass forming alloy is subjected to shear flow in its supercooled state by compression of a short rod to produce a flat disc. The resulting material exhibits enhanced crystallization kinetics during isothermal annealing as reflected in the decrease of the crystallization time relative to the non-deformed case. The transition from quiescent to shear-accelerated crystallization is linked to strain accumulated during shear flow above a critical shear rate ${\dot{\gamma }}_c\approx 0.3$ s${}^{-1}$ which corresponds to Péclet number, $Pe\sim \mathcal{O}(1)$. The observation of shear accelerated crystallization in an atomic system at modest shear rates is uncommon. It is made possible here by the substantial viscosity of the supercooled liquid which increases strongly with temperature in the approach to the glass transition. We may therefore anticipate the encounter of non-trivial shear-related effects during thermoplastic deformation of similar systems.

7 pages, 7 figures. To appear in Phys. Rev. E

References in corpus (6)

• Theory of activated-rate processes under shear with application to shear-induced aggregation of colloids
• Crystal Nucleation of Colloidal Suspensions under Shear
• Extension of Classical Nucleation Theory for Uniformly Sheared Systems
• Shear Induced Structural Ordering of a Model Metallic Glass
• Crystal nucleation and cluster-growth kinetics in a model glass under shear
• Crystallization of amorphous silicon induced by mechanical shear deformations

Cited by in corpus (7)

• Effects of shear flow on phase nucleation and crystallization
• The role of shear in crystallization kinetics: From suppression to enhancement
• Classical Nucleation Theory for the Crystallization Kinetics in Sheared Liquids
• Universal Nucleation Behaviour of Sheared Systems
• Crystal Growth in Fluid Flow: Nonlinear Response Effects
• Homogeneous Nucleation of Sheared Liquids: Advances and Insights from Simulations and Theory
• Morphology of Critically-Sized Crystalline Nuclei at Shear-Induced Crystal Nucleation in Amorphous Solid