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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Shear-accelerated crystallization in a supercooled atomic liquid.

Zhen Shao1,2, Jonathan P Singer1,2, Yanhui Liu2,3

  • 1Department of Chemical and Environmental Engineering, Yale University, New Haven Connecticut 06511, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 14, 2015
PubMed
Summary
This summary is machine-generated.

Shear flow in supercooled metallic glasses significantly accelerates crystallization kinetics. This effect, observed above a critical shear rate, offers new insights into material processing and behavior.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Rheology

Background:

  • Bulk metallic glasses (BMGs) are amorphous alloys with unique properties.
  • Understanding their behavior in the supercooled liquid state is crucial for applications.
  • Crystallization kinetics in BMGs can be influenced by external stimuli.

Purpose of the Study:

  • To investigate the effect of shear flow on the crystallization kinetics of a bulk metallic glass.
  • To determine the critical shear rate at which shear-induced crystallization is enhanced.
  • To correlate shear-accelerated crystallization with material properties like viscosity.

Main Methods:

  • Subjecting a bulk metallic glass forming alloy to shear flow in its supercooled state via compression.
  • Isothermally annealing the deformed and undeformed samples.
  • Measuring and comparing crystallization times to assess kinetics.

Main Results:

  • Shear flow in the supercooled state enhances crystallization kinetics.
  • Crystallization time decreased significantly in the deformed sample compared to the undeformed one.
  • Shear-accelerated crystallization was observed above a critical shear rate (γ̇(c)≈0.3 s(-1)), corresponding to a Péclet number (Pe) of O(1).

Conclusions:

  • Modest shear rates can accelerate crystallization in supercooled metallic glasses, which is uncommon.
  • The high viscosity of the supercooled liquid, increasing with temperature, facilitates this shear effect.
  • Nontrivial shear-related effects are anticipated during thermoplastic deformation of similar systems.