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Metallic Glacial Glass Formation by a First-Order Liquid-Liquid Transition.

J Shen1,2, Z Lu3, J Q Wang2,4

  • 1Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

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|July 11, 2020
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Summary
This summary is machine-generated.

Researchers created metallic glacial glass (MGG) from a supercooled liquid using a first-order phase transition. This discovery offers new insights into liquid-liquid transitions in metallic glass-forming liquids.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Supercooled liquids can form a glacial phase via first-order transitions.
  • Metallic glasses are amorphous solids with unique properties.
  • Understanding phase transitions in glass-forming liquids is crucial for materials development.

Purpose of the Study:

  • To report the formation of metallic glacial glass (MGG) from a metallic glass precursor.
  • To investigate the characteristics and phase transition of MGG.
  • To explore the liquid-liquid transition scenario in metallic glass-forming liquids.

Main Methods:

  • Utilizing a rare-earth-element-based metallic glass precursor.
  • Inducing a first-order phase transition in the supercooled liquid state.
  • Fabricating bulk MGG samples with a critical diameter exceeding 3 mm.
  • Employing fast differential scanning calorimetry to observe transitions.
  • Analyzing kinetics using a continuous heating transformation diagram.

Main Results:

  • Successfully formed metallic glacial glass (MGG) through a first-order phase transition.
  • MGG exhibits distinct enthalpy, structure, and property changes compared to metallic glass.
  • Observed a reversed "melting-like" transition from MGG to its supercooled liquid.
  • Demonstrated excellent glass-forming ability of the precursor for bulk MGG fabrication.
  • Kinetics of MGG formation characterized via continuous heating transformation diagrams.

Conclusions:

  • The formation of MGG supports the liquid-liquid transition scenario in metallic glass-forming liquids.
  • MGG represents a novel glassy state with unique thermodynamic and structural properties.
  • This research opens new avenues for designing and fabricating advanced metallic materials.