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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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Dynamic singularity in multicomponent glass-forming metallic liquids.

S M Chathoth¹, B Damaschke, M M Koza

¹I. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany. schatho@gwdg.de

Physical Review Letters

|September 4, 2008

Summary

Researchers found that highly concentrated metallic liquids, like nickel-niobium alloys, reach a critical packing fraction. This critical point significantly slows down atomic movement, aligning with theoretical predictions for glass-forming materials.

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Area of Science:

Materials Science
Condensed Matter Physics
Physical Chemistry

Background:

Glass-forming metallic alloys exhibit unique liquid-state properties.
High packing fractions in liquids are associated with altered dynamics.

Purpose of the Study:

To investigate the relationship between packing fraction and microscopic dynamics in metallic liquids.
To experimentally determine the critical packing fraction in glass-forming metallic systems.

Main Methods:

Quasielastic neutron scattering (QNS) was employed to measure self-correlation functions.
Analysis of incoherent neutron scattering data to extract dynamic properties.
Studied glass-forming alloys Ni59.5Nb40.5 and Ni60Nb34.8Sn5.2 in their liquid state.

Main Results:

Observed extraordinarily high packing fractions in liquid Ni-Nb alloys.
Demonstrated a significant slowing down of microscopic dynamics with increasing packing fraction.
Measured a decrease in self-diffusivity by two orders of magnitude over a 360 K range in liquid Ni60Nb34.8Sn5.2.
Experimentally determined critical packing fraction agrees well with mode-coupling theory predictions.

Conclusions:

The study provides the first experimental evidence of a critical packing fraction in metallic liquids.
This critical packing fraction marks a transition point where dynamics dramatically slow down.
Results validate theoretical predictions of mode-coupling theory for glass-forming metallic systems.