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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
Published on: August 15, 2018
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Anti-Aging in Ultrastable Metallic Glasses.
Martin Lüttich1,2, Valentina M Giordano3, Sylvie Le Floch3
1I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
Physical Review Letters
|April 26, 2018
Summary
Ultrastable metallic glasses (UMGs) exhibit slower atomic-level relaxation dynamics than conventional metallic glasses. Unexpectedly, annealing near the glass transition temperature accelerates UMG dynamics, a phenomenon termed anti-aging.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Amorphous Materials
Background:
- Conventional metallic glasses (MGs) suffer from inherent instability issues.
- Ultrastable metallic glasses (UMGs) offer a potential solution due to enhanced stability.
- Understanding atomic-level dynamics is crucial for UMG applications.
Purpose of the Study:
- To investigate the atomic-level stability and dynamics of UMGs.
- To compare relaxation dynamics between UMGs and conventional MGs.
- To explore the effects of annealing on UMG dynamics.
Main Methods:
- X-ray photon correlation spectroscopy (XPCS) was employed.
- Atomic-level dynamics and relaxation processes were analyzed.
- The potential energy landscape framework was utilized for interpretation.
Main Results:
- UMGs demonstrate slower relaxation dynamics at the atomic level compared to conventional MGs.
- A peculiar acceleration of dynamics, termed 'anti-aging,' was observed upon annealing near the glass transition temperature (Tg).
- Structural relaxation in all samples exhibited a compressed density fluctuation shape, independent of thermal treatments and ultrastability.
Conclusions:
- UMGs possess distinct atomic-level stability characteristics.
- The observed anti-aging phenomenon in UMGs provides new insights into amorphous material behavior.
- The universal nature of the structural relaxation process suggests a fundamental characteristic of metallic glasses.
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