Related Experiment Video
Updated: Jan 14, 2026
08:55
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
8.9K
Extra Phase Dynamics Hidden under Dynamics Relaxation Spectra of Amorphous Alloys
Yao Huang1,2, Rui Zhao1, Suting Weng1,2
1Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
The Journal of Physical Chemistry Letters
|October 25, 2025
Summary
Extra amorphous phases form during relaxation in alloys, affecting mechanical properties. Dynamics heterogeneity correlates with these phases, requiring new models for amorphous alloy relaxation.
Area of Science:
- Materials Science
- Condensed Matter Physics
Background:
- Dynamic relaxation is crucial for amorphous alloys, influencing mechanical and glass transition behaviors.
- Understanding relaxation dynamics, especially with extra phase formation, is incomplete.
Purpose of the Study:
- To investigate the influence of extra phase formation on relaxation dynamics in amorphous alloys.
- To explore the relationship between dynamics heterogeneity and the formation/percolation of extra phases.
Main Methods:
- Dynamic mechanical analysis
- Electron microscopy
- Characterization of dynamics heterogeneity using the stretched exponent βKWW
Main Results:
- Extra multiple amorphous phases emerged during relaxation in a model CrFeCoNiZr alloy.
- A premature decrease in storage modulus was observed, deviating from typical glass transition behavior.
- Dynamics heterogeneity (βKWW) correlated with extra phase formation and percolation.
Conclusions:
- Extra phase formation significantly impacts relaxation dynamics in amorphous alloys.
- Dynamics heterogeneity is linked to the microstructural evolution during relaxation.
- Future models must incorporate extra phase formation and percolation for accurate relaxation dynamics prediction.
Related Concept Videos
02:39Phase Transitions: Melting and Freezing
14.6K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
14.6K
02:31Phase Transitions
22.3K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
22.3K
02:33Phase Transitions: Sublimation and Deposition
19.6K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
19.6K
01:28Atomic Nuclei: Types of Nuclear Relaxation
906
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
906
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.5K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.5K
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
1.7K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
1.7K