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Updated: Aug 10, 2025
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
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Can Severe Plastic Deformation Tune Nanocrystallization in Fe-Based Metallic Glasses?
Monika Antoni1,2, Florian Spieckermann2, Niklas Plutta2
1Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, 8700 Leoben, Austria.
Materials (Basel, Switzerland)
|February 11, 2023
Summary
Severe plastic deformation via high-pressure torsion (HPT) impacts iron-based metallic glasses differently. One alloy showed extended processing ranges, while another achieved crack-minimized consolidation and deformation, revealing distinct HPT-induced crystallization behaviors.
Area of Science:
- Materials Science
- Metallurgy
- Solid Mechanics
Background:
- Metallic glasses offer unique properties but are limited by processing.
- Severe plastic deformation (SPD) techniques like high-pressure torsion (HPT) can modify material structures.
- Iron-based metallic glasses are candidates for advanced applications.
Purpose of the Study:
- To investigate and compare the effects of HPT on two distinct iron-based metallic glasses.
- To explore the consolidation and deformation limits of these alloys under HPT.
- To understand HPT-induced structural changes, including crystallization.
Main Methods:
- High-pressure torsion (HPT) for severe plastic deformation.
- X-ray diffraction (XRD) for structural analysis.
- Dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC) for thermal properties.
- Optical microscopy and transmission electron microscopy (TEM) for microstructural examination.
Main Results:
- HPT processing extended the consolidation and deformation ranges for Fe73.9Cu1Nb3Si15.5B6.6.
- HPT processing achieved crack-minimized consolidation and deformation for Fe81.2Co4Si0.5B9.5P4Cu0.8, a first.
- Fe81.2Co4Si0.5B9.5P4Cu0.8 exhibited HPT-induced crystallization, unlike Fe73.9Cu1Nb3Si15.5B6.6.
Conclusions:
- The two iron-based metallic glasses respond differently to HPT due to variations in deformation energy and resulting crystalline phases.
- HPT can induce crystallization in specific metallic glasses, offering a pathway to modified properties.
- These findings suggest potential for enhancing magnetic properties of glassy alloys without thermal treatment.
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