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Soft Ferromagnetic Bulk Metallic Glass with Potential Self-Healing Ability
Parthiban Ramasamy1, Mihai Stoica2, Gabriel Ababei3
1Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, Leoben A-8700, Austria.
Materials (Basel, Switzerland)
|March 19, 2020
Summary
Researchers developed a novel soft ferromagnetic bulk metallic glass (BMG) with self-healing capabilities. Adding gallium to iron-cobalt-based BMGs enhances mechanical properties through localized melting during deformation.
Area of Science:
- Materials Science
- Metallurgy
- Solid-state Physics
Background:
- Soft ferromagnetic bulk metallic glasses (BMGs) are attractive for magnetic applications.
- Developing BMGs with enhanced mechanical properties, such as self-healing, remains a challenge.
Purpose of the Study:
- To propose and investigate a new concept of soft ferromagnetic BMGs with self-healing ability.
- To explore the effect of gallium (Ga) content on the properties of [Fe36Co36B19.2Si4.8Nb4]100-x(Ga)x BMGs.
Main Methods:
- Synthesis of BMGs with varying Ga content (x = 0, 0.5, 1, 1.5) using copper mold casting.
- Characterization of soft magnetic properties and mechanical behavior (compressive strain).
- Microscopic analysis of fracture surfaces to observe localized melting phenomena.
Main Results:
- Ga-containing BMGs retained soft magnetic properties.
- A large plastic strain of 1.53% in compression was achieved.
- Localized melting was observed during shearing, forming molten droplets on the fracture surface.
Conclusions:
- The concept of utilizing local melting during shearing enables self-healing in soft ferromagnetic BMGs.
- Molten regions effectively deflect shear transformation zones, leading to improved mechanical properties.
- This approach offers a pathway to design advanced BMGs with combined magnetic and self-healing functionalities.
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