Abstract
An alternative route to obtain bulk metallic glasses is by consolidation of metallic glass powders by deforming these materials in the temperature interval between the crystallization temperature and the glass transition temperature, where the material flows with a reduced viscosity. In the present work, bulk parts of the Fe43.2Co28.8B19.2Si4.8Nb4 alloy were produced by hot-pressing gas-atomized powders (GAP) under different uniaxial pressures. Different microstructural analysis revealed that the initial powder as well as the consolidated parts were mostly amorphous, with similar transformation temperatures, showing that bulk samples of this alloy can be produced by conformation in the supercooled liquid region. The sample conformed under the highest pressure (1GPa) exhibited the highest relative density of 96.1±0.5%. These results show that hot pressing of Fe-based gas-atomized powders is a promising route for producing Fe-based bulk metallic glasses.
Highlights
Metallic glasses are a relatively new class of materials characterized by the absence of long-range ordering 1,2
Bulk parts of the Fe43.2Co28.8B19.2Si4.8Nb4 alloy were produced by hot-pressing gas-atomized powders (GAP) at a temperature within their supercooled liquid interval
The ingot chemical analysis was performed by inductively coupled plasma optical emission spectrometry (ICP-OES), using a spectrometer Varian model Vista
Summary
Metallic glasses are a relatively new class of materials characterized by the absence of long-range ordering 1,2 Due to their unique atomic structure, many unusual properties are observed in these alloys, such as high mechanical strength, soft magnetic properties and good wear and corrosion resistance 5, among others. Iron-based metallic glasses often have complex compositions and usually exhibit poor glass forming ability (GFA) compared to other non-ferrous metallic glasses 6. These alloys have attracted considerable attention due to their low cost, high availability, good soft magnetic properties and high mechanical strengths 7,8. Among the iron-based alloys, the composition Fe43.2Co28.8B19.2Si4.8Nb4 shows a relatively high GFA, being able to produce amorphous samples of up to 4 mm by copper mold casting 9. It has a compressive yield strength above 4000 MPa, making it a promising candidate for applications in micro-engineering components
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