Abstract
Due to their outstanding mechanical properties and soft magnetic characteristics, cobalt-based metallic glassy alloys have stimulated much interesting research. These metastable ferromagnetic materials possess very small magnetocrystalline anisotropy, and almost zero magnetostriction. They reveal low coercivity, extremely low core loss, moderate saturation polarization, and very high magnetism. Despite these attractive physical behaviors, Co-based metallic glasses are difficult to obtain by the melting/casting and conventional rapid solidification techniques due to their poor glass-forming ability. In the present study, we succeed in preparing (Co75Ti25)100−xFex (x; 0–20 at.%) metallic glassy powders, using a mechanical alloying approach. The end product of the as-prepared powders was consolidated into full dense cylinders with large-diameter and thickness (2 × 2 cm), using spark plasma sintering technique. The results have shown that the consolidation step did not lead to any undesired crystallizations or phase transformations, and the as-consolidated buttons maintained their unique short-range order structure. These bulk metallic glassy systems possessed high glass-transition and crystallization temperatures, suggesting their high thermal stability. However, they showed low values of the reduced glass-transition temperatures, indicating that this system is difficult to prepare by the conventional way of preparations.
Highlights
IntroductionMetallic glassy alloys date to 1960, when Duwez and his group discovered the possibility of preparing Au80Si20 metallic glass, using a rapid quenching technique [4]
This study aims to prepare bulk metallic glasses (BMG)-(Co75Ti25)100−xFex ternary systems upon consolidation of the BM powders into full dense bulk material, using spark plasma sintering (SPS) technique
After 60 h of mechanical alloying (MA) time, all the Bragg peaks corresponding to pure Co and Ti elements disappeared, where the halo-peak had become pronounced, indicating the compilation of MA process and formation of an amorphous structure phase (Figure 1c)
Summary
Metallic glassy alloys date to 1960, when Duwez and his group discovered the possibility of preparing Au80Si20 metallic glass, using a rapid quenching technique [4]. Due to their exciting unique properties, bulk metallic glasses (BMG) have attracted many metallurgists and materials scientists to investigate an uncounted number of metallic glassy systems over the last 6 decades. All work related to the preparations, characterizations, and implementations of metallic glassy alloys has discovered advanced properties of this category of materials that are not found when the same alloys are in their stable crystalline states [13]. Metallic glasses are considered to be promising candidates for several technical applications in engineering, electronics, medical, defense and aerospace industries, and sports sectors [15,21,22,23,24,25,26,27,28]
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