Abstract
Iron-boron based bulk metallic glasses (BMG) development has been initiated using Fe40Ni38Mo4B18 as precursor. Addition of zirconium up to 10 atomic % along with the reduction of Ni proportion improves the glass forming ability (GFA), which is optimum when Ni is suppressed in the alloy. However melting instability occurred during the materials fabrication resulting in the formation of residual crystalline phases closely related to the amorphous phase. Microstructure study shows an evolution from amorphous structure to peculiar acicular structure, particularly for Fe50Ni16Mo6B18Zr10, suggesting the amorphous structure as interconnected atomic sheets like “atomic mille feuilles” whose growth affects the alloys’ GFA.
Highlights
Bulk metallic glasses still have promising applications owing to their remarkable properties [1], the size limitations have not been overcome
It is crystalline with a major eutectic structure containing white contrast precipitates and dendrites. These latter are formed on linear paths that are probably linked to the turbulent movement of the melt during the casting (Figure 2a)
We have investigated the iron-boron based bulk metallic glasses (BMG) development from precursor Fe40Ni38Mo4B18 alloy
Summary
Bulk metallic glasses still have promising applications owing to their remarkable properties [1], the size limitations have not been overcome. Metals 2013, 3 description, which can only improve our understanding of the atomic arrangement in the BMGs. microstructural patterns, morphologies must be explained referring to known features in materials science but from other scientific areas, like at the eve of physical metallurgy, for instance, where the peculiar microstructure of martensite was established [4]. As in that earlier study [5], we have initiated the development of Fe-B-based BMG choosing Zr as additional element to enhance the glass forming ability GFA [3] of an initial Fe40Ni38Mo4B18 alloy This latter is commercially known as Metglas 2605 MB, yields good ribbons, crystallizes primarily in metastable cubic FexNi23 − x(Mo)B6 [6,7], a melt stability criterion according to Jones [8], that directs its choice as precursor material for development of BMG. Since our description is uncommon, careful attention should be paid to the microstructure as we have done ourselves
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