Local Atomic Structures of Amorphous Fe<SUB>80</SUB>B<SUB>20</SUB> and Fe<SUB>70</SUB>Nb<SUB>10</SUB>B<SUB>20</SUB> Alloys Studied by Electron Diffraction

Abstract

Effect of Nb addition on the stabilization of amorphous Fe 80 B 20 alloy was studied by electron diffraction structure analysis with the help of computer simulation. Atomic structure models with dense-random-packing 5000 atoms were constructed to reproduce interference functions obtained experimentally for the amorphous Fe 80 B 20 and Fe 70 Nb 10 B 20 alloys. In the structure models so obtained, prism-type local atomic arrangements dominated around B atoms in both the alloys, while deformed-bcc and icosahedral-like clusters were frequently found around Fe atoms. The icosahedral-like clusters and short Fe-Fe bondings were more frequently found in Fe 70 Nb 10 B 20 . The difference of glass forming abilities of these alloys is discussed in relation to the local structural differences.

Characterization of atomic-level structure in Fe-based amorphous and nanocrystalline alloy by experimental and modeling methods

“…Peak values of Fe-Fe, Fe-B and Fe-Nb partial PDFs are found at 0.252, 0.202, and 0.265 nm, respectively. It should be noted that the similar distances of Fe-Fe, Fe-B and Fe-Nb atomic pairs are reported by Hirata et al [30] for the same chemical composition. Also, Hirotsu et al [12] presented the RMC-PDF fittings to the experimental PDFs for the Fe 70 Nb 10 B 20 glassy sample basing on the results of electron diffraction technique.…”

Structure Analyses of Fe-based Metallic Glasses by Electron Diffraction

“…We then moved our subjects to ternary Fe-B-Nb alloys in order to clarify a difference in local atomic structures of metallic glasses with various glass stabilities [14]. We focused especially on ternary Fe 84 Nb 7 B 9 and Fe 70 Nb 10 B 20 glass structures [15,16], with a structural reference of Fe 80 B 20 . The Fe 70 Nb 10 B 20 glass has a high glass forming ability, showing a large supercooled liquid region.…”

Medium-Range Order in High Al-content Amorphous Alloys Measured by Fluctuation Electron Microscopy

“…to describe the medium-range structure. Reverse Monte Carlo simulations [61][62][63] on high Alcontent amorphous alloys using V along with other constraints (structure factor, coordination…”