Development of Fe-B Based Bulk Metallic Glasses: Morphology of Residual Phases in Fe50Ni16Mo6B18Zr10 Glass

Abstract

Iron-boron based bulk metallic glasses (BMG) development has been initiated using Fe 40 Ni 38 Mo 4 B 18 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 Fe 50 Ni 16 Mo 6 B 18 Zr 10 , suggesting the amorphous structure as interconnected atomic sheets like "atomic mille feuilles" whose growth affects the alloys' GFA.

Diffraction patterning using back scattering of electrons in Zr47.5Cu45.5Al5Co2 Bulk Metallic Glass Matrix Composites

“…It can not only generate diffraction patterns (kikuchi lines) [96] but can efficiently map the presence of different phases (of distinct crystal structure) [82] in a bulk of material [97] and compare them with existing crystal structures in international crystallographic diffraction database. With the augmentation of energy dispersive X-ray spectroscopy (EDS) detector, it can also generate elemental maps which can serve as input for back scatter diffraction data collection [94,98]. It also generates pole figures and grain size histograms which again can be used to determine mechanical properties of material.…”

Diffraction patterning using back scattering of electrons in Zr47.5Cu45.5Al5Co2 Bulk Metallic Glass Matrix Composites

“…It can not only generate diffraction patterns (kikuchi lines) [96] but can efficiently map the presence of different phases (of distinct crystal structure) [82] in a bulk of material [97] and compare them with existing crystal structures in international crystallographic diffraction database. With the augmentation of energy dispersive X-ray spectroscopy (EDS) detector, it can also generate elemental maps which can serve as input for back scatter diffraction data collection [94,98]. It also generates pole figures and grain size histograms which again can be used to determine mechanical properties of material.…”

Characterization and Corrosion Resistance of Boron-Containing-Austenitic Stainless Steels Produced by Rapid Solidification Techniques

“…For instance, bulk amorphous steels (BAS) have been a subject of great interest due to their unique characteristics such as excellent magnetic properties, high hardness and fracture strength, and an attractive combination of resistance to corrosion and wear [2,3,4,5]. Compared to other bulk amorphous alloy systems (e.g., Pd- and Zr-based alloys), BAS have much lower material cost and higher thermal stability which are attractive for industrial applications [6,7,8,9]. However, the glass forming ability (GFA) of the designed BAS has to be sufficiently high to ensure amorphization by using commercial-grade raw materials, such as steels and iron-alloys.…”