Mechanical properties and structural features of novel Fe-based bulk metallic glasses with unprecedented plasticity

Abstract

Fe-based bulk metallic glasses (BMGs) have attracted great attention due to their unique magnetic and mechanical properties, but few applications have been materialized because of their brittleness at room temperature. Here we report a new Fe50Ni30P13C7 BMG which exhibits unprecedented compressive plasticity (>20%) at room temperature without final fracture. The mechanism of unprecedented plasticity for this new Fe-based BMG was also investigated. It was discovered that the ductile Fe50Ni30P13C7 BMG is composed of unique clusters mainly linked by less directional metal-metal bonds which are inclined to accommodate shear strain and absorbed energy in the front of crack tip. This conclusion was further verified by the X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy experiments of Fe80-xNixP13C7 (x = 0, 10, 20, 30) and Fe72-xNixB20Si4Nb4 (x = 0, 7.2, 14.4, 21.6, 28.8) glassy systems. The results also indicate a strong correlation between the p-d hybridization and plasticity, verifying that the transition from brittle to ductile induced by Ni addition is due to the change of bonding characteristics in atomic configurations. Thus, we can design the plasticity of Fe-based BMGs and open up a new possible pathway for manufacturing BMGs with high strength and plasticity.

Metallic Glass Nano-composite Thin Films for High-performance Functional Applications

“…3c). 31 The peaks get further suppressed for the 200-nm film, with both Ag and Cu peaks of comparable intensity. The increased volume fraction of nano-crystallites for the 100-nm and 200-nm films likely results in greater surface and grain boundary scattering of electrons resulting in lower conductivity.…”

Effectiveness of hydrogen microalloying in bulk metallic glass design

“…This structural heterogeneity may also be related to changes in bonding, as hydrogenation is known to change the density of states in Zr-based glasses [35], in particular decreasing the amount of d-electrons near the Fermi level [36]. As such, hydrogen microalloying is expected to increase the degree of metallic bonding in Zr-based glasses [37] and thus to improve their ductility.…”

Influence of the Quenching Rate on the Structure and Magnetic Properties of the Fe-Based Amorphous Alloy

“…By means of the scanning electron microscopy (SEM) study, information about the types of breakthroughs of the amorphous alloys can be obtained. This will allow for comparison of the degree of relaxation of the amorphous structure [15,16]. The degree of relaxation of the amorphous structure is very important as it affects the magnetic properties of the alloy [13].…”