Structural stability and mechanical properties of amorphous metals

Development and Characterization of Low-Density Ca-Based Bulk Metallic Glasses: An Overview

“…The quaternary alloy gained more weight than the quinternary alloy, which was due to the faster corrosion rate in the former. Scanning electron microscopy analysis showed [62] that, after corrosion in water for~2100 hours, oxide films of thicknesses~18 to 23 lm and~7 to 11 lm were formed on the surfaces of, respectively, Ca 55 The results of this work indicate that the corrosion resistance of Ca-based BMGs can be considerably improved by combined alloying with Zn and Cu or alloying with Al. The alloy containing Al had the best corrosion resistance in water.…”

“…[53,54] The strain-induced softening is generally explained by an increase in the free volume and generation of shear bands with dislocation-like defects. [53][54][55][56] Development of some room-temperature ductility after preliminary high-temperature deformation is a rather interesting observation. Very brittle behavior at room temperature is due to random atomic arrangement and difficulty to initiate shear in the as-cast amorphous alloy.…”

“…High elastic energy accumulated during sample loading results in stress concentrations in chemically weak regions, leading to explosion-like fracture. On the other hand, preliminary plastic deformation at a higher temperature creates a number of shear bands in an amorphous sample, [55] which can be activated during following room-temperature compression. Cu 16 , was examined under normal flowing laboratory air and compared with the oxidation behaviors of these alloys in crystalline form under identical conditions.…”

“…The BMGs usually follow this oxidation-rate law. [57][58][59][60][61] These results show that the Ca 55 ) amorphous alloys were studied using static aqueous submersion at room temperature. [62] The results are shown in Figure 10.…”

Mechanically driven phase separation and corresponding microhardness change in Cu60Zr20Ti20 bulk metallic glass

“…22 Accordingly, the FWHM of the amorphous peak increases with due to the increased disorder of the metallic glass. 23 At this stage, we do not know whether the saturated free volume content has been achieved in the as-rolled specimen with = 89%, since after then phase separation occurs and the FWHM of the amorphous peak decreases owing to other reasons.…”