Influence of Defects to Zr65Cu18Ni7Al10 Bulk Metallic Glass Properties Under Dynamic Compression

Abstract

The Zr65Cu18Ni7Al10 bulk metallic glass with smaller diameter exhibits higher fracture strength under dynamic compression, which is ascribed to concentration of flow defect. The density of shear bands in the sample surface will increase with decreasing of the diameter, whereas, average distance and width of tear ridges in the fracture surface will increase with larger diameter. In addition, the volume of shear transformation zone can be estimated, which presents a ductile-to-brittle transition with the change of diameter. The physical graph of shear transformation zone can be obtained from the experimental analysis.

Nanoscale Creep Behavior and its Size Dependency of a Zr-Based Bulk Metallic Glass Manufactured by Selective Laser Melting

“…As a consequence, the decreasing tendency of the creep resistance is largely attributed to the diminution of the STZ volume as well as the greater ratio of plastic flow under the higher maximum load. Furthermore, the values of STZ volume in the current work are around 2 nm 3 , which are smaller than the Zr-based MGs manufactured by other methods [36,71,72]. The smaller volume of STZ is responsible for the smaller creep stress exponent and the corresponding creep resistance in the AM-ed MG.…”