A comparative study of the rate effect on deformation mode in ductile and brittle bulk metallic glasses

Abstract

A B S T R A C TThe rate effect on the deformation mode of bulk metallic glasses (BMGs) is investigated by a comparative study between ductile and brittle compositions via real-time photographing. The strain-rate controls the deformation mode transition from shear-dominated sliding under quasi-static compression to cracking-dominated fracture under dynamic compression. In ductile BMGs, progressive sliding occurs at lower strain rate and contributes to a stable deformation manner. In brittle BMGs, however, unstable deformation occurs through rapid sliding even under quasi-static compression. Both ductile and brittle BMGs undergo unstable deformation under dynamic compression. The rate-dependent and composition-dependent tendency of stable or unstable deformation is well characterized by a model based on the ratio of the applied strain energy to the critical dissipation energy at the local shear banding region.

Effect of Strain Rate on Compressive Behavior of a Zr-Based Metallic Glass under a Wide Range of Strain Rates

“…In the experiment testing the amorphous compressive properties using the SHPB, due to the small size of the amorphous alloy, it is difficult to reach a strain rate of less than 500 s −1 . Only Zhou et al [16,17] have reached a strain rate of 300 s −1 . For a classic SHPB, as shown in Figure 3a, the incident and reflected stress waves were separated on the original incident strain gauge signal.…”

“…In the experiment testing the amorphous compressive properties using the SHPB, due to the small size of the amorphous alloy, it is difficult to reach a strain rate of less than 500 s −1 . Only Zhou et al [16,17] have reached a strain rate of 300 s −1 .…”

“…The deformation behavior under different strain rates has been widely regarded. Since Bruck et al [4] studied the high strain rate deformation behavior of Vit1 amorphous alloy (Zr 41.25 Ti 13.75 Cu 12.5 Ni 10 Be 22.5 ) using a split Hopkinson pressure bar (SHPB) test technique, numerous researchers have also studied a large number of strain rate effects in other amorphous systems [5][6][7][8][9][10][11][12][13][14][15][16][17], although a consensus is far from being reached. For example, for Vit1 alloy, Sunny et al [10] and Bruck et al [4] believed that the strain rate effect on the strength is slight, and Hufnagel et al [5] reputed the idea of a negative strain rate effect.…”

Research on explosive damage effects of tungsten fiber-reinforced Zr-based bulk metallic glass matrix composite shell

“…Zr-based bulk metallic glasses are high-strength materials with a tendency to ignite, making them potential candidates for use as shell materials for explosive projectiles (Zhou et al, 2018;Yang et al, 2021;Shen et al, 2022;Cai et al, 2023). However, Zr-based bulk metallic glasses have low toughness and require fibers to enhance toughness for use as explosive projectile shells.…”