Dynamic behaviors of a Zr-based bulk metallic glass under ramp wave and shock wave loading

Abstract

Dynamic behaviors of Zr51Ti5Ni10Cu25Al9 bulk metallic glass were investigated using electric gun and magnetically driven isentropic compression device which provide shock and ramp wave loading respectively. Double-wave structure was observed under shock compression while three-wave structure was observed under ramp compression in 0 ∼ 18GPa. The HEL of Zr51Ti5Ni10Cu25Al9 is 8.97 ± 0.61GPa and IEL is 8.8 ± 0.3GPa, respectively. Strength of Zr51Ti5Ni10Cu25Al9 estimated from HEL is 5.0 ± 0.3GPa while the strength estimated from IEL is 3.6 ± 0.1GPa. Shock wave velocity versus particle velocity curve of Zr51Ti5Ni10Cu25Al9 under shock compression appears to be bilinear and a kink appears at about 18GPa. The Lagrangian sound speed versus particle velocity curve of Zr51Ti5Ni10Cu25Al9 under ramp wave compression exhibits two discontinuances and are divided to three regions: elastic, plastic-I and plastic-II. The first jump-down occurs at elastic-plastic transition and the second appears at about 17GPa. In elastic and plastic-I regions, Lagrangian sound speed increases linearly with particle velocity, respectively. Characteristic response of sound speed in plastic-I region disagree with shock result in the same pressure region(7GPa ∼ 18GPa), but is consistent with shock result at higher pressure(18-110GPa).

Behaviors of bulk metallic glass under shock loading

“…In [5] a Zr-based BMG subjected to uniaxial tensile strain in plate-impact experiments under compressive loading with peak stresses ranging between 3.9 and 6.1 GPa, in the result of wave interactions produced tensile loading leading to spallation in the BMG samples. Tensile fracture or spall, observed in these experiments, was initiated at a tensile stress of 3.8±0.3 GPa and 3.6±0.1 GPa in [7]; this value was independent of the impact stress and is significantly higher than that observed for crystalline metals. T. Mashimo with coauthors [8] bulk metallic glass (BMG) were investigated by using a planar impact technique on an electrical explosion of conductor (EEC) installation.…”

“…Several Us-Up curves of Zr based BMGs reported in literatures [7]. It can be seen that a kink appears at particle velocity 380m/s ~ 660m/s (pressure range 14GPa ~ 26GPa) for Zr-based BMGs, and for Zr 57 Nb 5 Cu 15.4 Ni 12.6 Al 10 BMG, a second kink appears at 1.7km/s.…”

“…Authors [4] studied the shock wave response of (Hf,Zr)-based bulk amorphous alloy specimens subjected to peak stresses of 4-16 GPa in plate impact experiments and their response was compared to a previously studied Zr-based BMG and reported that the (Hf,Zr)-based BAA displayed a Hugoniot elastic limit (HEL) of 7.4 GPa corresponding to an elastic strain of 4.3%. Turneaure and his co-workers [5,6] reported that the HEL stress of Zr 56.7 Cu 15.3 Ni 12.5 Nb 5.0 Al 10.0 Y 0.5 BMG was determined to be 7.1 ± 0.3 GPa and 8.97±0.61 GPa in [7]. In [5] a Zr-based BMG subjected to uniaxial tensile strain in plate-impact experiments under compressive loading with peak stresses ranging between 3.9 and 6.1 GPa, in the result of wave interactions produced tensile loading leading to spallation in the BMG samples.…”

Localized atomic segregation in the spalled area of a Zr50Cu40Al10 bulk metallic glasses induced by laser-shock experiment

“…The shock wave instability related to pressure just above the HEL highlighted a strain-softening response that is well known in static to be a characteristic response upon loadings exceeding the elastic domain. Smirnov et al and Luo et al also reported the HEL of a Zr 55 AlNiCu [14] and a Zr 51 Ti 5 Ni 10 Cu 25 Al 9 [15] BMG, respectively, to be around 4.5 GPa and 8.9 GPa. Arman et al used molecular dynamic simulations to follow the evolution of icosahedral structures on a binary Cu 46 Zr 54 BMG for pressure range around the elasto-plastic transition to determine how some icosahedral configurations contribute to strain-softening [13].…”