Mechanical Behaviors And High Velocity Impact Characteristics Of Zr-based Amorphous Alloy

With the development of human space exploring, the space environment keeps deteriorating, spacecrafts on orbit are facing more dangers, so,it is urgent to improve the protective ability of the spacecraft against space debris.Researching the new shield materials is critical to solve the problem. In this paper,several researches on the increasingly sophisticated Zr-based amorphous alloy material has been conducted, equipment of the experiments include universal testing machine, split Hopkinson pressure bar, two hydrogen guns and other analysis tools. Static compressive properties, dynamic compression behavior,high-speed impact damage characteristics and the protective effect were studied,which will provide experimental evidence for engineering application design of the Zr-based amorphous alloy material.The quasi-static compression experiment shows that the Zr-based amorphous alloy belongs to brittle material, and there is not plastic deformation during material failure period, the stiffness is similar to aluminum’s. But the ultimate strength is 1500 MPa, much higher than the aluminum alloy. Besides the failure strain is 2 %, and the material’s strain rate effect is not obvious.Dynamic compression experiment shows that the ultimate strength of the material grows with the strain rate’s growth when the strain rate is between400-850s-1, while the ultimate strength of the material decreases with the strain rate’s growth when the strain rate is between 850-1500s-1. Material stiffness in a dynamic compression is lower than with the quasi-static experiment’s, the failure strain of the material is 2.5%.In the research of the high speed impact damage characteristics, based on stress wave propagation theory, quantitatively analysis the relationship between the three perforated plates feature size and projectile diameter,projectile velocity,bumper thickness when the Zr-based amorphous material as front panel of the Whipple shield. And summarizes the four kind of fracture surface on the material perforation, besides the relationship between the crack propagation perforations,spallation phenomenon and the projectile speed.Finally, using Zr-based amorphous alloy material as the front panel of the Whipple shield, the paper carries out research work about the protective properties.The relationship between the four rear panel damage characteristic parameters and the projectile diameter, the impact velocity has been quantitatively analyzed,according to the physical phenomena that occur during impact,the paper describes plate injury situations and gives the appropriate explanation. Combining double plate Christiansen ballistic limit equation, as the Whipple bumper front plate ofprotective structures, the 2A12 aluminum alloy’s ballistic limit curve with equal areal density as the Zr-based amorphous material has been created, contrast protective properties of the two materials, found that the protective effect of the Zr-based amorphous alloys is better.