Mechanical properties and impact energy release characteristics of Al_0.5NbZrTi_1.5Ta_0.8Ce_0.85 high-entropy alloy

Abstract

To explore the potential of high-entropy alloys (HEAs) as energetic structural materials (ESMs), Al0.5NbZrTi1.5Ta0.8Ce0.85 high-entropy alloys were prepared by vacuum arc melting. XRD and TEM indicated the coexistence of BCC and FCC structures. SEM images illustrated element segregation in HEA. HEA exhibited excellent mechanical properties and impact energy release characteristics. When the strain rate increased from 10-3 s-1 to 4500 s-1, the yield strength increased by 56.2% from 909 MPa to 1420 MPa. Under impact, the threshold of strain rate of HEA was about 1200 s-1. Bal-listic gun tests were performed to investigate the penetration behavior and energy-releasing characteristics. Al0.5NbZrTi1.5Ta0.8Ce0.85 could penetrate 6mm A3 plate at the speed of 712 m/s and ignite the cotton behind the target, combining excellent mechanical properties and impact energy release characteristics.

Effects of ZrO2 ceramics doped with varying content on the mechanical properties and energy release characteristics of W-Zr alloys

“…where E is the modulus of elasticity of the rod; c 0 is the wave velocity of the stress wave; A and A 0 are the crosssectional area of the rod and the specimen; l 0 is the length of the specimen; ε t and ε r are the strains of the incident rod and transmitted rod; and  e is the strain rate, respectively [12].…”

Numerical Simulation Study on Impact Initiation on Shielded Charge Using Hypervelocity Composite-Structure Reactive Fragments

“…Due to the limitations of the materials’ own properties and damage modes, it is very difficult to further improve their damage power. In recent years, reactive materials have attracted the attention of various powerful countries, and the types of reactive materials have diversified, with examples including thermite, metal/polymer mixtures [ 1 , 2 , 3 ], intermetallic compounds [ 4 , 5 ], Zr-based amorphous alloys [ 6 , 7 , 8 , 9 , 10 ], and high-entropy alloys [ 11 , 12 , 13 , 14 ]. The damage elements made of these materials have the dual damage effect of kinetic energy penetration and chemical energy release.…”