Improving the damage potential of W-Zr reactive structure material under extreme loading condition
| Autor: | Mei Li, Jianwei Jiang, Lu-yao Wang, Jianbing Men, Shuyou Wang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Materials science Scanning electron microscope Extreme loading Alloy Computational Mechanics Detonation Reactive structure material 02 engineering and technology engineering.material 01 natural sciences 010305 fluids & plasmas 020901 industrial engineering & automation Brittleness Coating 0103 physical sciences Composite material Damage potential Projectile Mechanical Engineering Metals and Alloys Fracture mechanics Military Science Structural integrity Ceramics and Composites engineering Deflagration |
| Zdroj: | Defence Technology, Vol 17, Iss 2, Pp 467-477 (2021) |
| ISSN: | 2214-9147 |
| DOI: | 10.1016/j.dt.2020.03.001 |
| Popis: | Projectiles made of reactive structure materials (RSM) can damage the target with not only kinetic but also chemical energy, but the enhanced damage potential of RSM may become compromised if extreme loading condition disintegrates the projectile before the target is reached. In this work, a ductile coating of Ni was introduced to a tungsten-zirconium (W-Zr) alloy, a typical brittle RSM, to preserve the damage potential of the projectile. Detonation driving tests were carried out with X-ray photography and gunpowder deflagration driving tests were carried out with high-speed photography for the coated and uncoated RSM samples, respectively. The craters on the witness target were analyzed by scanning electron microscopy and X-ray diffraction. The Ni coating was found to effectively preserve the damage potential of the W-Zr alloy under extreme loading conditions, whereas the uncoated sample fractured and ignited before impacting the target in both detonation and deflagration driving. The crack propagation between the reactively brittle core and the ductile coating was analyzed based on the crack arrest theory to mechanistically demonstrate how the coating improves the structural integrity and preserves the damage potential of the projectile. Specifically, the Ni coating envelops the W-Zr core until the coated sphere penetrates the target, and the coating is then eroded and worn to release the reactive core for the projectile to damage the target more intensively. |
| Databáze: | OpenAIRE |
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