Mechanical Properties and Damage Performance of Zr-based BMG-W Energetic Fragments
To reveal the synergistic enhancement mechanism of strength and plasticity of Zr-based BMG-W energetic fragments and elucidate their impact damage process,a series of Zr-based BMG-W energetic fragments with different spherical W particle contents are prepared by the spark plasma sintering method.The mechanical properties and damage performance of Zr-based BMG-W energetic fragments are thoroughly studied through quasi-static compression experiments and ballistic gun loading penetration experiments on double-layer targets.The research results show that the addition of W particles significantly improves the mechanical properties of Zr-based BMG-W energetic fragments.The Zr-based BMG-W energetic fragments with sintering temperature ranging from 370 ℃ to 385 ℃ and W particle content ranging from 20 vol.％to 40 vol.％have better strength and plasticity than pure BMG energetic fragments.Among them,the Zr-based BMG-40W energetic fragment prepared at 380 ℃ has the highest fracture strength and plastic strain,which are 2 047.0 MPa and 16.6％,respectively.The synergistic enhancement mechanism of strength and plasticity of Zr-based BMG-W energetic fragments includes two aspects:W particles hinder the rapid expansion of shear bands,promote their turning and proliferation,and delay the fracture failure of energetic fragment;the initiation and propagation of shear bands caused by modulus mismatch result in the formation of local plastic deformation zones in the BMG matrix near the W particles,reducing the spatial constraint of BMG matrix on the W particles.The W particles themselves undergo plastic deformation,delaying the fracture failure of energetic fragments.With the increase in W particle content,the damage performance of the Zr-based BMG-W energetic fragments increases first and then decreases,but all are better than pure BMG energetic fragments.Among them,the Zr-based BMG-40W energetic fragment has the strongest damage performance with an expansion ratio of 27.9.The impact damage process of Zr-based BMG-W energetic fragments mainly includes primary detonation,kinetic energy perforation,secondary detonation,and aftereffect damage.
energetic fragmentmechanical propertydouble-layer targetdamage performanceexpanding perforation area
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