Study of Elasto-Plastic Transition, Phase Transition and Equation of State of Ceramics

Abstract

Shock compression research of solids started at USA and former Soviet Union before 1960 age using explosive method, and had developed mainly at USA using also propellant guns. However, research of ceramics had been almost left untouched. We have established various kinds of measurement methods, and have led the shock compression study of ceramics. The elasto-plastic transition, high-pressure phase transition, equation of state of Al₂O₃, ZrO₂, TiO₂, Si₃N₄, AlN, NiO, ZnS, B₄C, TiB₂, Gd₃Ga₅O₁₂, MgO, ZnO, TeO₂, PbF₂, etc. had been investigated by shock compression. And, the synthesis of new metastable substances and the shock metamorphism, such as B1-type TaN, orthorhombic HfO₂, CaCl₂-type RuO₂, Sm₂Fe₁₇N_x bulk magnet, defective ZnMgS and some solid-solution bulk alloy of immiscible systems such as Fe-Cu, Co-Cu system, and the shock metamorphism have been studied as well as some unique physical properties of these materials. Here, our developments of shock-wave measurement systems and the results are reviewed mainly on ceramics.