Design Of W-Mo-Ti Flier-plate With Graded Wave Impedance And Study On Its Relative Physical Properties

By employing 3.5%Ni-3.5%Cu and 3.0%Fe-1.5%Al as additives respectively,almost fully densified W-Mo and Mo-Ti composites with different component proportion are successfully obtained under the same sintering technical conditions of 1473K-30MPa-10min in a vacuum furnace.The phase compositions,element area distributions and microstructures of the samples demonstrate that the W-Mo and Mo-Ti composites can be seen as simple mixture systems. So,the ideal mixture model is adopted to estimate their densities,volume velocities,wave impedances,specific heats,Gruneisen parameters and Hugoniot coefficients. Relative research indicates that not only the compositions but also microstructures of the composites affect their physical properties. In order to take microstructures into account,the tested values of the corresponding physical properties of W-alloy,Mo-alloy and Ti-alloy are used as basic data during estimation. And the estimated values match those tested ones very well.Several typical micromechanical models for elastic properties are introduced and compared in this paper. Self-consistent model surfaces as an attractive method that provides good estimates at minimal effort with no empirical fitting parameters in the whole composition spectrum. Consequently,it is employed to estimate the elastic properties of W-Mo and Mo-Ti composites and good estimates are obtained.At last,flier-plates with graded wave impedance are designed using density and wave impedance as design parameter respectively. The design results show that the wave impedance distribution of flier-plate can be controlled more accurately by using wave impedance as design parameter directly. The numerical simulations of loading processes of flier-plates show that the loading history of the flier-plate designed with wave impedance as design parameter is significantly different from that of the flier-plate designed with density as design parameter and the former is expected to have better quasi-isentropic characteristic,which indicates that it is very essential to use wave impedance as design parameter directly to design the wave impedance distribution of flier-plate.