EXPERIMENTAL STUDY ON W-Ni ALLOY FORMABILITY UNDER EXPLOSIVE LOADING

Abstract

This paper presents an experimental study of the formability of W-Ni alloys with three different densities using the explosive loaded flyer plate method, so as to explore the highdensity alloy suitable for explosively formed projectile liner. The results showed that the tested materials all suffered different degrees of fracture failure and could not form a complete penetrator, which could not be used as a candidate material for the explosively formed projectile (EFP) liner. Based on the results, the forming performances of the tested materials were compared and analyzed. Combined with the material microstructure, the failure mechanism of W-Ni alloys was analyzed, and the feasibility of using W-Ni alloys as EFP liner materials was discussed. The forming performance of W-Ni alloys under the explosive loading condition was improved with a decrease in W content. Its microscopic mechanism lies in the increase of the matrix phase content, which enhances the coordination ability of dislocation movement to plastic deformation. The failure of W-Ni alloys is attributed to the difference in performance between the different phases of the multiphase alloy. When W is completely dissolved in the nickel-based ductile matrix, the W-Ni alloy is transformed from a multiphase material to a single-phase alloy (FCC), completely eliminating the dislocation pile-up problem due to the presence of the W phase. The singlephase structure may be necessary for the W-Ni alloy to be a candidate material for the EFP liner.