Combined effect of Ni and nano-Y2O3 addition on microstructure, mechanical and high temperature response ofW-Mo alloy

Abstract

The present research work deals with the synthesis of nanostructured tungsten (W) based alloys with the nominal compositions of W70Mo30 and 1.0 wt. % nano-Y2O3 dispersed W79Ni10Mo10 (in wt. %) by mechanical alloying followed by compaction at 1GPa pressure for 5 mins and conventional sintering at 1500C for 2 h in Ar atmosphere. The microstructure and evolution of phases during milling and consolidated products are investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Minimum crystallite size of 29.4 nm and maximum lattice strain and dislocation density of 0.51% and 18.93 (1016/m2) respectively is achieved in 1.0 wt. % nano-Y2O3 dispersed W79Ni10Mo10 alloy at 20 h of milling. W79Ni10Mo10 alloy with 1.0 wt. % nano-Y2O3 dispersed alloy shows maximum sintered density, hardness and strength of 95.2%, 9.12 GPa and 1.51 GPa respectively as well as maximum wear and oxidation resistance (at 1000°C) resistance as compared to that ofW70Mo30.