Effects of Mo,V and Ag additions on microstructure and mechanical properties of powder metallurgy Ti-5Al alloy

The powder metallurgy(P/M) Ti-Al-Mo-V-Ag alloys were processed by powder metallurgy using the blended elemental(BE) technique.The effects of Mo,V and Ag additions and sintering temperature on the microstructures and mechanical properties of the Ti-5Al alloys were investigated using optical microscope,scanning electron microscope and mechanical properties tests.The results show that adding Mo or V elements improves the compression strength of the based alloys after sintering at 1 350 ℃,and Ag element addition decreases the properties of Ti-5Al alloy.However,adding Ag element with Mo and V elements increases the density and compressive strength of P/M Ti-5Al alloy.The relative density and compressive strength of the Ti-5Al-4Mo-4V-5Ag alloy are 96% and 1 782 MPa,respectively.Moreover,the sintering temperature also affects the microstructures and properties of the PM Ti-5Al based alloys.