Abstract: Effect of Mo content on microstructure, phase composition, mechanical properties and corrosion resistance of as-cast Ti-20Zr-10Nb-xMo alloys (x=0,3,6,9,wt%) was studied by means of X-ray diffraction, optical microscope, microhardness test, compressive test and electrochemical workstation. The results show that with the increase of Mo content, the phase structure of Ti-20Zr-10Nb-xMo alloys obviously changes from α′+β→α″+β→β, and the average grain size decreases gradually with the increase of Mo content. When the Mo content is 9%,the average grain size of the alloy is about 45 μm. With the addition of Mo, the compressive strength and yield strength of the alloy first decrease and then increase, while the microhardness increases first and then decreases. When the Mo content is 9%, the compressive strength and compressive strain are 1610 MPa and 50.9%, respectively. The self-corrosion current density and R_p value of the tested alloy without Mo addition are the minimum of 33.19 nA·cm^-2, the maximum of 1531.52 kΩ·cm², respectively, and the corrosion resistance is the best.

Key words: Ti alloy, phase structure, microstructure, mechanical properties, corrosion behavior