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In order to study the effect of Mo on the microstructure, mechanical properties and corrosion behavior of commercially pure titanium (cp-Ti), Ti- x Mo ( x  = 5, 10, 15, and 20 wt.%) alloys were investigated. The phase and microstructures were characterized using X-ray diffraction, optical microscopy, scanning electron microscopy and transmission electron microscopy. The results indicated that the Ti-5Mo alloy was mainly composed of α′ phase with a small fraction of α″ phase. The Ti-10Mo was dominated by orthorhombic α″. The Ti-15Mo alloy was mainly composed of α″ phase with a small fraction of β phase. The volume percentage of the β phase increased with increasing Mo content. The Ti-20Mo alloy was mainly composed of β phase. We also investigated the effect of alloying with Mo on the Vickers hardness and corrosion behavior of Ti- x Mo alloys. The addition of Mo not only caused hardening of cp-Ti but also improved its oxidation protective ability. Electrochemical results showed that the Ti- x Mo alloys exhibited improved corrosion resistance over cp-Ti.

Effect of molybdenum on the microstructure, mechanical properties and corrosion behavior of Ti alloys