Effect of Mn content on mechanical properties and corrosion resistance of Ti-8Mo-xMn alloys through the vacuum sintering process

This study mixed various powders (Ti, Mo, and Mn) according to the nominal Ti-8Mo-xMn (x = 1, 3, 5 wt%) composition, and vacuum sintered the compacts of the Ti-Mo-Mn alloys at 1220 degrees C, 1240 degrees C, 1260 degrees C, and 1280 degrees C for 1 h. The experimental results show that the Ti-8Mo-3Mn alloys sintered at 1260 degrees C had better comprehensive properties, with a relative density of 96.71 +/- 0.14 %, transverse rupture strength (TRS) of 1624.4 +/- 29.2 MPa, and hardness of 67.8 +/- 0.4 HRA. However, due to the microstructure evolution and increased amount of Mn in the Ti-8Mo-xMn alloys, the TRS shows a significant increase. Consequently, the suitable Mn content of the Ti-8Mo-3Mn alloys, which proves advantageous to the TRS, results from the uniformly distributed lamellar-like Widmanst & auml;tten microstructure and the basket-net microstructure. Moreover, the Ti-8Mo-xMn alloy does not have intermetallic compounds, and only consists of two phases, alpha-Ti and beta-Ti. Furthermore, the sintered Ti-8Mo-3Mn alloys possess the suitable corrosion current (I-corr was 4.56 x 10(-5) A cm(-2)) and polarization resistance (R-corr was 569.76 Omega cm(2)) in 0.1 N H2SO4 solutions, which confirms that sintered Ti-8Mo-3Mn alloys can improve mechanical properties.