Microstructure and Mechanical Properties of Ti-Mo Alloys by Powder Metallurgy Process

Ti-(8 similar to 20)Mo alloys made from elemental powders were fabricated by a powder metallurgy technique. The effects of sintering temperature and Mo content on the microstructure and mechanical properties were studied. The results show that the Ti-Mo alloys with high-density and uniform microstructure can be produced in the sintering temperature range of 1400 similar to 4500 degrees C. The lowest sintering temperature for densification gradually increases with the rise of Mo content. Ti-(8 similar to 16)Mo alloys exhibit typical widmanstatten structure, whereas the Ti-20Mo alloy consists of single equiaxed beta grains. In the range of 8%similar to 46% of Mo, increasing Mo content can decrease beta grains in size, and correspondingly the a lamellars become less and thinner. The as-PMed Ti-(8 similar to 20)Mo alloys show good mechanical performance, and possess lower elastic modulus of 59 similar to 68 GPa. In comparison, the Ti-14Mo alloy sintered at 1450 degrees C exhibits superior mechanical properties with hardness of 35.7HRC, compressive strength of 2227 MPa, compression rate of 29.1%, and elastic modulus of 62.2 GPa.