Investigation on Process, Microstructure and Mechanical Properties of the Newly Developed near β type Biomedical Titanium Alloy TLM

The process, microstructure and typical mechanical properties of newly designed near β type titanium alloys Ti-(1.5-4.5)Zr-(0.5-5.5)Sn-(1.5-4.4)Mo-(23.5-26.5)Nb (TLM in short) were studied. The processing character and influential effects, different heat treatment and their related microstructure evolutions, and the tensile stress-strain behavior, tensile properties at high temperature, fatigue properties and wear resistance and so on were mainly discussed. The results are shown that Adding of elements Zr, Mo, Sn can strengthen Ti alloys, whereas element Mo, Nb and larger deforming-rate are helpful to decrease elastic modulus. The strength and modulus of the hot-rolled alloys decrease obviously after solid solution treatment, and then increase after aging treatment resulted from dispersion strengthening and fine grain strengthening. TLM alloy treated as hot rolled and ST condition leads to lower values of Rp / Rm and Rp/E resulted from stress induced martensite phase, which is helpful for secondary process and engineering application.