Low-modulus β-Ti alloys that are composed of non-toxic and allergy-free elements have been recently paid keen attention for medical applications. The effect of severe plastic deformation by high-pressure torsion (HPT) is presently investigated in β-Ti alloys in aiming at developing materials with remarkable grain refinement and high strength. [Method] The HPT process was carried out on Ti-30Nb-10Ta-5Zr (TNTZ) and Ti-15Mo (in mass%) disks with a diameter of 10 mm and thickness of 0.85 mm under a pressure of 5 GPa and rotation speed of 0.2 rpm for up to 50 turns. The microstructure of the processed samples was investigated by optical microscopy (OM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Microhardness testing was performed to gain information on the localized hardness profile in different areas of the samples.
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