Abstract
The influences of Mo addition on the tensile properties and deformation behavior of β-type Ti-Mn alloys were investigated with particular focus on {332}<113> deformation twinning. We found that Ti-7Mn and Ti-5Mo-3Mo alloys exhibit completely different tensile properties, despite having the same microstructure and stability of the β phase. The Ti-5Mn-3Mo alloy demonstrates higher tensile strength and larger ductility than the Ti-7Mn alloy due to its strong work hardening, caused by {332} <113> deformation twinning. The critical resolved shear stress (CRSS) for {332}<113> deformation twinning in these alloys was measured by compression tests using single crystals. It was thereby found that Mo addition is effective in decreasing the CRSS for {332}<113> deformation twinning in Ti-Mn alloys.
Highlights
Owing to their high specific strength, good biocompatibility, and corrosion resistance, titanium (Ti) and its alloys find wide use in many biomedical applications that include bone plates, hip joints, and spinal fixation devices [1,2,3,4]
transmission electron microscopy (TEM) analyses indicates that the nanosized athermal ω phase is dispersed uniformly in these alloys
The values of 0002 to 222 reciprocal lattice vector ratios (d*0002/d*222) [19] as calculated by the selected area electron diffraction patterns are 0.662 for both TM7 and TMM53. This indicates that the b matrixes of both TM7 and TMM53 have similar phase stability
Summary
Owing to their high specific strength, good biocompatibility, and corrosion resistance, titanium (Ti) and its alloys find wide use in many biomedical applications that include bone plates, hip joints, and spinal fixation devices [1,2,3,4]. In order to overcome this problem, some β-type Ti alloys were developed as low-Young’s modulus alloys. The Ti-29Nb-13Ta-4.6Zr alloy is characterized by a Young’s modulus of approximately 60 GPa [8], an excellent strength-ductility balance [9] and good fatigue properties [10]. Present β-type Ti alloys contain high-cost elements such as niobium (Nb) and tantalum (Ta). It is necessary to develop new low-cost
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