Effect of thermomechanical treatment on the mechanical and microstructural evolution of a β-type Ti-40.7Zr–24.8Nb alloy

Abstract

In this study, the microstructural evolution and mechanical properties of a newly developed Ti-40.7Zr–24.8Nb (TZN) alloy after different thermomechanical processes were examined. As-cast TZN alloy plates were solution-treated at 890 °C for 1 h, after which the thickness of the alloy plates was reduced by cold rolling at reduction ratios of 20%, 56%, 76%, and 86%. Stress-induced α” formation, {332} <113> β mechanical twinning, and kink band formation were observed in the cold-rolled TZN alloy samples. In the TZN sample after cold rolling at the 86% reduction ratio plus a recrystallization annealing at 890 °C for 1 h, the deformation products of a stress-induced α” phase, {332}<113> β mechanical twinning, and kink bands disappeared, resulting in a fine, equiaxed single β phase. The alloy samples exhibited elongation at rupture ranging from 7% to 20%, Young's modulus ranging from 63 to 72 GPa and tensile strength ranging from 753 to 1158 MPa. The TZN alloy sample after cold rolling and recrystallization annealing showed a yield strength of 803 MPa, a tensile strength of 848 MPa, an elongation at rupture of 20%, and an elastic admissible strain of 1.22%, along with the most ductile fractures during tensile testing.

Surface Properties and Mechanical Performance of Ti-Based Dental Materials: Comparative Effect of Valve Alloying Elements and Structural Defects

“…[20][21][22][23][24] Techniques based on typical methods of deformation, such as multiple-stage cold rolling, are of particular interest as they can be scaled up to the industrial level. [6,[25][26][27] The huge number of grain boundaries and dislocations introduced during large plastic deformation affect the material's mechanical properties as well as functional features such as corrosion resistance. [20,28,29] It is well known that the high corrosion resistance of Ti and its alloys is governed by the presence of a nanometric protective oxide layer on their surfaces.…”

Coinciding significance of the crystallographic orientation and nanostructuring on the biocompatibility of TZNT‐Ag1.5 alloy deformed by the cold rolling process

“…Mostly, in the low stabilized β Ti alloys (or low SFE), the thick laths were considered as the deformation twins, while the parallel lines into larger grains are band structures [36,37]. These band structures were also seen in other β Ti alloys [36]. In those studies, it was confirmed that these band structures were kink bands, and they could have an important role in the texture evolution and plasticity of the metastable β type Ti alloys [37].…”

“…Mostly, in the low stabilized β Ti alloys (or low SFE), the thick laths were considered as the deformation twins, while the parallel lines into larger grains are band structures [36,37]. These band structures were also seen in other β Ti alloys [36].…”

Review of the Design of Titanium Alloys with Low Elastic Modulus as Implant Materials

“…elements and some other incipient implant alloys [17][18][19][20][21][22] are shown in Figure 2. The elastic modulus of implant materials decreases gradually from 220 GPa for ASTMF75 CoCr alloy to 42 GPa for Ti-24Nb-4Zr-8Sn.…”

“…Lots of scientists and engineers have been devoted to develop Ti alloys with a low elastic modulus. [ 14–16 ] The typical Ti alloys with a low elastic modulus, E , and free of toxic alloying elements and some other incipient implant alloys [ 17–22 ] are shown in Figure . The elastic modulus of implant materials decreases gradually from 220 GPa for ASTMF75 CoCr alloy to 42 GPa for Ti–24Nb–4Zr–8Sn.…”