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Fabrication of Mechanically Tunable and Bioactive Metal Scaffolds for Biomedical Applications
Published on: December 8, 2015
Beta type Ti-Mo alloys with changeable Young's modulus for spinal fixation applications
Xingfeng Zhao1, Mitsuo Niinomi, Masaaki Nakai
1Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai, Japan.
Acta Biomaterialia
|February 14, 2012
Summary
Researchers developed a novel biomedical titanium alloy for spinal rods. This alloy exhibits a changeable Young
Area of Science:
- Biomedical Engineering
- Materials Science
- Metallurgy
Background:
- Spinal fixation devices require materials with specific mechanical properties for spinal rods.
- Titanium alloys are widely used in biomedical implants due to their biocompatibility and mechanical strength.
- Controlling Young's modulus is crucial for spinal rod applications to match bone elasticity and minimize stress shielding.
Purpose of the Study:
- To develop a novel biomedical titanium alloy with a tunable Young's modulus for spinal rods.
- To investigate the effect of deformation-induced ω phase transformation on the mechanical properties of Ti-Mo alloys.
- To evaluate the suitability of optimized alloys for spinal fixation devices.
Main Methods:
- Preparation of metastable β-type binary Ti-(15-18)Mo alloys.
- Systematic examination of microstructures, Young's moduli, and tensile properties.
- Investigation of deformation-induced ω phase transformation during cold rolling and its effect on mechanical properties.
- Assessment of springback behavior of the optimal alloy.
Main Results:
- Ti-(15-18)Mo alloys after solution treatment exhibited a β phase with a small amount of athermal ω phase and low Young's moduli.
- Cold rolling induced ω phase transformation, leading to an increase in Young's modulus in all investigated alloys.
- Deformation-induced ω phase transformation was accompanied by {332}(β) mechanical twinning, maintaining ductility with high strength.
- Ti-17Mo alloy demonstrated the lowest initial Young's modulus and the largest modulus increase, with minimal springback.
Conclusions:
- Deformation-induced ω phase transformation is an effective mechanism for tuning the Young's modulus of Ti-Mo alloys.
- The Ti-17Mo alloy exhibits desirable mechanical properties, including a tunable Young's modulus, high strength, acceptable ductility, and low springback.
- Ti-17Mo alloy is a promising candidate material for spinal rods in spinal fixation devices.
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