High pressure torsion induced lowering of Young's modulus in high strength TNZT alloy for bio-implant applications.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 32469711.
- Also identified by DOI 10.1016/j.jmbbm.2020.103839.
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Abstract
An exceptional combination of low Young's modulus (E ~68 GPa) and high flow strength (σ<sub>f</sub> ~1 GPa) was achieved for a consolidated β-Ti-based metastable Ti-35Nb-7Zr-5Ta (TNZT) alloy subjected to room temperature high-pressure torsion (HPT). The mechanical properties of the alloy were studied by quasistatic nanoindentation tests at different strain rates, where a reduction in Young's modulus E ~73 GPa (N<sub>HPT</sub><sup>10</sup>) and E ~68 GPa (N<sub>HPT</sub><sup>40</sup>) is observed together with an increase in plastic deformability (or HPT rotations). The microstructure evolution with increasing shear strain has been investigated. The stabilized bcc β-Ti phase with homogeneous nanostructure distribution was observed leading to a low Young's modulus. Severe straining causes a uniform hardness distribution without any noticeable change in the strength of the material. This study may be useful for developing excellent removable implant materials.
Medical subject headings
- Alloys
- Titanium