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High pressure torsion induced lowering of Young's modulus in high strength TNZT alloy for bio-implant applications

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Maity, T.
Gammer, C.
Ivanov, E.
Eckert, J.
Prashanth, K. G.

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An exceptional combination of low Young's modulus (E similar to 68 GPa) and high flow strength (sigma(f) similar to 1 GPa) was achieved for a consolidated beta-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 similar to 73 GPa (N-HPT(10)) and E similar to 68 GPa (N-HPT(40)) 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 beta-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.

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Elsevier

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Engineering, biomedical, Materials science, biomaterials

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Journal of The Mechanical Behavior of Biomedical Materials

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10.1016/j.jmbbm.2020.103839

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