High pressure torsion induced lowering of Young's modulus in high strength TNZT alloy for bio-implant applications. (August 2020)

• Record Type: Journal Article
• Authors: Maity, T.; Balcı, Ö.; Gammer, C.; Ivanov, E.; Eckert, J.; Prashanth, K.G.
• Is Part Of: Journal of the mechanical behavior of biomedical materials. Volume 108(2020)
• Publication Date: 2020-08
• Subjects: β-Ti alloy -- Micro-/nanoindentation -- High-pressure torsion -- Strain-rate sensitivity -- Activation volume -- Young's modulus; Biomedical materials -- Periodicals; Biomedical materials -- Mechanical properties -- Periodicals; Biomedical materials; Biomedical materials -- Mechanical properties; Periodicals; Electronic journals; 610.28
• DOI: 10.1016/j.jmbbm.2020.103839
• Languages: English
• ISSNs: 1751-6161

Abstract

Abstract: An exceptional combination of low Young's modulus ( E ~68 GPa) and high flow strength ( σ f ~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 H P T 10 ) and E ~68 GPa ( N H P T 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 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.