Microstructure and Mechanical Properties Change with Cold Deformation of the Biomedical Ti-17Nb-6Ta-3Zr Alloy

• Published in: Key engineering materials 2018-09, Vol.780, p.15-19
• Main Authors: Hamada, Atef S., Nakamura, Koichi, Nyamuchiwa, Kudakwashe, Gepreel, Mohamed Abdel Hady
• Format: Article
• Language: English
• Subjects: Biocompatibility; Biomedical materials; Cold; Cold working; Compression tests; Elastic deformation; Elastic recovery; Electric arc melting; Martensite; Martensitic transformations; Mechanical properties; Modulus of elasticity; Optical microscopy; Phase stability; Strain; Structural analysis; Surgical implants; Titanium base alloys; X-ray diffraction; Yield stress
• ISSN: 1013-9826; 1662-9795; 1662-9795
• DOI: 10.4028/www.scientific.net/KEM.780.15

This study is to investigate the phase stability, cold deformation, elastic strain recovery and mechanical properties of a new Ti-17Nb-6Ta-3Zr, at. %, alloy for biomedical applications. The alloy was produced by arc melting. A heavy cold-working up to 90 % was applied to the alloy to investigate the stability of the predominant β-bcc structure. Characterization of the deformed structures was performed by X-ray diffraction (XRD), hardness measurements and optical microscopy. Quasi-static compression testing was conducted to determine the yield stress for stress induced martensitic (SIM) transformation and the Young modulus. XRD analysis of the cold-worked structures revealed that α-martensite was induced after less than 5 % deformation. An outstanding combination of strength-elasticity properties with the yield strength of 600 MPa and a Young modulus of 37 GPa was achieved during the compression tests.