Mechanical and electrochemical characterisation of new Ti-Mo-Nb-Zr alloys for biomedical applications

Journal of the Mechanical Behavior of Biomedical Materials
Paul S NnamchiM W Rainforth

Abstract

The development and characterisation of new metallic biomaterials that contain non-toxic and non-allergic elements but possess low elastic modulus and low biodegradation rates, has become a topic of serious investigation in orthopaedic implant application. The lowering of elastic modulus and improving of corrosion resistance can be achieved by specific chemical alloying and super-elasticity effects, associated with a stress-induced phase transformation from the BCC metastable beta phase to the orthorhombic α″ martensite. Using this framework, this paper focuses on the effect of Nb and/or Zr micro-additions on the elastic modulus/yield strength balance and discusses microstructure, and the mechanical and electrochemical behaviour of four new β-Ti-8Mo-xNb-xZr (x=2-5) alloys, using tensile tests, X-ray diffraction, SEM characterisation, ultrasound technique and potentiodynamic polarisation methods. The results reveal that the alloys exhibit a pronounced microstructural sensitivity response, with alloying elements and excellent agreement between β-stability and high mechanical strength, with increasing Nb additions. Although all the alloys possess excellent corrosion resistance and low Young׳s modulus, Ti-8Mo-4Nb-2Zr alloy, which c...Continue Reading

Citations

Sep 29, 2017·Journal of Functional Biomaterials·Mythili PrakasamLiga Berzina-Cimdina
Oct 10, 2018·Materials·Weimin BaiLigang Zhang
Nov 6, 2020·Journal of Biomaterials Applications·Taomei ZhangHailin Yang

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