Title

Evaluation of mechanical and wear properties of Ti[sbnd]xNb[sbnd]7Fe alloys designed for biomedical applications

Document Type

Journal Article

Publisher

Elsevier

Place of Publication

United Kingdom

School

School of Engineering

RAS ID

22031

Comments

Originally published as: Ehtemam-Haghighi, S., Prashanth, K. G., Attar, H., Chaubey, A. K., Cao, G. H., & Zhang, L. C. (2016). Evaluation of mechanical and wear properties of Ti[sbnd]xNb[sbnd]7Fe alloys designed for biomedical applications. Materials and Design, 111, 592-599. Available here

Abstract

A group of Ti[sbnd]xNb[sbnd]7Fe (x = 0, 1, 4, 6, 9, 11 wt.%) alloys was designed and produced by cold crucible levitation melting process. The microstructural characteristic of the alloys with Nb addition and its effect on their mechanical properties as well as wear resistance were investigated. Microscopic and phase analysis results show that all the alloys, except for the Ti[sbnd]11Nb[sbnd]7Fe, exhibit orthorhombic α“ and body-centred cubic β phases, while Ti[sbnd]11Nb[sbnd]7Fe alloy consists of only β phase. It is proposed that increasing the Nb content enhances β phase stability and its proportion in the microstructure of the designed alloys. Depending on the proportion of β and α” phases, Ti[sbnd]xNb[sbnd]7Fe alloys show varied hardness (3.57–5.92 GPa) and compressive strength (1990–2093 MPa). Additionally, they present wear rates in the range of 3 × 10− 15–1 × 10− 13 m3/m which correlates well with the changes in the corresponding microstructures and mechanical properties. Among the studied alloys, Ti[sbnd]11Nb[sbnd]7Fe with β phase microstructure, presents the lowest elastic modulus (86 GPa) and the highest compressive strain (41.5%) along with high compressive strength, hardness and wear resistance. Therefore, it is suggested that this β-type Ti[sbnd]11Nb[sbnd]7Fe alloy is a promising candidate, more suitable than the commercially used CP[sbnd]Ti and Ti[sbnd]6Al[sbnd]4V, for orthopedic applications

DOI

10.1016/j.matdes.2016.09.029

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