Effects of selected metallic and interstitial elements on the microstructure and mechanical properties of beta titanium alloys for orthopedic applications

Weng, W, Biesiekierski, A, Li, Y and Wen, C 2019, 'Effects of selected metallic and interstitial elements on the microstructure and mechanical properties of beta titanium alloys for orthopedic applications', Materialia, vol. 6, pp. 1-12.


Document type: Journal Article
Collection: Journal Articles

Title Effects of selected metallic and interstitial elements on the microstructure and mechanical properties of beta titanium alloys for orthopedic applications
Author(s) Weng, W
Biesiekierski, A
Li, Y
Wen, C
Year 2019
Journal name Materialia
Volume number 6
Start page 1
End page 12
Total pages 12
Publisher Elsevier
Abstract Metallic biomaterials are widely used for orthopedic application to resolve pain and improve patients quality of life. Among these biomaterials, beta (β)phase titanium (Ti) alloys have received intense interest over last two decades. Unfortunately, the issue of insufficient mechanical properties of biocompatible β Ti alloys is still significant, including low tensile strength (UTS) and high Young's modulus (E), which causes the early failure of the implant and degradation of natural bone, respectively. Thus, this article reviews the effects of some commonly used alloying elements on UTS, E and microstructure of Ti alloys for orthopedic application. Niobium is highlighted as the optimum βstabilizer addition, with other elements such as tantalum and molybdenum also somewhat suitable. Tin and zirconium, although not βstabilizers, are also suggested for their effects on microstructure. Additionally, the effects of four interstitial elements have been discussed; oxygen and nitrogen are noted to show significant effects on microstructure and phase transformations in β alloys, and so are of interest in developing highstrength novel Ti alloys, though further research is needed. Carbon is less beneficial, but is not harmful if carbide formation is avoided. Hydrogen is solely detrimental, and should be limited as much as possible.
Subject Metals and Alloy Materials
Biomaterials
Keyword(s) Alloying
Mechanical properties
Microstructure
Orthopedic application
Titanium alloy
DOI - identifier 10.1016/j.mtla.2019.100323
Copyright notice © 2019 Materialia
ISSN 2589-1529
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