A mechanical comparison of alpha and beta phase biomedical TiTa lattice structures

Erin G. Brodie; Thomas Wegener; Julia Richter; Alexander Medvedev; Thomas Niendorf; Andrey Molotnikov

Materials & Design (Dec 2021)

A mechanical comparison of alpha and beta phase biomedical TiTa lattice structures

Erin G. Brodie,
Thomas Wegener,
Julia Richter,
Alexander Medvedev,
Thomas Niendorf,
Andrey Molotnikov

Affiliations

Erin G. Brodie: Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia; Monash Centre for Additive Manufacturing (MCAM), 11 Normanby Road, Nottinghill, VIC 3168, Australia; Corresponding authors at: Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia.
Thomas Wegener: University of Kassel, Institute of Materials Engineering – Metallic Materials, Moenchebergstrasse 3, 34125 Kassel, Germany
Julia Richter: University of Kassel, Institute of Materials Engineering – Metallic Materials, Moenchebergstrasse 3, 34125 Kassel, Germany
Alexander Medvedev: RMIT Centre for Additive Manufacturing, School of Engineering, RMIT University, Melbourne, Australia
Thomas Niendorf: University of Kassel, Institute of Materials Engineering – Metallic Materials, Moenchebergstrasse 3, 34125 Kassel, Germany
Andrey Molotnikov: Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia; Monash Centre for Additive Manufacturing (MCAM), 11 Normanby Road, Nottinghill, VIC 3168, Australia; RMIT Centre for Additive Manufacturing, School of Engineering, RMIT University, Melbourne, Australia; Corresponding authors at: Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia.

Journal volume & issue: Vol. 212
p. 110220

Abstract

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Recent orthopaedic implant alloy design has focused on β-type Ti alloys, as the body centred cubic (BCC) crystal structure has the tendency to be characterised by a low elastic modulus. Nevertheless, the currently most used metal is Ti-6Al-4V, which mainly retains a hexagonal closed packed (HCP) crystal structure when produced by additive manufacturing. The benefits and disadvantages of the mechanical response of each crystal structure for implant applications is yet to be explored. Utilising the TiTa alloy system, low modulus Ti25Ta and Ti65Ta lattices were additively manufactured with opposing crystal structures of α′ martensite (HCP) and β grains (BCC). The lattices showed similar tensile, compressive and high cycle fatigue behaviour, indicating that the α' alloy was mechanically equal to the β alloy for implant applications. The mechanical properties of both the TiTa lattices were also superior to identically manufactured lattices in Ti-6Al-4V in both as-built and heat treated conditions.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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