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The effect of energy density and Nb content on the microstructure and mechanical properties of selective laser melted Ti-(10-30 wt.%)Nb

In this study Ti-(0-30 wt.%)Nb alloys developed from elemental powders were fabricated by the Selective Laser Melting (SLM) process. Compositional homogeneity, microstructure and mechanical performance were investigated as a function of energy density. The proportion of un-melted Nb particles and isolated pore count reduced with increasing energy density, while Ti allotropic content (i.e. α’, α” and β) varied with energy density due to in-situ alloying. Increasing the Nb content led to the stabilisation of the α” and β phases. The mechanical properties were similar to those compositions manufactured using casting methods without further post processing. The addition of 20Nb (wt.%) and using an energy density of 230 J/mm3 resulted in a Young’s Modulus of 65.2 ± 1.8 GPa, a yield strength of 769 ± 36 MPa and a microstructure of predominantly α” martensite. This strength to stiffness ratio (33% higher than Ti-10Nb and 22% higher than Ti-30Nb) is attributed to in-situ alloying that promotes solid solution strengthening and homogenisation. These alloys are strong contenders as materials suitable for implantable load-bearing orthopaedic applications.

Funding

Embedded Integrated Intelligent Systems for Manufacturing

Engineering and Physical Sciences Research Council

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History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of Materials Engineering and Performance

Publisher

Springer

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Journal of Materials Engineering and Performance and the definitive published version is available at [insert DOI link].

Acceptance date

03/09/2021

ISSN

1059-9495

eISSN

1544-1024

Language

en

Depositor

Dr Carmen Torres-Sanchez. Deposit date: 3 September 2021

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