Swinburne
Browse

Insights into machining of a β titanium biomedical alloy from chip microstructures

Download (3.26 MB)
journal contribution
posted on 2024-07-11, 11:17 authored by Damon Kent, Rizwan Abdul Rahman RashidRizwan Abdul Rahman Rashid, Michael Bermingham, Hooyar Attar, Shoujin Sun, Matthew Dargusch
New metastable β titanium alloys are receiving increasing attention due to their excellent biomechanical properties and machinability is critical to their uptake. In this study, machining chip microstructure has been investigated to gain an understanding of strain and temperature fields during cutting. For higher cutting speeds, ≥60 m/min, the chips have segmented morphologies characterised by a serrated appearance. High levels of strain in the primary shear zone promote formation of expanded shear band regions between segments which exhibit intensive refinement of the β phase down to grain sizes below 100 nm. The presence of both α and β phases across the expanded shear band suggests that temperatures during cutting are in the range of 400–600◦ C. For the secondary shear zone, very large strains at the cutting interface result in heavily refined and approximately equiaxed nanocrystalline β grains with sizes around 20–50 nm, while further from the interface the β grains become highly elongated in the shear direction. An absence of the α phase in the region immediately adjacent to the cutting interface indicates recrystallization during cutting and temperatures in excess of the 720° C β transus temperature.

Funding

ARC Research Hub for Advanced Manufacturing of Medical Devices

Australian Research Council

Find out more...

History

Available versions

PDF (Published version)

ISSN

2075-4701

Journal title

Metals

Volume

8

Issue

9

Article number

article no. 710

Publisher

MDPI AG

Copyright statement

Copyright © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Language

eng

Usage metrics

    Publications

    Categories

    No categories selected

    Keywords

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC