Laser Shock Peening of Orthopaedic Ti-6Al-7Nb: Evaluation of Topography, Wetting Characteristics, Microstructure and Residual Stress

Research output: Contribution to journalArticle

Abstract

This paper is focused on a study of wetting characteristics post laser shock peening (LSP) of orthopaedic titanium alloy (Ti-6Al-7Nb) for the first-time. A 10J, 8ns, 1064nm wavelength, Nd:YAG Laser was employed. Residual stress was measured using the incremental hole drilling method. Residual stress results showed maximum compressive stress of -420 MPa, and -100 MPa at a depth of 0.8mm. The surface roughness was increased from 0.15 μm to 0.87 μm after multiple LSP impacts. The contact angle measurements were undertaken by using a sessile drop device with water and ethylene glycol. Both liquids showed that LSP increase the contact angle by 17% and 30.4% respectively using water and ethylene glycol. In addition, further verification was made using the Fowkes model to calculate the surface energy. This yielded the total energy, diversion and polar component to have reduced. The increased contact angle of LSPned samples were affected by combination of increased surface roughness and decreased surface energy. The findings in this study not only form a base for further research, but also reveal the possibility of strengthening titanium implants and rendering them to become more biocompatible.
Original languageEnglish
Pages (from-to)137-154
Number of pages17
JournalInternational Journal of Peening Science & Technology
Volume1
Issue number2
Early online date30 Nov 2018
Publication statusPublished - 15 Jan 2019

Fingerprint

Shot peening
Orthopedics
Topography
Wetting
Residual stresses
Contact angle
Microstructure
Ethylene Glycol
Lasers
Ethylene glycol
Interfacial energy
Surface roughness
Water
Strengthening (metal)
Angle measurement
Titanium
Compressive stress
Titanium alloys
Drilling
Wavelength

Bibliographical note

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

  • LSP
  • Wettability
  • contact angle
  • Ti-674-Nb
  • Residual stress
  • SEM
  • 3-D profiling

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

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title = "Laser Shock Peening of Orthopaedic Ti-6Al-7Nb: Evaluation of Topography, Wetting Characteristics, Microstructure and Residual Stress",
abstract = "This paper is focused on a study of wetting characteristics post laser shock peening (LSP) of orthopaedic titanium alloy (Ti-6Al-7Nb) for the first-time. A 10J, 8ns, 1064nm wavelength, Nd:YAG Laser was employed. Residual stress was measured using the incremental hole drilling method. Residual stress results showed maximum compressive stress of -420 MPa, and -100 MPa at a depth of 0.8mm. The surface roughness was increased from 0.15 μm to 0.87 μm after multiple LSP impacts. The contact angle measurements were undertaken by using a sessile drop device with water and ethylene glycol. Both liquids showed that LSP increase the contact angle by 17{\%} and 30.4{\%} respectively using water and ethylene glycol. In addition, further verification was made using the Fowkes model to calculate the surface energy. This yielded the total energy, diversion and polar component to have reduced. The increased contact angle of LSPned samples were affected by combination of increased surface roughness and decreased surface energy. The findings in this study not only form a base for further research, but also reveal the possibility of strengthening titanium implants and rendering them to become more biocompatible.",
keywords = "LSP, Wettability, contact angle, Ti-674-Nb, Residual stress, SEM, 3-D profiling",
author = "Xiaojun Shen and Pratik Shukla and Feng Yao and Subhasisa Nath and Zhibin An and Jonathan Lawrence",
note = "Copyright {\circledC} and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.",
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T1 - Laser Shock Peening of Orthopaedic Ti-6Al-7Nb: Evaluation of Topography, Wetting Characteristics, Microstructure and Residual Stress

AU - Shen, Xiaojun

AU - Shukla, Pratik

AU - Yao, Feng

AU - Nath, Subhasisa

AU - An, Zhibin

AU - Lawrence, Jonathan

N1 - Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

PY - 2019/1/15

Y1 - 2019/1/15

N2 - This paper is focused on a study of wetting characteristics post laser shock peening (LSP) of orthopaedic titanium alloy (Ti-6Al-7Nb) for the first-time. A 10J, 8ns, 1064nm wavelength, Nd:YAG Laser was employed. Residual stress was measured using the incremental hole drilling method. Residual stress results showed maximum compressive stress of -420 MPa, and -100 MPa at a depth of 0.8mm. The surface roughness was increased from 0.15 μm to 0.87 μm after multiple LSP impacts. The contact angle measurements were undertaken by using a sessile drop device with water and ethylene glycol. Both liquids showed that LSP increase the contact angle by 17% and 30.4% respectively using water and ethylene glycol. In addition, further verification was made using the Fowkes model to calculate the surface energy. This yielded the total energy, diversion and polar component to have reduced. The increased contact angle of LSPned samples were affected by combination of increased surface roughness and decreased surface energy. The findings in this study not only form a base for further research, but also reveal the possibility of strengthening titanium implants and rendering them to become more biocompatible.

AB - This paper is focused on a study of wetting characteristics post laser shock peening (LSP) of orthopaedic titanium alloy (Ti-6Al-7Nb) for the first-time. A 10J, 8ns, 1064nm wavelength, Nd:YAG Laser was employed. Residual stress was measured using the incremental hole drilling method. Residual stress results showed maximum compressive stress of -420 MPa, and -100 MPa at a depth of 0.8mm. The surface roughness was increased from 0.15 μm to 0.87 μm after multiple LSP impacts. The contact angle measurements were undertaken by using a sessile drop device with water and ethylene glycol. Both liquids showed that LSP increase the contact angle by 17% and 30.4% respectively using water and ethylene glycol. In addition, further verification was made using the Fowkes model to calculate the surface energy. This yielded the total energy, diversion and polar component to have reduced. The increased contact angle of LSPned samples were affected by combination of increased surface roughness and decreased surface energy. The findings in this study not only form a base for further research, but also reveal the possibility of strengthening titanium implants and rendering them to become more biocompatible.

KW - LSP

KW - Wettability

KW - contact angle

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KW - Residual stress

KW - SEM

KW - 3-D profiling

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