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IJAT Vol.11 No.6 pp. 915-924
doi: 10.20965/ijat.2017.p0915
(2017)

Paper:

Formation of Hydroxyapatite Layer on Ti–6Al–4V ELI Alloy by Fine Particle Peening

Shoichi Kikuchi*1,†, Yuki Nakamura*2, Koichiro Nambu*3, and Toshikazu Akahori*4

*1Department of Mechanical Engineering, Graduate School of Engineering, Kobe University
1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan

Corresponding author

*2Department of Mechanical Engineering, National Institute of Technology, Toyota College, Toyota, Japan

*3Toyota Technological Institute, Nagoya, Japan

*4Department of Materials Science and Engineering, Faculty of Science and Technology, Meijo University, Nagoya, Japan

Received:
January 16, 2017
Accepted:
May 11, 2017
Online released:
October 31, 2017
Published:
November 5, 2017
Keywords:
fine particle peening, titanium alloy, hydroxyapatite, fatigue, biomaterial
Abstract

Fine particle peening (FPP) using hydroxyapatite (HAp) shot particles can form a HAp layer on room-temperature substrates by the transfer and microstructural modification of the shot particles. In this study, FPP with HAp shot particles was applied to form a HAp surface layer and improve the fatigue properties of Ti–6Al–4V extra-low interstitial (ELI) for use in bio-implants. The surface microstructures of the FPP-treated specimens were characterized by micro-Vickers hardness testing, scanning electron microscopy, energy-dispersive X-ray spectrometry, X-ray diffraction, and X-ray photoelectron spectroscopy. FPP with HAp shot particles successfully formed a HAp layer on the surface of Ti–6Al–4V ELI in a relatively short period by shot particle transfer at room temperature; however, the thickness and elemental composition of the HAp layer were independent of the FPP treatment time. The original HAp crystal structure remained in the surface-modified layer formed on Ti–6Al–4V ELI after FPP. Furthermore, FPP increased the surface hardness and generated compressive residual stresses at the treated surface of Ti–6Al–4V ELI. Four-point bending fatigue tests were performed at stress ratios of 0.1 and 0.5 to examine the effect of FPP with HAp shot particles on the fatigue properties of Ti–6Al–4V ELI. The fatigue life of the FPP-treated specimen was longer than that of the un-peened specimen because of the formation of a work-hardened layer with compressive residual stress. However, no clear improvement in the fatigue limit of Ti–6Al–4V ELI occurred after FPP with HAp shot particles because of subsurface failures from characteristic facets.

Cite this article as:
S. Kikuchi, Y. Nakamura, K. Nambu, and T. Akahori, “Formation of Hydroxyapatite Layer on Ti–6Al–4V ELI Alloy by Fine Particle Peening,” Int. J. Automation Technol., Vol.11, No.6, pp. 915-924, 2017.
Data files:
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