Porosity and tensile properties of rhizoid porous structure fabricated using selective laser melting

Shinji Ishibashi, Keita Shimada, Hiroyasu Kanetaka, Masaki Tsukuda, Takumi Mizoi, Masataka Chuzenji, Shoichi Kikuchi, Masayoshi Mizutani, Tsunemoto Kuriyagawa

Research output: Contribution to journalArticlepeer-review

Abstract

The reduced density of the autogenous bone around metal medical implants forces joint replacement pa-tients to undergo revision surgery. The loss of bone density is caused by a significant difference in the elastic modulus between implants and autogenous bone. Various studies have attempted to reduce the elastic modulus of the implant to close the large gap in the two moduli. Porous metal is a promising material for reducing the elastic modulus of implants, but it is dif-ficult to fabricate a closed-cell structure like bone using conventional porous metal fabrication methods. In this study, porous Ti-6Al-4V was prepared by selective laser melting, then its porosity was evaluated by X-ray computed tomography. Additionally, tensile test specimens of the porous structure were prepared and the effect of pores on the tensile properties was evaluated. Depending on the energy density, the structure of the porous body was found to form both closed-and open-cell structures. In the tensile specimens that showed the most favorable results, the elastic modulus was reduced by approximately 90%, and the tensile strength exceeded that of the annealed material. This indicates that a metal implant that has a low elastic modulus while maintaining strength can be obtained.

Original languageEnglish
Pages (from-to)582-591
Number of pages10
JournalInternational Journal of Automation Technology
Volume14
Issue number4
DOIs
Publication statusPublished - 2020

Keywords

  • Porous metal
  • Selective laser melting
  • Tensile strength
  • Ti-6Al-4V
  • X-ray computed tomography

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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