Mechanical properties and frictional wear characteristics of biomedical Zr-20 mass%Nb alloy subjected to surface hardening treatment

Toshikazu Akahori, Mitsuo Niinomi, Masaaki Nakai, Harumi Tsutsumi, Yusuke Kondo, Tomokazu Hattori, Hisao Fukui

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The frictional wear characteristics, mechanical properties, and biocompatibilities of biomedical Zr-20 mass%Nb alloy (Zr20Nb) subjected to solution treatment (ST) and air-oxidizing process (AOP) were investigated. Vickers hardness of the specimen surface of Zr-20Nb subjected to AOP at 973 K, 1073 K, and 1123 K are approximately 4.5 times larger than that of Zr-20Nb subjected to ST. Young's modulus of Zr-20Nb subjected to AOP increases with increasing AOP temperature up to 1073 K. 0.2% proof stress, tensile strength, and elongation of Zr-20Nb subjected to each AOP decrease proportionally with increasing AOP temperature, and is inferior to those of Zr-20Nb subjected to ST because of the growth of oxide layer with a large amount of micro-cracks and the diffusion of oxygen into the subsurface. Frictional wear loss of Zr-20Nb subjected to each AOP decreases drastically as compared to that of Zr-20Nb subjected to ST. Bone-compatibility of Zr-20Nb subjected to AOP at 973 K is better than that of AOP at 1073 K because of the existence of some cracks and partial exfoliation of oxide layer.

Original languageEnglish
Pages (from-to)452-459
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume75
Issue number8
DOIs
Publication statusPublished - 2011 Aug 1

Keywords

  • Air-oxidizing
  • Beta-type zirconium alloy
  • Bonecompatibility
  • Metallic biomaterial
  • Microstructure
  • Surface modification
  • Tensile properties

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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