Mechanical properties-graded Ti alloy implants for orthopedic applications

T. K. Jung, H. Matsumoto, T. Abumiya, N. Masahashi, M. S. Kim, S. Hanada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

21 Citations (Scopus)

Abstract

Low Young's modulus is attained by controlling phase stability of β (bcc) Ti-Nb-Sn alloys consisting of non-cytotoxic elements, based on experimental results that Young's modulus decreases with decreasing temperature toward α" (orthorhombic) martensitic transformation start temperature (Ms). Cold groove rolled, metastable β (Ti-35%Nb)-4%Sn alloy exhibits low Young's modulus of about 40 GPa at 297 K, measured by the free resonance vibration method. This value is much lower than that of Ti-6%Al-4%V and close to that of human cortical bone. By heating one edge of the groove rolled rod to 573 K for 4 h, hardness and Young's modulus are found to increase significantly at the heated zone and to change depending on distance from the heated zone. The increase in hardness is explained mainly by fine α precipitation and additionally by microstructure refinement through reverse transformation α"→β of deformation-induced martensite. From these results, an advanced stem having high strength at the necked part can be developed for a new artificial hip joint, keeping low Young's modulus at the distal part implanted in a femur.

Original languageEnglish
Title of host publicationMultiscale, Multifunctional and Functionally Graded Materials
PublisherTrans Tech Publications Ltd
Pages205-210
Number of pages6
ISBN (Print)0878493077, 9780878493074
DOIs
Publication statusPublished - 2010
Externally publishedYes
Event10th International Symposium on Multiscale, Multifunctional and Functionally Graded Materials, MM and FGMs - Sendai, Japan
Duration: 2008 Sep 222008 Sep 25

Publication series

NameMaterials Science Forum
Volume631-632
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other10th International Symposium on Multiscale, Multifunctional and Functionally Graded Materials, MM and FGMs
CountryJapan
CitySendai
Period08/9/2208/9/25

Keywords

  • Hardness
  • Implant
  • Mechanical property
  • Stem
  • Ti alloy
  • Young's modulus

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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