Gradation of mechanical properties by local heating in beta TiNbSn alloy

Shuji Hanada, Taek Kyun Jung, Naoya Masahashi, Norikazu Yamada, Tadashi Hasegawa, Yoshio Asano, Tomoo Kobayashi

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

1 Citation (Scopus)

Abstract

In the development of high performance artificial hip prostheses low Young's modulus for suppressing stress shielding and high strength for both enduring several times the patient's body weight and avoiding dislocation arising from impingement are simultaneously required for a stem. However, a trade-off is known between low Young's modulus and high strength in many alloys. Recently, we have proposed a new concept for stem fabrication that low Young's modulus is given in a distal part by cold working and high strength in a proximal part by local heating after cold working. In order to obtain fundamental information on gradation of temperature and mechanical properties a cold swaged β Ti-33. 6wt% Nb-4wt%Sn rod with 9mm in diameter and 100 mm in length was locally heated at one edge. Temperature distribution on and in the rod was measured by thermography and thermocouples, respectively, as a function of distance from the other edge. Young's modulus and tensile properties were measured using swaged rod samples subjected to various heat treatments, referring to temperature distribution in local heating. It is found that sharp temperature gradation can be obtained from the heated edge toward the other edge because of low thermal conductivity of the alloy, and correspondingly mechanical properties are graded.

Original languageEnglish
Title of host publicationTi 2011 - Proceedings of the 12th World Conference on Titanium
Pages2098-2101
Number of pages4
Publication statusPublished - 2012
Event12th World Conference on Titanium, Ti 2011 - Beijing, China
Duration: 2011 Jun 192011 Jun 24

Publication series

NameTi 2011 - Proceedings of the 12th World Conference on Titanium
Volume3

Other

Other12th World Conference on Titanium, Ti 2011
CountryChina
CityBeijing
Period11/6/1911/6/24

Keywords

  • Biomaterials
  • Body centered cubic (bcc)
  • Gradation
  • Tensile strength
  • Titanium (Ti)
  • Young's modulus

ASJC Scopus subject areas

  • Ceramics and Composites

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  • Cite this

    Hanada, S., Jung, T. K., Masahashi, N., Yamada, N., Hasegawa, T., Asano, Y., & Kobayashi, T. (2012). Gradation of mechanical properties by local heating in beta TiNbSn alloy. In Ti 2011 - Proceedings of the 12th World Conference on Titanium (pp. 2098-2101). (Ti 2011 - Proceedings of the 12th World Conference on Titanium; Vol. 3).