Strengthening of low Young's modulus beta Ti-Nb-Sn alloys by thermomechanical processing

H. Matsumoto, S. Watanabe, S. Hanada

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

14 Citations (Scopus)

Abstract

Metastable β Ti-Nb-Sn alloys with low Young's modulus were heat treated after cold rolling to refine microstructures and thereby to strengthen the alloys without sacrificing the low Young's modulus. Alpha double prime (α") martensite with the orthorhombic structure is stress-induced by cold rolling and preferential rolling textures are evolved during a large rolling reduction. Rearrangement of martensite plates parallel to the rolling direction, which is associated with α" rolling texture, leads to a decrease in Young's modulus. Reverse martensitic transformation is almost completed upon heating to 523 K, resulting in very fine β grains elongated to the rolling direction. A high density of dislocations and fine α precipitates are included in the β grains. Low Young's modulus and high strength are simultaneously attained by controlling heat treatment processing parameters. A preliminary experiment showed that a round bar of β Ti-Nb-Sn alloy can be die-forged at room temperature into a stem-like shape for an artificial hip implant.

Original languageEnglish
Title of host publicationMedical Device Materials III - Proceedings of the Materials and Processes for Medical Devices Conference 2005
Pages9-14
Number of pages6
Publication statusPublished - 2006 Dec 1
EventMaterials and Processes for Medical Devices Conference 2005 - Boston, MA, United States
Duration: 2006 Nov 142006 Nov 16

Publication series

NameMedical Device Materials III - Proceedings of the Materials and Processes for Medical Devices Conference 2005
Volume2006

Other

OtherMaterials and Processes for Medical Devices Conference 2005
CountryUnited States
CityBoston, MA
Period06/11/1406/11/16

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Matsumoto, H., Watanabe, S., & Hanada, S. (2006). Strengthening of low Young's modulus beta Ti-Nb-Sn alloys by thermomechanical processing. In Medical Device Materials III - Proceedings of the Materials and Processes for Medical Devices Conference 2005 (pp. 9-14). (Medical Device Materials III - Proceedings of the Materials and Processes for Medical Devices Conference 2005; Vol. 2006).