Mechanics of superelasticity in Ti-30Nb-(8-10)Ta-5Zr alloy

E. G. Obbard; Y. L. Hao; T. Akahori; R. J. Talling; M. Niinomi; D. Dye; R. Yang

doi:10.1016/j.actamat.2010.02.010

Mechanics of superelasticity in Ti-30Nb-(8-10)Ta-5Zr alloy

E. G. Obbard, Y. L. Hao, T. Akahori, R. J. Talling, M. Niinomi, D. Dye, R. Yang

Materials Development Division

Research output: Contribution to journal › Article › peer-review

46 Citations (Scopus)

Abstract

The superelastic behaviour of Ti-30Nb-10Ta-5Zr and Ti-30Nb-8Ta-5Zr (wt.%) biomedical alloys was investigated by tensile testing and in situ synchrotron X-ray diffraction. The phenomenological theory of martensite crystallography and texture prediction based on the Schmid law indicate that α^″ in Ti-30Nb-10Ta-5Zr forms in untwinned variants. Measurement of single-crystal elastic constants using an Eshelby-Kroener-Kneer self-consistent model shows that the 10-Ta alloy has a C^′ modulus 3 GPa higher than that of the 8-Ta alloy. That it nevertheless has a proof stress 35 MPa lower can be qualitatively explained by the differences in martensite crystallography. The results suggest that high tensile strength can be maintained for low modulus β -Ti in spite of martensitic transformation by optimizing transformation strains.

Original language	English
Pages (from-to)	3557-3567
Number of pages	11
Journal	Acta Materialia
Volume	58
Issue number	10
DOIs	https://doi.org/10.1016/j.actamat.2010.02.010
Publication status	Published - 2010 Jun

Keywords

Martensitic phase transformation
Shape memory alloys
Synchrotron radiation
Titanium alloys
X-ray diffraction

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2010.02.010

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title = "Mechanics of superelasticity in Ti-30Nb-(8-10)Ta-5Zr alloy",

abstract = "The superelastic behaviour of Ti-30Nb-10Ta-5Zr and Ti-30Nb-8Ta-5Zr (wt.%) biomedical alloys was investigated by tensile testing and in situ synchrotron X-ray diffraction. The phenomenological theory of martensite crystallography and texture prediction based on the Schmid law indicate that α″ in Ti-30Nb-10Ta-5Zr forms in untwinned variants. Measurement of single-crystal elastic constants using an Eshelby-Kroener-Kneer self-consistent model shows that the 10-Ta alloy has a C′ modulus 3 GPa higher than that of the 8-Ta alloy. That it nevertheless has a proof stress 35 MPa lower can be qualitatively explained by the differences in martensite crystallography. The results suggest that high tensile strength can be maintained for low modulus β -Ti in spite of martensitic transformation by optimizing transformation strains.",

keywords = "Martensitic phase transformation, Shape memory alloys, Synchrotron radiation, Titanium alloys, X-ray diffraction",

author = "Obbard, {E. G.} and Hao, {Y. L.} and T. Akahori and Talling, {R. J.} and M. Niinomi and D. Dye and R. Yang",

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AU - Obbard, E. G.

AU - Hao, Y. L.

AU - Akahori, T.

AU - Talling, R. J.

AU - Niinomi, M.

AU - Dye, D.

AU - Yang, R.

PY - 2010/6

Y1 - 2010/6

N2 - The superelastic behaviour of Ti-30Nb-10Ta-5Zr and Ti-30Nb-8Ta-5Zr (wt.%) biomedical alloys was investigated by tensile testing and in situ synchrotron X-ray diffraction. The phenomenological theory of martensite crystallography and texture prediction based on the Schmid law indicate that α″ in Ti-30Nb-10Ta-5Zr forms in untwinned variants. Measurement of single-crystal elastic constants using an Eshelby-Kroener-Kneer self-consistent model shows that the 10-Ta alloy has a C′ modulus 3 GPa higher than that of the 8-Ta alloy. That it nevertheless has a proof stress 35 MPa lower can be qualitatively explained by the differences in martensite crystallography. The results suggest that high tensile strength can be maintained for low modulus β -Ti in spite of martensitic transformation by optimizing transformation strains.

AB - The superelastic behaviour of Ti-30Nb-10Ta-5Zr and Ti-30Nb-8Ta-5Zr (wt.%) biomedical alloys was investigated by tensile testing and in situ synchrotron X-ray diffraction. The phenomenological theory of martensite crystallography and texture prediction based on the Schmid law indicate that α″ in Ti-30Nb-10Ta-5Zr forms in untwinned variants. Measurement of single-crystal elastic constants using an Eshelby-Kroener-Kneer self-consistent model shows that the 10-Ta alloy has a C′ modulus 3 GPa higher than that of the 8-Ta alloy. That it nevertheless has a proof stress 35 MPa lower can be qualitatively explained by the differences in martensite crystallography. The results suggest that high tensile strength can be maintained for low modulus β -Ti in spite of martensitic transformation by optimizing transformation strains.

KW - Martensitic phase transformation

KW - Shape memory alloys

KW - Synchrotron radiation

KW - Titanium alloys

KW - X-ray diffraction

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Mechanics of superelasticity in Ti-30Nb-(8-10)Ta-5Zr alloy

Abstract

Keywords

ASJC Scopus subject areas

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