Microstructural evolution in a superelastic metastable beta-Ti alloy

James Coakley; Dieter Isheim; Anna Radecka; David Dye; Howard J. Stone; David N. Seidman

doi:10.1016/j.scriptamat.2016.09.035

Microstructural evolution in a superelastic metastable beta-Ti alloy

James Coakley^*, Dieter Isheim, Anna Radecka, David Dye, Howard J. Stone, David N. Seidman

^*Corresponding author for this work

Materials Science and Engineering

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

10 Scopus citations

Abstract

The microstructural evolution of Ti-24Nb-4Zr-8Sn wt.% during low-temperature ageing is examined by atom-probe tomography (APT) and X-ray diffraction (XRD). This ageing is deleterious to the desirable mechanical properties, such as ultra-low elastic modulus and superelasticity. Initially, the cold-rolled alloy possesses a martensitic α^′′-precipitate/β-matrix microstructure. On ageing, Ti-rich/solute-lean precipitates grow in linear arrangements, which are likely associated with dislocations. Additionally, the composition and number density of Nb-rich domains (which are associated with superelasticity) are quantified for the first time. The domains are unstable, but decrease in number density during ageing, causing the deterioration in mechanical properties.

Original language	English (US)
Pages (from-to)	87-90
Number of pages	4
Journal	Scripta Materialia
Volume	128
DOIs	https://doi.org/10.1016/j.scriptamat.2016.09.035
State	Published - Feb 1 2017

Keywords

Ageing
Atom-probe tomography
Martensitic phase transformation
Precipitation
Titanium alloys

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2016.09.035

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title = "Microstructural evolution in a superelastic metastable beta-Ti alloy",

abstract = "The microstructural evolution of Ti-24Nb-4Zr-8Sn wt.% during low-temperature ageing is examined by atom-probe tomography (APT) and X-ray diffraction (XRD). This ageing is deleterious to the desirable mechanical properties, such as ultra-low elastic modulus and superelasticity. Initially, the cold-rolled alloy possesses a martensitic α′′-precipitate/β-matrix microstructure. On ageing, Ti-rich/solute-lean precipitates grow in linear arrangements, which are likely associated with dislocations. Additionally, the composition and number density of Nb-rich domains (which are associated with superelasticity) are quantified for the first time. The domains are unstable, but decrease in number density during ageing, causing the deterioration in mechanical properties.",

keywords = "Ageing, Atom-probe tomography, Martensitic phase transformation, Precipitation, Titanium alloys",

author = "James Coakley and Dieter Isheim and Anna Radecka and David Dye and Stone, {Howard J.} and Seidman, {David N.}",

note = "Funding Information: JC acknowledges support from the European Union Seventh Framework Programme under the Marie Curie grant agreement number 628643 . The authors would like to thank Rui Yang for sample preparation. This work made use of the J.B. Cohen X-ray Diffraction Facility at the Materials Research Center of Northwestern University supported by the National Science Foundations MRSEC program (DMR-1121262). Atom-probe tomography measurements were performed under the same program and grant at the Northwestern University Center for Atom-Probe Tomography (NUCAPT) Shared Facility. The LEAP tomograph was purchased and upgraded with funding from the NSF-MRI (DMR 0420532) and ONR DURIP (N00014-0400798, N00014- 0610539, N00014-0910781) programs. We are also grateful to the Initiative for Sustainability and Energy at Northwestern (ISEN) for grants to upgrade NUCAPTs capabilities. Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd",

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doi = "10.1016/j.scriptamat.2016.09.035",

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pages = "87--90",

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AU - Coakley, James

AU - Isheim, Dieter

AU - Radecka, Anna

AU - Dye, David

AU - Stone, Howard J.

AU - Seidman, David N.

N1 - Funding Information: JC acknowledges support from the European Union Seventh Framework Programme under the Marie Curie grant agreement number 628643 . The authors would like to thank Rui Yang for sample preparation. This work made use of the J.B. Cohen X-ray Diffraction Facility at the Materials Research Center of Northwestern University supported by the National Science Foundations MRSEC program (DMR-1121262). Atom-probe tomography measurements were performed under the same program and grant at the Northwestern University Center for Atom-Probe Tomography (NUCAPT) Shared Facility. The LEAP tomograph was purchased and upgraded with funding from the NSF-MRI (DMR 0420532) and ONR DURIP (N00014-0400798, N00014- 0610539, N00014-0910781) programs. We are also grateful to the Initiative for Sustainability and Energy at Northwestern (ISEN) for grants to upgrade NUCAPTs capabilities. Publisher Copyright: © 2016 Elsevier Ltd

PY - 2017/2/1

Y1 - 2017/2/1

N2 - The microstructural evolution of Ti-24Nb-4Zr-8Sn wt.% during low-temperature ageing is examined by atom-probe tomography (APT) and X-ray diffraction (XRD). This ageing is deleterious to the desirable mechanical properties, such as ultra-low elastic modulus and superelasticity. Initially, the cold-rolled alloy possesses a martensitic α′′-precipitate/β-matrix microstructure. On ageing, Ti-rich/solute-lean precipitates grow in linear arrangements, which are likely associated with dislocations. Additionally, the composition and number density of Nb-rich domains (which are associated with superelasticity) are quantified for the first time. The domains are unstable, but decrease in number density during ageing, causing the deterioration in mechanical properties.

AB - The microstructural evolution of Ti-24Nb-4Zr-8Sn wt.% during low-temperature ageing is examined by atom-probe tomography (APT) and X-ray diffraction (XRD). This ageing is deleterious to the desirable mechanical properties, such as ultra-low elastic modulus and superelasticity. Initially, the cold-rolled alloy possesses a martensitic α′′-precipitate/β-matrix microstructure. On ageing, Ti-rich/solute-lean precipitates grow in linear arrangements, which are likely associated with dislocations. Additionally, the composition and number density of Nb-rich domains (which are associated with superelasticity) are quantified for the first time. The domains are unstable, but decrease in number density during ageing, causing the deterioration in mechanical properties.

KW - Ageing

KW - Atom-probe tomography

KW - Martensitic phase transformation

KW - Precipitation

KW - Titanium alloys

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JO - Scripta Materialia

JF - Scripta Materialia

ER -

Microstructural evolution in a superelastic metastable beta-Ti alloy

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