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

Research output: Contribution to journalArticle

6 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)87-90
Number of pages4
JournalScripta Materialia
Volume128
DOIs
StatePublished - Feb 1 2017

Fingerprint

Microstructural evolution
Aging of materials
Precipitates
precipitates
mechanical properties
Mechanical properties
deterioration
Tomography
Deterioration
modulus of elasticity
solutes
tomography
Elastic moduli
X ray diffraction
Atoms
microstructure
Microstructure
probes
matrices
Chemical analysis

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

Cite this

Coakley, James ; Isheim, Dieter ; Radecka, Anna ; Dye, David ; Stone, Howard J. ; Seidman, David N. / Microstructural evolution in a superelastic metastable beta-Ti alloy. In: Scripta Materialia. 2017 ; Vol. 128. pp. 87-90.
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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.",
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Microstructural evolution in a superelastic metastable beta-Ti alloy. / Coakley, James; Isheim, Dieter; Radecka, Anna; Dye, David; Stone, Howard J.; Seidman, David N.

In: Scripta Materialia, Vol. 128, 01.02.2017, p. 87-90.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microstructural evolution in a superelastic metastable beta-Ti alloy

AU - Coakley, James

AU - Isheim, Dieter

AU - Radecka, Anna

AU - Dye, David

AU - Stone, Howard J.

AU - Seidman, David N

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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.

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KW - Atom-probe tomography

KW - Martensitic phase transformation

KW - Precipitation

KW - Titanium alloys

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