On the mechanism of superelasticity in Gum metal

Talling, R.J.; Dashwood, R. J.; Jackson, M.; Dye, David

doi:10.1016/j.actamat.2008.11.013

Cited by 208 publications

(150 citation statements)

References 45 publications

(95 reference statements)

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“…An increase in the intensity of the ½ phase in metastable ¢-type Ti alloys after deformation has been observed by other researchers. 1,2,16,17) These findings confirm that deformation-induced ½ phase transformation occurs in all Ti(1822)V alloys during cold rolling. The orientation relationships between the deformation-induced ½ phase and ¢ matrix are { 111} ¢ // {0001} ½ and h110i ¢ == h11 20i ½ , which are the same as the orientation relationships between the athermal ½ phase and ¢ matrix.…”

Section: Microstructuressupporting

confidence: 75%

“…1,2) It would appear that the deformation-induced products are related to the amount of ¢ stabilizing element that is present, i.e., the stability of the ¢ phase. As the amount of ¢ stabilizer increases, the stability of the ¢ phase increases so that such products change from deformation-induced martensites (¡A and ¡AA) to a deformation-induced ½ phase and mechanical twin.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Deformation-Induced ω Phase on the Mechanical Properties of Metastable β-Type Ti–V Alloys

et al. 2012

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A series of metastable ¢-type binary Ti(1822)V alloys were prepared to investigate the effect of deformation-induced products (deformation-induced ½ phase transformation and mechanical twinning) on the mechanical properties of metastable ¢-type titanium alloys. The microstructures, Young's moduli, and tensile properties of the alloys were systemically examined.Ti(1820)V alloys subjected to solution treatment comprise a ¢ phase and a small amount of athermal ½ phase, while Ti22V alloy subjected to solution treatment consists of a single ¢ phase. Ti(1820)V alloys subjected to solution treatment exhibit relatively low Young's moduli and low tensile strengths as compared to cold-rolled specimens. Both deformation-induced ½ phase transformation and {332} ¢ h113i ¢ mechanical twinning occur in all of the alloys during cold rolling. The occurrences of {332} ¢ h113i ¢ mechanical twinning and deformationinduced ½ phase transformation are dependent on the ¢ stability of the alloys. After cold rolling, all of the alloys comprise a ¢ phase and an ½ phase. The Young's moduli of Ti(1822)V alloys increase because of the formation of a deformation-induced ½ phase during cold rolling. The significant increase in tensile strength is attributed to the combined effect of the deformation-induced ½ phase transformation and workhardening during cold rolling.

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Section: Microstructuressupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Effect of Deformation-Induced ω Phase on the Mechanical Properties of Metastable β-Type Ti–V Alloys

et al. 2012

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“…2: (1) The transverse mode close to (but not exactly at) q = 3 . The atomic displacements along the ppp direction by this phonon mode result in two of the three neighboring (111) planes moving toward each other, whereas every third plane remains at rest.…”

Section: Discussionmentioning

confidence: 99%

Phonons and phase stability in Ti-V approximants to gum metal

et al. 2012

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The stability of competing phases within body-centered-cubic (bcc) Ti-V approximants to Gum Metal is considered from the perspective of the phonon dispersion. Phonons are associated with the potential to form the ω and α ′′ phases. It is argued that alloys can be designed to be linearly stable with respect to the formation of both phases, even as the ideal shear strength approaches zero. The reduction in ideal strength is associated with softening of the phonons along Γ − N , and is reflected in diffuse scattering diffraction experiments.

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“…In particular, the large non-linear recoverable deformation of Gum Metal has been a focal point of several investigations. The unconventional deformation mechanisms responsible for this peculiar behavior have been intensively studied [2][3][4][5][6][7][8][9][10]. Recent articles suggest that activity of phase transformations is of key importance for the nonlinear superelastic-like deformation of Gum Metal.…”

Section: Introductionmentioning

confidence: 99%

Gum Metal under cyclic tension inspected by a fast and sensitive infrared camera

Golasiński¹,

Pieczyska²,

Maj³

et al. 2018

Proceedings of the 2018 International Conference on Quantitative InfraRed Thermography

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This work presents results of experimental investigation of recoverable deformation of a β-Ti alloy Gum Metal inspected by infrared (IR) thermography. To this end, a flat specimen of Gum Metal was subjected to cyclic tension with an increasing strain on a testing machine and was simultaneously monitored by a fast and sensitive IR camera. The IR measurements determined an average temperature accompanying the alloy deformation process for subsequent tension cycles and allowed to estimate thermoelastic effect, which is related to the alloy yield point. Thermomechanical couplings accompanying the loading-unloading cycles were analyzed for estimating the range of reversible deformation from mechanical and thermal perspectives as well as discussed in the view of Lord Kelvin's formula.

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On the mechanism of superelasticity in Gum metal

Cited by 208 publications

References 45 publications

Effect of Deformation-Induced ω Phase on the Mechanical Properties of Metastable β-Type Ti–V Alloys

Effect of Deformation-Induced ω Phase on the Mechanical Properties of Metastable β-Type Ti–V Alloys

Phonons and phase stability in Ti-V approximants to gum metal

Gum Metal under cyclic tension inspected by a fast and sensitive infrared camera

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On the mechanism of superelasticity in Gum metal

Cited by 208 publications

References 45 publications

Effect of Deformation-Induced &omega; Phase on the Mechanical Properties of Metastable &beta;-Type Ti&ndash;V Alloys

Effect of Deformation-Induced &omega; Phase on the Mechanical Properties of Metastable &beta;-Type Ti&ndash;V Alloys

Phonons and phase stability in Ti-V approximants to gum metal

Gum Metal under cyclic tension inspected by a fast and sensitive infrared camera

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Effect of Deformation-Induced ω Phase on the Mechanical Properties of Metastable β-Type Ti–V Alloys

Effect of Deformation-Induced ω Phase on the Mechanical Properties of Metastable β-Type Ti–V Alloys