Study of the nanostructure of Gum Metal using energy-filtered transmission electron microscopy

Yano, Takeshi; Murakami, Yasukazu; Shindo, Daisuke; Kuramoto, Shigeru

doi:10.1016/j.actamat.2008.10.002

Cited by 60 publications

(33 citation statements)

References 18 publications

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“…Most probably, the stress-induced growth of martensitic nanodomains is the underlying deformation mechanism of the nonlinear recoverable strain of Gum Metal [7][8][9][10]. However, some reports [4,6] suggest that omega precipitates can play a role in this deformation stage as well.…”

Section: Introductionmentioning

confidence: 94%

“…However, the long-range martensitic transformation was explained to be suppressed by a specific oxygen content. Advanced microstructural analyses found a presence of nanodomains of martensite and precipitations of omega phase in Gum Metal [4,5]. Both of the phases are of order of few nanometers [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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

Self Cite

View full text Add to dashboard Cite

show abstract

“…The remaining question in this study is, given that typical BCC twinning modes and stressinduced  have been observed in as-received CWGM samples [37,10] and upon deformation of STGMs [14,15], "why we would fail to observe them here?" Firstly, it is well known that the operating deformation mechanism of Beta-Ti alloys is extremely sensitive to the stability of the beta phase [38,39].…”

Section: Dislocation-mediated Plasticity In Stgmsmentioning

confidence: 99%

Multiscale analysis of nanoindentation-induced defect structures in gum metal

et al. 2018

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Using ex-situ transmission electron microscopy and the recently developed nanoprobe diffraction (NPD) technique, we characterize a nanoindented solution treated gum metal.Lattice rotations are resolved at a 1.2 nanometer length-scale and shown to be continuous within the nanoindentation pit; further, it is shown that these can be accommodated by a reasonable number of geometrically necessary dislocations at a density of ~10^15/m 2 . We additionally provide direct evidence that dislocations within the nanoindent, rather than secondary phase nanoparticles, can serve as potent barriers to dislocation motion. We also demonstrate that plasticity in these alloys under nanoindentation can be accommodated solely by dislocation nucleation and propagation, with no competing deformation mechanisms present. Conventional transmission electron microscopy and "gb" analysis reveal the presence of dislocations on <-111>{110} slip systems and highly localized plastic deformation in the form of shear bands on <111>{-1-12} slip systems, similar to previously observed "giant faults". Keyword

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“…Moreover, Yano et al (2009) [12] conveyed that super plastic deformability is one of the properties of nanostructure materials which are produced in the way of severe plastic deformation (SPD). So, large strain could be occurred in these materials and finite plasticity deformation is an appropriate theory for modelling plastic deformation in microstructures and nanostructure materials.…”

Section: Introductionmentioning

confidence: 99%

A Novel Methodology in Modelling Dislocations for Analyzing Microstructures and Nanostructure Materials in Plastic Media

Farahmand¹

2011

IJAPM

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Abstract-Several methodologies have been proposed to model the effect of length scale parameters to improve constitutive equations for analyzing microstructures and nanostructure materials. Most of them are developed based on strain gradient theory. The main restriction is contributed to the large scale of imposed plastic deformation in comparison with implementation of length scale parameters. Also comparing to the scale of dislocation movement and hardening mechanisms, the plastic deformation in microstructures and nanostructure materials is sufficiently large that finite plasticity theory could be well justified. Therefore, the main intention of this paper is to develop strain gradient deformation with the corporation of finite plastic and dislocation theory as physically based attribution in constitutive equations. This procedure is accomplished with intrinsic length scale relation, which is dedicated to develop phenomenological of plasticity laws for microstructures in finite plasticity. Finally, the result of new theory gives for microstructures, and its predictable results are discussed for nanostructure materials.

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Study of the nanostructure of Gum Metal using energy-filtered transmission electron microscopy

Cited by 60 publications

References 18 publications

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

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

Multiscale analysis of nanoindentation-induced defect structures in gum metal

A Novel Methodology in Modelling Dislocations for Analyzing Microstructures and Nanostructure Materials in Plastic Media

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