Recent developments in microstructure/property relationships of beta titanium alloys

Ankem, Sreeramamurthy; Greene, Charles A.

doi:10.1016/s0921-5093(98)01170-8

Cited by 178 publications

(102 citation statements)

References 3 publications

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“…As expected, the volume fraction of alpha declines with increasing temperature, and the microstructure transitions from a refined basket weave microstructure consisting of interpenetrating a laths, to coarse, discrete a particles dispersed in the b matrix. Usually, the finer scaled a phase is desired for the increased hardness and strength, and much work has been done to engineer finer scale structures in b-21S [13,17]. To show this change in mechanical properties across this thermally graded sample, a rudimentary assessment was conducted by measuring the Vickers microhardness at the four points Table 2.…”

Section: Resultsmentioning

confidence: 99%

Engineered, Spatially Varying Isothermal Holds: Enabling Combinatorial Studies of Temperature Effects, as Applied to Metastable Titanium Alloy β-21S

Martin

Samimi

Collins

2017

Metallogr. Microstruct. Anal.

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A novel method to systematically vary temperature and thus study the resulting microstructure of a material is presented. This new method has the potential to be used in a combinatorial fashion, allowing the rapid study of thermal holds on microstructures to be conducted. This is demonstrated on a beta titanium alloy, where the thermal history has a strong effect on microstructure. It is informed by simulation and executed using the resistive heating capabilities of a Gleeble 3800 thermomechanical simulator. Spatially varying isothermal holds of 4 h were affected, where the temperature range of the multiple isothermal holds varied by *175°C.

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Section: Resultsmentioning

confidence: 99%

Engineered, Spatially Varying Isothermal Holds: Enabling Combinatorial Studies of Temperature Effects, as Applied to Metastable Titanium Alloy β-21S

Martin

Samimi

Collins

2017

Metallogr. Microstruct. Anal.

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“…Al is one of the most important α-phase stabilising elements. The interstitials O, N, and C tend to stabilise the α-phase, too, whereas V and Fe are regarded as β-phase stabilising elements because of lowering the temperature of transformation (from α-titanium alloy to β-titanium alloy) [7,8].…”

Section: Methodsmentioning

confidence: 99%

Strain-Dependent Damping of Ti-10V-2Fe-3Al at Room Temperature

2016

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The Ti-10V-2Fe-3Al alloy is advantageous over other titanium grades due to its high tensile strength and its high resistance against creep, cracking, and corrosion. The investigated alloy was hammer-forged inducing high strain rates in the material at a temperature of 800• C and underwent different cooling procedures. Three in that way thermomechanically treated specimens were prepared for subsequent study of the vibration behaviour of the material with the help of non-destructive, contact-free acoustic measurements. Resulting time-dependent decaying acoustic signals were analysed to investigate the dependence of the material damping behaviour on the individual downstream thermal treatment procedure and, ultimately, on the microstructural changes.

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“…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]. Beta-Ti stability can be empirically quantified by the Molybdenum equivalent (Mo eq metric) [40], where the alloy is considered stable against martensitic transformation roughly above a Mo eq value of 10.…”

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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Recent developments in microstructure/property relationships of beta titanium alloys

Cited by 178 publications

References 3 publications

Engineered, Spatially Varying Isothermal Holds: Enabling Combinatorial Studies of Temperature Effects, as Applied to Metastable Titanium Alloy β-21S

Engineered, Spatially Varying Isothermal Holds: Enabling Combinatorial Studies of Temperature Effects, as Applied to Metastable Titanium Alloy β-21S

Strain-Dependent Damping of Ti-10V-2Fe-3Al at Room Temperature

Multiscale analysis of nanoindentation-induced defect structures in gum metal

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