The effect of time-dependent twinning on low temperature (&lt;0.25∗Tm) creep of an alpha-titanium alloy

Oberson, P. Gregory; Ankem, Sreeramamurthy

doi:10.1016/j.ijplas.2008.06.002

Cited by 55 publications

(17 citation statements)

References 47 publications

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“…If the beta phase stabilizing element is included only in a limited quantity that is less than the critical concentration listed in Table 1, then the Ti alloy microstructure will consist of only the hcp α-phase after quenching from above the quantity T β , such as in the binary Ti-1.6 wt. % V alloy [39,40]. Although the beta phase stabilizing element V is included in the binary alloy, the concentration is significantly less than the critical concentration of 15 wt.…”

Section: Beta Phase Stabilizing Elementsmentioning

confidence: 99%

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A Review of Metastable Beta Titanium Alloys

Kolli

Devaraj

2018

Metals

462

175

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Abstract:In this article, we provide a broad and extensive review of beta titanium alloys. Beta titanium alloys are an important class of alloys that have found use in demanding applications such as aircraft structures and engines, and orthopedic and orthodontic implants. Their high strength, good corrosion resistance, excellent biocompatibility, and ease of fabrication provide significant advantages compared to other high performance alloys. The body-centered cubic (bcc) β-phase is metastable at temperatures below the beta transus temperature, providing these alloys with a wide range of microstructures and mechanical properties through processing and heat treatment. One attribute important for biomedical applications is the ability to adjust the modulus of elasticity through alloying and altering phase volume fractions. Furthermore, since these alloys are metastable, they experience stress-induced transformations in response to deformation. The attributes of these alloys make them the subject of many recent studies. In addition, researchers are pursuing development of new metastable and near-beta Ti alloys for advanced applications. In this article, we review several important topics of these alloys including phase stability, development history, thermo-mechanical processing and heat treatment, and stress-induced transformations. In addition, we address recent developments in new alloys, phase stability, superelasticity, and additive manufacturing.

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Section: Beta Phase Stabilizing Elementsmentioning

confidence: 99%

“…% V alloy [39,40]. Although the beta phase stabilizing element V is included in the binary alloy, the concentration is significantly less than the critical concentration of 15 wt.…”

Section: Beta Phase Stabilizing Elementsmentioning

confidence: 99%

A Review of Metastable Beta Titanium Alloys

Kolli

Devaraj

2018

Metals

462

175

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“…The activation energy for deformation twinning in magnesium is unknown; however, it is interesting to note that the activation energy in another HCP metal has been reported to be 40 kJ/mol, when the deformation twinning contributes to deformation. 40) This result suggests that the deformation mechanism for strain rate change at a set strain of 0.05 competes with the deformation twinning. The imposed strain of MgY alloys affects the deformation mechanisms, and these behaviors are found to consist with the deformed microstructural observations, as shown in Figs.…”

Section: Resultsmentioning

confidence: 91%

Effect of Micro-Alloying Elements on Deformation Behavior in Mg–Y Binary Alloys

et al. 2014

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The effect of minor addition of yttrium element on deformation behavior was investigated using MgX at%Y (X = 0.01, 0.02, 0.03, 0.04 and 0.05) dilute alloys and pure magnesium with an average grain size of about 50 µm. The stress and strain curves in all the alloys showed a sigmoidal shape in the compression tests, which suggested the formation of {1012}-type twinning due to the lack of slip system. On the other hand, yttrium atom addition of more than 0.03 at% was effective to affect the deformation behavior: a large compressive strain of 0.5 was possible to obtain, and the sub-grained and fine-grained structures were formed even at room temperature in three kinds of alloys. The dominant deformation mechanism in these alloys was the twinning at the beginning of the state and the dislocation slip with further imposed strain.

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“…Matsunaga et al [2] reported an inverse dependence of the RT steady-state creep rate on the grain size, and low activation energy, attributed to grain-boundary sliding. By contrast, Oberson et al [3] observed an increase in low-temperature creep rate in Ti-1.6 wt% V and Ti-0.4wt% Mn with the grain size, attributed to a slow growth of twins, more easily formed in large grains. According to Matsunaga et al [4] twinning would, on the contrary, hinder RT creep in CP Ti.…”

Section: Introductionmentioning

confidence: 82%

Room‐Temperature Creep and Stress Relaxation in Titanium: Influence of Oxygen and Hydrogen Contents

Barkia

Doquet

Couzinié

et al. 2016

Proceedings of the 13th World Conference on Titanium

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Creep and stress relaxation tests were run at 20°C along the rolling and transverse directions on three batches of Ti with different O and H contents. Oxygen-induced dynamic strain aging hindered creep at low stress, while solute H enhanced it and promoted aging-induced rejuvenation of the creep potential. Secondary creep rates varied exponentially with the stress, in the same way along RD and TD. Creep of T40 and T60 was controlled by screw dislocations gliding along prismatic and pyramidal planes, while for a lower O content and larger grain size, mechanical twinning contributed to creep. Up to 40% of the flow stress was relaxed within 20 hours, according to a loading direction and O content-independent kinetics.

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The effect of time-dependent twinning on low temperature (<0.25∗Tm) creep of an alpha-titanium alloy

Cited by 55 publications

References 47 publications

A Review of Metastable Beta Titanium Alloys

A Review of Metastable Beta Titanium Alloys

Effect of Micro-Alloying Elements on Deformation Behavior in Mg–Y Binary Alloys

Room‐Temperature Creep and Stress Relaxation in Titanium: Influence of Oxygen and Hydrogen Contents

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The effect of time-dependent twinning on low temperature (<0.25∗Tm) creep of an alpha-titanium alloy

Cited by 55 publications

References 47 publications

A Review of Metastable Beta Titanium Alloys

A Review of Metastable Beta Titanium Alloys

Effect of Micro-Alloying Elements on Deformation Behavior in Mg&ndash;Y Binary Alloys

Room‐Temperature Creep and Stress Relaxation in Titanium: Influence of Oxygen and Hydrogen Contents

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Effect of Micro-Alloying Elements on Deformation Behavior in Mg–Y Binary Alloys