Omega phase transformation – morphologies and mechanisms

Banerjee, S.; Tewari, R.; Dey, G.K.

doi:10.3139/146.101327

Cited by 90 publications

(59 citation statements)

References 28 publications

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“…This phase may form during quenching from the single β-phase field to room temperature with a hexagonal (not close-packed) crystallographic structure at smaller concentrations of beta phase stabilizing elements (solute lean), whereas the crystallographic structure is trigonal at greater concentrations of beta phase stabilizing elements (solute rich) [34,[47][48][49][50]. Furthermore, if present the metastable martensitic phases and athermal ω-phase will decompose during isothermal aging into α + β, α + β + ω iso , or β + ω iso phases depending on the alloy's phase stability, aging temperature, and aging time.…”

Section: Beta Phase Stabilizing Elementsmentioning

confidence: 99%

“…Contrary to expectations, these elements are added to promote beta phase stability [1]. The isothermal ω-phase increases the strength but reduces the ductility of Ti alloys and hence this phase is not desired in large quantities since it causes severe embrittlement [47,50,51]. Several early studies have illustrated that the addition of Al in binary Ti-V or Ti-Mo alloys reduces the isothermal ω-phase volume fraction and also limits the temporal stability of the ω-phase by accelerating the kinetics of the α-phase nucleation [34,49,51].…”

Section: Alpha Phase Stabilizing Elementsmentioning

confidence: 99%

“…243, no. 1-2, I. Weiss and S. L. Semiatin, Thermomechanical processing of beta titanium Alloys-an overview, [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65]1998, with permission from Elsevier). Table 2.…”

Section: Molybdenum Equivalency (Moe)mentioning

confidence: 99%

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A Review of Metastable Beta Titanium Alloys

Kolli

Devaraj

2018

Metals

465

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%

Section: Alpha Phase Stabilizing Elementsmentioning

confidence: 99%

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A Review of Metastable Beta Titanium Alloys

Kolli

Devaraj

2018

Metals

465

175

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“…Quanto ao envelhecimento em α + β, esse pode ser precedido tanto pelo aquecimento a partir de uma condição inicialmente metaestável à temperatura ambiente, bem como a partir do resfriamento de maneira controlada a partir do campo β até temperatura localizada abaixo da solvus de ωiso [26,47].…”

Section: Decomposição Espinodal E Nucleaçãounclassified

“…i) A fase ω: refere-se à uma estrutura atômica hexagonal encontrada em metais de transição de estrutura cúbica de corpo centrado [47]. Quando desenvolvida a partir da fase  por meio de mecanismos difusionais a fase ω é denominada ω-isotérmico, enquanto o ω-atérmico é obtido por meios adifusionais.…”

Section: Decomposição Espinodal E Nucleaçãounclassified

Estudo <i>in situ</i> da solubilização e do envelhecimento da liga β-metaestável Ti-5Al-5Mo-5V-3Cr-1Zr usando difração de raio-X com luz síncrotron de alta energia

Guimarães¹

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Estudo in-situ da solubilização e do envelhecimento da liga β-metaestável Ti-5Al-5Mo-5V-3Cr-1Zr usando difração de raio-x com luz síncrotron de alta energia RAFAEL PAIOTTI MARCONDES GUIMARÃES São Carlos RAFAEL PAIOTTI MARCONDES GUIMARÃESEstudo in-situ da solubilização e do envelhecimento da liga β-metaestável Ti-5Al-5Mo-5V-3Cr-1Zr usando difração de raio-x com luz síncrotron de alta energia Recently introduced, the new Ti-55531 titanium based alloy has been developed aiming structural applications such as the automotive and aerospace ones. The present Thesis is focused on the assessment of Ti-55531 alloy in situ solid state transformations during ageing at different temperatures as well as initial conditions. In this sense, the study emphasis will deal with both quantitative and qualitative analysis of the main constitutive phases found in the alloy, namely the body-centered cubic β, both hexagonal α and ω and the martensitic α", this one orthorhombic, by means of Rietveld refinement. Concerning the data, it was obtained by high energy x-ray diffraction (HEXRD) technique in a synchrotron light source facility. All the Debye-Scherrer rings resulting from these in situ experiments were analyzed by both FIT2Dand MAUD software.

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