Influence of the second phase on the room-temperature tensile and creep deformation mechanisms of α-β titanium alloys, part II: Creep deformation

Jaworski, A.; Ankem, Pa. S.

doi:10.1007/bf02586108

Cited by 16 publications

(10 citation statements)

References 25 publications

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“…If greater quantities of beta phase stabilizing elements are included, then the Ti alloy will have a dual-phase α + β alloy microstructure after quenching from above the beta transus temperature, such as in the binary Ti-8.1 wt. % V alloy [41][42][43]. However, an alloy will generally consist of only the metastable bcc β-phase after quenching from above the beta transus temperature when the V concentration is greater than the critical quantity needed to stabilize the bcc β-phase [44].…”

Section: Beta Phase Stabilizing Elementsmentioning

confidence: 99%

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%

A Review of Metastable Beta Titanium Alloys

Kolli

Devaraj

2018

Metals

462

175

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“…Conversely, room temperature creep testing of the two-phase Ti-8.1V (wt%) produced high creep strain with the notable presence of twins in the α phase and stress induced martensite (SIM) in the β phase. Unlike the case of Ti-Mn, the Ti-V alloy exhibited deformation mechanisms in the two-phase system unlike those found in the single-phase counterparts [5,6]. In particular, the size of the α platelets in the direction of twinning was approximately 5 μm, smaller than even the finest grain size in the single-phase α tests (which deformed only by slip), and yet twinning was observed.…”

Section: Experimental Observationsmentioning

confidence: 82%

Recent Advances on the Deformation Behavior of Two-Phase α+β Titanium Alloys

Ankem

Joost

Schwarm

2019

MSF

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Two-phase materials, such as α+β Titanium (Ti) alloys, are technologically important. A number of factors can affect deformation behavior, including the interaction stresses between phases, the crystallographic relationships between phases, and the morphology. As a result, the deformation mechanisms of two-phase alloys may be different from the individual single-phase materials. For example, twinning may not occur in a single phase material if the grain size is very small but twinning can occur in a very fine grained alloy if the second phase contributes to the interfacial stresses due to elastic interactions. Interaction stresses can result from the difference in the elastic properties of the two phases. In particular, these elastic interaction stresses can be quantified by the finite element method (FEM). In this paper recent developments regarding two-phase deformation mechanisms will be reviewed and the ramifications on mechanical behavior in regard to two-phase Ti alloys in particular and on two-phase metallic materials in general will be outlined.

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“…Phase transformations in Ti exhibit deformation characteristics such as hysteresis, retained high-pressure phase, shear effects, and twinning, which are currently not included in many computational models. For the α to ω transformations in titanium (Ti), each material element is modeled to include the hexagonal close--packed (hcp) parent (α) phase and three variants [Jaworski, et, al. (2005)] of the hexagonal (hex) daughter phase (ω 1 , ω 2 , ω 3 ).…”

Section: Fig 1 Schematic Figure Of the Decomposition Of The Deformamentioning

confidence: 99%

A High-Rate, Single-Crystal Model including Phase Transformations, Plastic Slip, and Twinning

Addessio¹,

Bronkhorst²,

Bolme³

et al. 2016

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An anisotropic, rate-dependent, single-crystal approach for modeling materials under the conditions of high strain rates and pressures is provided. The model includes the effects of large deformations, nonlinear elasticity, phase transformations, and plastic slip and twinning. It is envisioned that the model may be used to examine these coupled effects on the local deformation of materials that are subjected to ballistic impact or explosive loading. The model is formulated using a multiplicative decomposition of the deformation gradient. A plate impact experiment on a multi-crystal sample of titanium was conducted. The particle velocities at the back surface of three crystal orientations relative to the direction of impact were measured. Molecular dynamics simulations were conducted to investigate the details of the high-rate deformation and pursue issues related to the phase transformation for titanium. Simulations using the single crystal model were conducted and compared to the high-rate experimental data for the impact loaded single crystals. The model was found to capture the features of the experiments.

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Influence of the second phase on the room-temperature tensile and creep deformation mechanisms of α-β titanium alloys, part II: Creep deformation

Cited by 16 publications

References 25 publications

A Review of Metastable Beta Titanium Alloys

A Review of Metastable Beta Titanium Alloys

Recent Advances on the Deformation Behavior of Two-Phase α+β Titanium Alloys

A High-Rate, Single-Crystal Model including Phase Transformations, Plastic Slip, and Twinning

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