Academic literature on the topic 'Metastable beta Ti alloys'

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Dissertations / Theses on the topic "Metastable beta Ti alloys"

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Lenain, Astrid. "Relationships between thermomechanical processing, microstructure and mechanical properties of the beta metastable Ti-LCB alloy." Université catholique de Louvain, 2007. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-01042008-185446/.

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Despite of their costs, titanium alloys are often used for structural applications due to their high performance to density ratio that allows the manufacturers to reach the aimed mechanical properties. Users are more and more inclined to turn towards the ƓÒ-metastable alloys since they provide a wider range of processing conditions, very attractive corrosion resistance and higher strength levels in comparison to the ƓÑƓyƓÒ alloys. Nevertheless, these alloys present a high sensitivity to the variation in the applied heat- or thermomechanical treatment influencing the final mechanical properties
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Chang, Hui. "Transformations de phase et évolutions des microstructures dans l'alliage de titane beta Ti-B19." Thesis, Vandoeuvre-les-Nancy, INPL, 2010. http://www.theses.fr/2010INPL053N/document.

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Les évolutions de microstructures du nouvel alliage chinois Ti B19 ont été étudiées au cours de divers traitements thermiques et des relations entre microstructures et propriétés mécaniques ont été établies. Les cinétiques de transformations isothermes ont été établies par des mesures de résistivité électrique. Les structures et microstructures ont été caractérisées par DRX synchroton, Microscopies Optiques et Electroniques (MEB, MET). Les cinétiques de transformation et les caractéristiques microstructurales. Les cinétiques de transformation isothermes ont été obtenues, analysées (loi JMAK),
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Bennett, Joe Mancha. "Strengthening of metastable beta titanium alloys." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/284557.

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Using current technology, it is now possible to probe material at atomic length scales, increasing our fundamental understanding of material behavior and properties. Metastable β titanium alloys are a subset of titanium alloys with huge potential for the aerospace sector. However, they exhibit atomic transformations which, even after 60 years of research, are still disputed. For example, these alloys are strengthened using the ω phase, but the mechanism by which this phase forms and its stability are still in question. The aim of this PhD project was to investigate the strengthening of metasta
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Yannetta, Christopher James. "Additive Manufacturing of Metastable Beta Titanium Alloys." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011883/.

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Additive manufacturing processes of many alloys are known to develop texture during the deposition process due to the rapid reheating and the directionality of the dissipation of heat. Titanium alloys and with respect to this study beta titanium alloys are especially susceptible to these effects. This work examines Ti-20wt%V and Ti-12wt%Mo deposited under normal additive manufacturing process parameters to examine the texture of these beta-stabilized alloys. Both microstructures contained columnar prior beta grains 1-2 mm in length beginning at the substrate with no visible equiaxed grains.
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Gupta, Niraj. "First Principles Study of Metastable Beta Titanium Alloys." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804949/.

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The high temperature BCC phase (b) of titanium undergoes a martensitic transformation to HCP phase (a) upon cooling, but can be stabilized at room temperature by alloying with BCC transition metals such as Mo. There exists a metastable composition range within which the alloyed b phase separates into a + b upon equilibrium cooling but not when rapidly quenched. Compositional partitioning of the stabilizing element in as-quenched b microstructure creates nanoscale precipitates of a new simple hexagonal w phase, which considerably reduces ductility. These phase transformation reactions have been
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6

Richardson, Mark D. "Microstructural and mechanical property development in metastable beta titanium alloys." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/12663/.

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Titanium alloys represent an ever increasing proportion of the materials employed in aerostructural applications. Metastable beta alloys in particular, offer high specific strength and good corrosion resistance that allow them to compete with steels. Ti-5Al-5Mo-5V-3Cr and Ti-10V-2Fe-3Al are two such alloys used in the main landing gear of large commercial aircraft. Thermomechanical processing of metastable beta alloys is critical in obtaining the desired microstructure, which in turn governs the mechanical properties. This therefore demands a thorough understanding of the relationship between
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Maeda, Takashi. "Phase equilibrium and beta stability in Ti-rich Ti-V-Al alloys." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47166.

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Han, Jeon Geon. "The effect of surface modification by ion implantation on the fatigue behavior in metastable B-phase Ti-24V alloy." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/32795.

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9

Zhang, Jinyong. "Mechanical Behavior and Microstructural Evolution in Metastable β Ti-Mo Based Alloys with TRIP and TWIP Effects". Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066313/document.

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Dans ce travail, basé sur une approche semi empirique de conception d’alliages de titane à propriétés mécaniques contrôlées, un alliage modèle binaire Ti-12Mo (% massique) et des alliages ternaires sur la base du système Ti-Mo ont été élaborés, combinant des effets TRIP et TWIP lors de la déformation. (TRIP – Transformation Induced Plasticity : plasticité induite par transformation ; TWIP – Twinning Induced Plasticity : plasticité induite par maclage).Les résultats des essais mécaniques montrent que ces alliages présentent une haute résistance mécanique (1000-1200 MPa), une grande plasticité (
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10

Hendrickson, Mandana. "The Role of Misfit Strain and Oxygen Content on Formation and Evolution of Omega Precipitate in Metastable Beta-titanium Alloys." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc955080/.

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β-Ti alloys are widely used in airframe and biomedical applications due to their high ductility, high hardenability, and low elastic modulus. The phase transformations in β-Ti alloys are rather complex due to formation of metastable phases during various thermo-mechanical treatments. One such critical metastable phase, the hexagonal omega (ω) phase, can form in β-Ti alloys under quenching from the high temperature β phase and/or isothermal aging at intermediate temperature. Despite a substantial amount of reported works on the ω phase, there are several critical issues related to the ω formati
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