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Dissertations / Theses on the topic 'Alpha- and beta-phases titanium alloy'

Author: Grafiati

Published: 4 June 2025

Last updated: 23 June 2025

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1

Ward, A. R. "Creep and creep fracture of alpha + beta titanium alloy 6.2.4.6." Thesis, Swansea University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639344.

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High precision uniaxial constant stress creep tests were carried out at 773K for the α+β titanium alloy Ti 6.2.4.6. Repeat data at 580 MPa provided a unique opportunity to identify stochastic creep properties and to use this information to build a probabilistic creep damage assessment for this alloy. The stochastic nature of creep properties both at a single test condition (using a generalised gamma distribution) and at various test conditions (by combining this distribution with the Monkman - Grant relation) was identified. In addition, the theta prediction methodology was extended so that life predictions for materials operating under long service conditions can be made that also have a degree of confidence associated with them. Ways in which the theta model can be applied to the fatigue as well as the creep of all materials are also discussed. For comparison purposes two failure criteria are built into the stochastic model and the determinants of failure derived. This stochastic theta model is then used to investigate the nature of the creep failure time distribution for the Ti 6.2.4.6 alloy under constant uniaxial conditions. The corrosion resistance between 723K and 1123K of Ti 6.2.4.6 has also been investigated. There was evidence in favour of parabolic rather than linear increases in weight gain with time and the activation energy associated with parabolic oxidation was estimated at 216KJ/mol. The life of Ti-6246 in argon at 773K was found at certain stresses to be almost twice that obtained in air. This difference could not be explained by the loss of load bearing cross-section area following oxidation. Biaxial creep tests were also carried out at an effective stress of 800 MPa to determine the part taken by the stress state on damage and fracture in the 6.2.4.6 alloy.

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2

Kloenne, Zachary Thomas. "Deformation Study of the Novel Alpha/Beta Titanium Alloy, Ti-407." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1606910373335718.

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3

Searles, Thomas K. "Microstructural characterization of the alpha / beta titanium alloy Ti-6Al-4V." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1407510262.

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4

Behera, Amit Kishan. "A Study of Mechanisms to Engineer Fine Scale Alpha Phase Precipitation in Beta Titanium Alloy, Beta 21S." Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc283838/.

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Metastable b-Ti alloys are titanium alloys with sufficient b stabilizer alloying additions such that it's possible to retain single b phase at room temperature. These alloys are of great advantage compared to a/b alloys since they are easily cold rolled, strip produced and can attain excellent mechanical properties upon age hardening. Beta 21S, a relatively new b titanium alloy in addition to these general advantages is known to possess excellent oxidation and corrosion resistance at elevated temperatures. A homogeneous distribution of fine sized a precipitates in the parent b matrix is known to provide good combination of strength, ductility and fracture toughness. The current work focuses on a study of different mechanisms to engineer homogeneously distributed fine sized a precipitates in the b matrix. The precipitation of metastable phases upon low temperature aging and their influence on a precipitation is studied in detail. The precipitation sequence on direct aging above the w solvus temperature is also assessed. The structural and compositional evolution of precipitate phase is determined using multiple characterization tools. The possibility of occurrence of other non-classical precipitation mechanisms that do not require heterogeneous nucleation sites are also analyzed. Lastly, the influence of interstitial element, oxygen on a precipitation during the oxidation of Beta 21S has been determined. The ingress of oxygen and its influence on microstructure have also been correlated to measured mechanical properties.

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5

Stevens, Katherine Anne. "The low-cycle fatigue behavior of an alpha-two + Beta Titanium Aluminide Alloy /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486462702466278.

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6

Matychak, Yaroslav, Oleh Yaskiv, Viktor Fedirko, I. Pohreljuk, and Oleh Tkachuk. "Modelling of diffusion saturation of (alpha+beta) titanium alloy by oxygen in rarefied gaseous medium." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-193445.

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7

Matychak, Yaroslav, Oleh Yaskiv, Viktor Fedirko, I. Pohreljuk, and Oleh Tkachuk. "Modelling of diffusion saturation of (alpha+beta) titanium alloy by oxygen in rarefied gaseous medium." Diffusion fundamentasl 6 (2007) 25, S. 1-2, 2007. https://ul.qucosa.de/id/qucosa%3A13148.

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8

Broderick, Thomas Froats. "The Influence of Microstructure on the Deformation Behavior of Beta Solution Heat Treated and Aged Ti-6Al-2Sn-2Zr-2Mo-2Cr-0.18Si." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1263951781.

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9

Dumanowski, Bruno. "Simulation de traitements thermomécaniques de l'alliage de titane Ti-6%Al-4%V dans le domaine biphasé (alpha+beta)." Grenoble INPG, 1997. http://www.theses.fr/1997INPG4204.

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Les liens qui unissent les proprietes mecaniques de l'alliage de titane ti-6al-4v a son etat microstructural sont etroits. Ce sont les operations de mise en forme a chaud qui conferent a cet alliage sa microstructure. L'apparition des structures de produits forges industriellement est etudiee par le truchement de l'essai de compression axisymetrique a chaud. Afin de disposer de taux de deformation precis au sein des echantillons deformes, une analyse mecanique de l'essai de compression uniaxiale est tout d'abord effectuee. Il s'agit d'un modele utilisant le theoreme de la borne superieure. Il permet de connaitre le taux de deformation locale en fonction de la deformation globale appliquee aux echantillons. Les resultats sont confrontes a ceux fournis, pour les memes conditions de compression, par le code d'elements finis forge2. La partie experimentale est divisee en deux chapitres. Le premier s'interesse a la formation de la structure equiaxe a partir d'une structure lamellaire grossiere. Le second rend compte de l'affinement de microstructures equiaxes. Dans chacun d'eux, on trouve la description des microstructures initiales, le detail et les mecanismes de leur transformation ainsi que les courbes contrainte-deformation associees. Les resultats sont synthetises dans des diagrammes temperature-deformation locale. Les textures de deformation sont egalement determinees et analysees.

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10

Barry, Erin Patricia. "Three-dimensional reconstruction of microstructures in [alpha] + [Beta] titanium alloys." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1211214635.

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11

Kar, Sujoy Kumar. "Modeling of mechanical properties in alpha/beta-titanium alloys." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1122570452.

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12

Zheng, Yufeng. "Nucleation Mechanisms of Refined Alpha Microstructure in Beta Titanium Alloys." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366296464.

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13

Goddard, Nicholas David Richard. "Microstructural influence on fatigue in two alpha plus beta titanium alloys." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47078.

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14

Sinha, Vikas. "Effects of microstructure on fatigue behavior of [alpha]/[beta] Titanium Alloys /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488192119263968.

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15

Bhattacharyya, Dhriti. "The development of textures and microstructures in alpha/beta titanium alloys." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1086195557.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xxii, 220 p. : ill. (some col.). Advisor: Hamish L. Fraser, Materials Science and Engineering. Includes bibliographical references (p. 217-220).

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16

Brandes, Matt C. "Creep, Fatigue, And Deformation Of Alpha And Alpha-Beta Titanium Alloys At Ambient Temperature." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1221848896.

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17

Dixit, Vikas. "Grain-Boundary Parameters Controlled Allotriomorphic Phase Transformations in Beta-Processed Titanium Alloys." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1357240292.

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18

Lee, Eunha. "Microstructure evolution and microstructure/mechanical properties relationships in [alpha]+[beta] titanium alloys." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1092756139.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xxiii, 229 p.; also includes graphics (some col.) Includes bibliographical references (p. 224-229). Available online via OhioLINK's ETD Center

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19

Hill, Davion M. "Microstructure and mechanical properties of titanium alloys reinforced with titanium boride." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1150402807.

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20

Nag, Soumya. "Influence of Beta Instabilities on the Early Stages of Nucleation and Growth of Alpha in Beta Titanium Alloys." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1204570232.

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21

Jaworski, Allan Wayne. "Effect of microstructure on the room temperature tensile and creep deformation mechanisms of alpha-beta titanium alloys." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2388.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2005.<br>Thesis research directed by: Material Science and Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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22

Savage, Michael Francis. "Microstructural and mechanistic study of low temperature creep and dwell fatigue in single colony alpha/beta Titanium Alloys /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488203857249325.

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23

Koduri, Santhosh K. "Application of Bayesian Neural Network Modeling to Characterize the Interrelationship between Microstructure and Mechanical Property in Alpha+Beta-Titanium Alloys." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275402649.

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24

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), et cet ensemble de résultats a conduit à l'établissement du diagramme TTT de l'alliage TiB19. Enfin il a été montré que la vitesse de chauffage a une très forte influence sur les transformations mises en jeu, et qu'une pré déformation plastique accélère les cinétiques de transformation (introduction de nouveaux sites de germination). Enfin les cinétiques de transformation ont été caractérisées en refroidissement continu depuis le domaine monophasé bêta. Une première approche de la modélisation des cinétiques de transformation a été menée en utilisant le loi JMAK et le principe d'additivité de Scheil. Enfin les relations entre microstructures et propriétés sont discutés<br>The phase transformations and microstructure evolutions has been characterized for different thermal treatments, and the relationships between final microstrures and properties have been investigated in the new metastable Ti-B19 alloy. The isothermal phase transformation kinetics and the influence of different heat treatment phaths have been establisheb by using in-situ electrical Resistivity. The structures have been determined by synchrotron X-Ray Diffraction and the microstructures were observed by SEM and TEM. The results show that phase transformation kinetics and microstructure characteristics are strongly dependent on the aging temperature (ranging from 300 to 700°C). The global isothermal phase transformation phase transformation kinetics has been got and anallyzed with JMAK equation, and the TTT diagram of Ti-B19 alloy has been established. We have also shown that the heating rate has remarkable influence on the isothermal phase transformation behaviors and the pre-deformation accelerates the transformation kinetics. The microstructure evolutions during cooling are obviously dependent on the cooling rates. A first attempt has been made to calculate the transformation kinetics during cooling using JMAK law and Scheil principle. Finally, the relationship between mechanical properties and microstructure has been discussed

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25

Huguet, Anne. "Etude à la sonde atomique et par microscopie ionique à champ de la composition des phases alpha deux et gamma dans des alliages à base TiAl." Rouen, 1994. http://www.theses.fr/1994ROUES072.

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La structure fine d'alliages intermétalliques à base TiAl monophasés gamma et biphasés alpha deux et gamma, matériaux potentiels pour des applications structurales à haute température dans le domaine de l'aérospatial, est étudiée par microanalyse au moyen de la sonde atomique et du microscope ionique. La première partie de cette étude traite de la distribution de l'oxygène, du carbone et de l'azote, impuretés interstitielles d'élaboration, dans des alliages monophasés gamma et biphasés alpha deux et gamma. A partir des résultats expérimentaux, une analyse critique du rôle des éléments interstitiels vis-à-vis de la ductilité à basse température de ces matériaux est donnée. L'étude de l'évolution thermique de la structure lamellaire alpha deux et gamma de matériaux à base TiAl biphasés constitue la seconde partie de ce mémoire. L'hypothèse d'une compétition entre les mécanismes de coalescence discontinue et continue des lamelles y est proposée et discutée

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26

Mraizika, Florence. "Evolutions microstructurales en compression à chaud des alliages de titane betacez et 6246 et influence du forgeage sur la transformation [beta] -> [alpha]." Grenoble INPG, 1996. http://www.theses.fr/1996INPG4206.

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Les relations entre les gammes thermomecaniques et les microstructures des alliages de titane sont encore insuffisament connues. Ce travail se propose d'ameliorer la connaissance des etats structuraux resultant du forgeage beta et de ceux resultant de la transformation beta vers alpha-beta ulterieure. Les influences des deux parametres taux et vitesse de deformation sur les evolutions microstructurales et texturales se produisant lors du forgeage ainsi que de la transformation beta/alpha sont systematiquement explorees. Les evolutions texturales mettent en evidence une augmentation de la composante <111> lorsque la vitesse de deformation augmente. Les mecanismes qui president a la formation des microstructures de deformation ont ete mis en evidence. Aux fortes vitesses de deformation, le dentellement des joints par sibm et la desorientation des parois par recristallisation continue sont a l'origine de la formation des nouveaux grains. Les nouveaux grains ont toujours une orientation qui peut etre reliee a celle des grains parents et l'orientation <111> des grains initiaux est favorable a la germination. La formation de petits grains aux ex-joints beta entre deux taux de deformation 0. 25 et 1. 5 provoque une augmentation de la densite de joints et de la valeur de la desorientation moyenne. Cette germination induit une hausse du nombre de sites de germination et donc une acceleration de la cinetique de precipitation beta/alpha ulterieure entre deux taux de deformation 0. 25 et 1. 5. Aux faibles vitesses de deformation, la stabilite des microstructures du fait de l'intervention des mecanismes de restauration et de migration des parois est responsable de la non influence du taux de deformation sur les cinetiques de precipitation. A faible taux de deformation, lorsque la vitesse de deformation augmente, entre 10#-#1 et 10#-#3 s#-#1 la cinetique de precipitation augmente ; ceci est relie a l'efficacite des joints et a la densite des sous-joints qui augmentent avec la vitesse de deformation. A fort taux de deformation, entre 10#-#1 et 10#-#3 s#-#1 l'augmentation du nombre de sites de germination s'ajoute aux deux autres facteurs cites pour accroitre la cinetique de facon plus accusee

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27

Diak, Bradley J. "The effect of morphology of [alpha] and [beta] phases on superplastic properties of Ti-6Al-4V alloy." 1991. http://hdl.handle.net/1993/17310.

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