Relevant bibliographies by topics / Aluminidy titanu

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Aluminidy titanu'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Aluminidy titanu"

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Castellanos, S., and J. Lino Alves. "A Review of Milling of Gamma Titanium Aluminides." U.Porto Journal of Engineering 3, no. 2 (2018): 1–9. http://dx.doi.org/10.24840/2183-6493_003.002_0001.

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Intermetallic titanium aluminide alloys are used in the high technology engineering field with the goal of achieving weight reduction in different components, exposed to corrosive environments and high temperatures in aeronautical and automotive industries. Despite their attractive properties such as low density, high strength, high stiffness and good corrosion, creep and oxidation resistance, the machinability of titanium aluminide alloys is difficult due to its high hardness, chemical reactivity, and low ductility. This article reviews the state of the art regarding the machinability of titanium aluminide alloys and focuses on the analysis of the milling process, namely the process parameters, surface integrity and cutting tools. The influence of titanium aluminides properties on the machinability is also discussed presenting some current trends and further needed research.
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Kim, Myoung Gyun, Si Young Sung, Gyu Chang Lee, Joon Pyo Park, and Young Jig Kim. "Investment Casting of Near-Net Shape Gamma Titanium Aluminide Automotive Turbocharger Rotor." Materials Science Forum 475-479 (January 2005): 2547–50. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2547.

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The objective of this study was to optimize the casting design of gamma titanium aluminde automotive turbocharger rotor by means of the practical experiment and numerical simulation. Gamma titanium aluminide rotors were produced by centrifugal casting methods on a laboratory scale. Based on the metal-mold reaction of gamma titanium aluminide, the investment molds were manufactured by an electro-fused Al2O3 mold. The experimental results showed that the castings failed to reach the end of the cavities due to insufficient centrifugal force and a lower fluidity compared to the other metals. Although the satisfactory results were not obtained in the numerical simulation, it was concluded that numerical simulation aided to achieve understanding of the casting process and defect formation in gamma titanium aluminide turbocharger rotor castings.
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Alexandrescu, Elvira, Alexandra Banu, Mihai Trifănescu, and Alexandru Paraschiv. "Gamma Titanium Aluminides Behavior at High Temperature Static Short-Term Stress." Applied Mechanics and Materials 657 (October 2014): 407–11. http://dx.doi.org/10.4028/www.scientific.net/amm.657.407.

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Today conventional titanium-based alloys represent one third of the weight of modern aircraft engines and, are the second most used engine material following Ni-based superalloys. [1] Titanium aluminide alloys based on intermetallic phases γ (TiAl) and α2 (Ti3Al) and the most recent – orthorhombic titanium aluminide, are widely recognized as having the potential to meet the design requirements for high temperature applications. The outstanding thermo-physical and mechanical properties of these materials rely mainly on the strongly ordered nature and the directional bonding of the compounds. These involve: high melting point, above 1460°C, low density of 3,9-5 g/cm3, according the alloying degree, high elastic modulus (high stiffness), high yield strength and good creep resistance at high temperature, low diffusion coefficient, good structural stability at high temperature. The main objective of our paper are focussed on the short-term mechanical properties if Titanium niobium aluminide at 850°C. High temperatures mechanical properties evaluation was performed by tensile testing at temperature of 850°C on universal static and dynamic testing machine Instron 8802, equipped with high temperature system, for maximum 1000°C, and extensometer with a measuring basis of 40 mm. The mechanical tensile test was performed according the ASTM E8, with control of deformation and a testing rate of 10-4 mmsec.-1. Short-term behavior request of the support uncovered alloys, at 850°C has proved to be modest and it seems obvious that the alloys based on titanium aluminides cannot be used without protective coatings. Key words: titanium aluminides, high temperatures, mechanical properties
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Knight, S. T., P. J. Evans, and M. Samandi. "Titanium aluminide formation in Ti implanted aluminium alloy." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 119, no. 4 (1996): 501–4. http://dx.doi.org/10.1016/s0168-583x(96)00454-5.

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Kochmańska, Agnieszka, and Paweł Kochmański. "Aluminide Protective Coatings Obtained by Slurry Method." Materials Science Forum 782 (April 2014): 590–93. http://dx.doi.org/10.4028/www.scientific.net/msf.782.590.

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The slurry aluminide coatings are produced on the three kind of substrates: hightemperature creep resistant cast steel, titanium alloy and nickel alloy. The slurry as active mixture containing aluminium and silicon powders, an activator and an inorganic binder. The coating were obtained by annealed in air atmosphere. The structure of these coatings is two zonal and depend on the type of substrate and technological parameters of producing.
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Chen, Yuyong, and D. D. L. Chung. "Ductile and strong aluminium-matrix titanium aluminide composite formedin situ from aluminium, titanium dioxide and sodium hexafluoroaluminate." Journal of Materials Science 30, no. 18 (1995): 4609–16. http://dx.doi.org/10.1007/bf01153069.

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Jones, H. "Structure hardening titanium aluminide during heat treatment of aluminium composite." Metal Powder Report 57, no. 4 (2002): 40. http://dx.doi.org/10.1016/s0026-0657(02)80132-1.

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Kalyniuk, M. M., Ya P. Gritskiv, and L. M. Kahitanchuk. "Eloboration of Methods for Determination on Content of the Oxygen, Nitrogen, Hydrogen Admixtures in Titanium Aluminides." Metrology and instruments, no. 2 (May 21, 2020): 61–67. http://dx.doi.org/10.33955/2307-2180(2)2020.61-67.

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Titanium intermetalides (TiAl and Ti3 Al) and alloys on theirs bases applies in air — and spacetechnology and automobile industry. Physical and mechanical properties there alloys is better, then at classical Ti — or Ni — alloys, that are utilized in aeroplanes and rocets. Alloys, based on TiAl and Ti3Al, are made with utilization vacuum — arc, plasma — arc, induction- garnisage, magnetoperating electroslag melting, electron — beam melting with intermediate capacity, electroslag melting in inert atmosphere under «active» fluxes with metallic calcium, induction melting in muchsectional crystallizator and cold crucible, argon — arc melting with unexpended tungsten electrode in copper watercooling crucible. For connection of the details, that were made from these alloys, there were used welding by pressure, contact, electron — beam, diffusion welding. Alloys, based on titanium aluminide, have essential defects — high brittleness and low plasticity, viscosity and resistance thermal impact strength. Autors a lot of articles explaines these descriptions by structural special features of titanium aluminides and alloys on their bases, but does not consider possibilities of the influence by oxygen nitrogen, hydrogen admixtures. In literature information about methods of determination gaseous admixtures (O, N, H) contents in titanium aluminides and alloys on their bases are absented. Methods of determination oxygen, nitrogen, hyd­rogen contents in titanium aluminides on ana­lysers TC436, RO316, TN114, RH402 are created. Parameters of these methods are described in this article (temperatures of heating on graphite crucibles, times, masses of analytical samples).
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Uenishi, K., A. Sugimoto, and K. F. Kobayashi. "Titanium Aluminides on Aluminium Surfaces by CO2 Laser Alloying." International Journal of Materials Research 83, no. 4 (1992): 241–45. http://dx.doi.org/10.1515/ijmr-1992-830406.

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Niu, Li Bin, Chun Yuan, and Du Meng Cao. "Preparation of In Situ Al3TiP/Al-Based Composite Coating." Advanced Materials Research 503-504 (April 2012): 503–6. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.503.

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In the paper, titanium tri-aluminide (Al3Ti) particles reinforced aluminium (Al)-based composite coatings were fabricated by infiltration plus in-situ techniques at 891.3 °C. The obtained composite coatings are characterized by XRD, SEM and friction and wear testers. The experimental results show that the reaction between Ti wires and Al molten increases with extending time, Ti wires can totally transform into Al3Ti particles for 20 min, which present blocky and strip-like states, respectively. The wear rates of the composite coatings decrease with increasing time.
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Dissertations / Theses on the topic "Aluminidy titanu"

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Stejskal, Pavel. "Reakční syntéza objemových intermetalických materiálů z kineticky nanášených depozitů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230855.

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This work deals with issues of preparation of intermetallics based on iron, nickel and titanium aluminides. It works with an idea of preparation of bulk material by reaction synthe-sis from kinetic spraying deposits by cold spray. Theoretical part is concerned with phases and compounds of these aluminides for structural applications, their characteristics and present fabrication. In experimental part there are studied microstructures created by annealing of deposits.
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Gagné, Stéphane. "Effets de l'augmentation de la teneur en titane sur l'affinage des grains de l'alliage A356.2 /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2005. http://theses.uqac.ca.

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Romberg, Jan. "Feinlagige und feinkristalline Titan/Aluminium-Verbundbleche." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-156430.

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Ein Verbundwerkstoff aus Titan und Aluminium kann mittels akkumulativem Walzplattieren hergestellt werden. Dabei wird die Dehngrenze angehoben, wenn die Titanlagen nicht abschnüren, sondern laminar bleiben. Die Herstellung eines laminaren Ti/Al-Verbundwerkstoffes ist neu gegenüber den bisherigen Studien. Diese Dissertation beschreibt die Hindernisse und Lösungen, die aus metallphysikalischer Überlegung entstanden und praktisch umgesetzt worden sind. Bei der starken Umformung je ARB-Zyklus neigt das Titan bereits beim zweiten Walzen zur Bildung von Einschnürungen. Das kann durch eine Verringerung der Dickenreduktion je Zyklus sowie durch eine Erhöhung der Verfestigungsrate unterdrückt oder verzögert werden. Walzen mit unterschiedlich großen Ober- und Unterwalzen führt im Vergleich zum symmetrischen Walzen bei gleicher Dickenreduktion zu verstärktem Einschnüren der Titanlagen. Da der Prozess jedoch eine Verringerung der Dickenreduktion erlaubt, ermöglicht er die Zahl der Einschnürungen bei gegenüber dem Quartowalzen gleicher Geschwindigkeit zu verringern. Die spezifische Festigkeit erreicht hierbei einen Wert von auf dem Niveau hochfester Stähle.
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Sankaran, Ananthi Hazotte Alain Bouzy Emmanuel. "Etude de la structure massive dans des alliages à base TiAl et de son évolution en cours de traitements thermiques." Metz : Université de Metz, 2009. ftp://ftp.scd.univ-metz.fr/pub/Theses/2009/Sankaran.Ananthi.SMZ0908.pdf.

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Godfrey, Stuart Paul. "The joining of gamma titanium aluminide." Thesis, University of Birmingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.633099.

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This thesis presents a microstructural evaluation of the gamma titanium aluminide alloy Ti-48Al-2Mn-2Nb (at.%) joined by diffusion bonding, electron beam welding and linear friction welding. The aim of the project was to evaluate a number of different joining techniques in order to gain an understanding of the type of microstructures generated and, ultimately, the advantages and disadvantages of each technique. The diffusion bonding behaviour of the intermetallic compound Ti-48Al-2Mn-2Nb (at.%) was studied as a function of various parameters including; starting microstructure, temperature, surface finish and time. During diffusion bonding, small y-based grains nucleated at the interface and grew into the matrix forming a 'double necklace' grain structure. Backscattered electron imaging (BSEI) and transmission electron microscopy (TEM) identified the presence of oc 2 -based particles, both at along the original boundary and between the newly formed interfacial y grains and the matrix. The formation of a 2 particles was believed to be related to the redistribution of a 2 -stabilising elements, notably oxygen, during bonding. Post bond heat treatment in the a phase field («1400°C) was found to be an effective way of replacing the original double necklace grain structure with a fully lamellar structure that exhibited good grain growth across the original boundary. The electron beam weldability of the alloy was studied with particular emphasis on reducing cold cracking associated with the weldment cooling through the ductile to brittle transition temperature (DBTT) at approximately 700°C. It was found that the amount of cold cracking could be reduced and eliminated by reducing the cooling rate of the weldment through the DBTT via in-situ electron beam heating. Tensile testing of the welds showed that although the welds appeared to be crack-free they were considerably weaker than the matrix, this suggests the welds contained a high degree of residual stress. The application of different preheats to the samples produced a range of cooling rates within the weldment which proved ideal for studying the various transformation products of the high temperature a phase. The retained ot 2 , massively transformed y and wheatsheaf / feathery structures were all studied in detail by TEM, with particular emphasis on the oc-»massive y transformation. The analysis culminated with the proposal of a qualitative CCT curve for the various transformation products from the a phase. Analysis of the a -> massive y transformation suggests the massive phase developed in the parent a from a coherent, grain boundary nucleus which subsequently grew into an adjacent grain by movement of an incoherent interface. A feathery structure was also observed in the welds. This structure consisted of lamellar colonies that appeared to gradually Tan out' at angles between 1-30°. No conclusive results were obtained to explain how the feathery structure developed, although a number of mechanisms were proposed including; the growth of lamellae on distorted a planes, non-coherent growth and the growth of colonies via an intermediate massive transformation. Examination of linear friction welds identified the presence of three different types of microstructure. The high deformation associated with the forging cycle produced extensive dynamic recrystallisation at the weld centre. The microstructure within this region was predominantly fine grained equiaxed y (50-100 nm). Away from the weld centre the matrix appeared severely deformed, causing extensive twinning and bending of the original lamellar structure. In some cases, regions were observed containing a high density of oxide - nitride based particles indicating the welding parameters were insufficient to cause complete extrusion of flash material from the weld.
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Yan, Ping. "Diffusion bonding of titanium aluminide (TiAl)." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241177.

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Talon, Arnaud. "Contrôlabilité des alliages inter-métalliques Titane-Aluminium." Toulouse 3, 2005. http://www.theses.fr/2005TOU30234.

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Le travail présenté concerne la contrôlabilité des aluminures de titane TiAl élaborés par frittage. Cette étude porte sur la recherche de moyens de contrôle non destructifs (ultrasons, radiographie et tomographie X, ressuage) adaptés ou offrant de bonnes perspectives d'amélioration par des méthodes de traitement du signal. Des échantillons ont été réalisés avec des manques de matière mais aussi avec des inclusions réelles de différentes natures et formes. On a pu ainsi évaluer les avantages et inconvénients des méthodes proposées en fonction des différents défauts. Enfin une étude de l'influence des inclusions sur les propriétés mécaniques a été réalisée. Des méthodes de traitement du signal ont été appliquées pour améliorer la détectabilité des défauts par contrôle ultrasonore. Nous avons mis en œuvre des méthodes telles que l'analyse cepstrale, la transformation de Hilbert, des méthodes à haute résolution ainsi que des techniques de débruitage par la transformée en ondelettes.
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Millogo, Myriam. "Allumage, combustion et explosion des poudres d'aluminium, de titane et de leurs alliages." Thesis, Orléans, 2019. http://www.theses.fr/2019ORLE2006.

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Depuis ces dernières années, les procédés de fabrication par addition de matière commencent à faire leur apparition dans les entreprises occupant des secteurs à forte valeur ajoutée comme l’aéronautique, le spatial ou le secteur de l’armement. Ces procédés d’addition de matière mettent en oeuvre des poudres métalliques issues des alliages métallurgiques utilisés couramment dans l’industrie mécanique. Le projet EXPAALT a été développé sur la problématique du risque d’explosion autour des poudres d’aluminium, de titane et de leurs alliages et cette thèse s’inscrit dans ce contexte. Son objectif est de contribuer d’une part à la détermination des paramètres de sécurité de ces poudres, et d’autre part à la compréhension des mécanismes de combustion de celles-ci. Pour ce faire, onze poudres métalliques ont été sélectionnées dont quatre poudres pures et sept alliages. Leurs caractéristiques de combustion ont été étudiées dans une bombe sphérique de 20 litres et dans un tube d’Hartmann. A l’appui de ces dispositifs, des diagnostics optiques, en plus du capteur de pression de la sphère, comme un pyromètre IR à deux couleurs et un spectromètre UV-visible ont été utilisés. Les mécanismes de combustion ont été interprétés en combinant une approche thermodynamique à l’équilibre avec une caractérisation fine des produits de combustion. Les résultats obtenus ont montré que les poudres pures sont plus sensibles et plus sévères à l’explosion que leurs alliages. Dans les analyses des produits de combustion, il est noté la présence de phases cristallisées et de phases amorphes, permettant de mettre en évidence la complexité des mécanismes de formation des produits de combustion. Dans tous les cas de figure, il apparait que l’oxygène et l’azote sont deux réactifs lors de la combustion comme en témoigne l’analyse des produits. La proportion entre oxyde et nitrure est directement contrôlée par la richesse. Ces résultats fournissent des informations nouvelles sur la combustion des poudres pures étudiées et de leurs alliages, montrant la nécessité de faire évoluer les modèles de combustion
In recent years, the layer-by-layer manufacturing process seems to be used increasingly amongst the aeronautics, space or defense industries. These Additive Layer Manufacturing processes use metal powders from metallurgical alloys commonly used in the mechanical industry. The EXPAALT project was developed on the problematic of explosion risk around aluminum, titanium and their alloys powders. This thesis is part of this project and aims to contribute on the one hand to the determination of the safety parameters, and on the other hand to the comprehension of combustion mechanisms of these powders. For such, eleven metal powders were selected including four pure powders and seven alloys. Their combustion characteristics were studied in a 20 liter spherical bomb and in a Hartmann tube. In support of these devices, optical diagnostics, in addition to the pressure sensor of 20 liter spherical bomb, such as a two-color IR pyrometer and a UV-Visible spectrometer were used. The combustion mechanisms were interpreted by combining a thermodynamic equilibrium approach with the combustion products characterization. The results obtained in those different experimental configurations showed that pure powders are more sensitive and more severe to explosion than their alloys. In the combustion products analyzes, it is noted the presence of crystallized and amorphous phases witch showed the complexity of the mechanisms formation of combustion products. In all cases, it appears that oxygen and nitrogen are two reactants during combustion, as evidenced by the analysis of the products. The proportion between oxide and nitride is directly controlled by dust concentration. These results provided new information about the combustion of pure powders and their alloys and showed that we need to evolve combustion models
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Jeffers, Elizabeth Ann. "Reaction Synthesis of Titanium Aluminide / Titanium Diboride in-Situ Composites." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/35367.

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Reaction synthesis is a processing technique where the thermal activation energy needed to form a compound is provided by the exothermic heat of formation of the thermodynamically stable product. This type of synthesis has been used to form a variety of ceramics, intermetallics, and in-situ composites. In this work, the effects of changing the stoichiometry of the titanium aluminide matrix, and the effects of extrinsic reaction variables on the behavior of the reaction were studied and compared to theoretical predictions. It was shown that changing the stoichiometry of the titanium aluminide did have an effect on the measured heat of reaction; however this did not match the prediction. Changing the extrinsic variables of titanium and aluminum particle sizes also showed a significant effect on the behavior of the reaction.
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Tchoupe, Ngnekou Paul Ervé. "Microstructure, oxydation et propriétés mécaniques d’alliages intermétalliques à base de TiAl." Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0021/document.

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Deux nouveaux alliages à base de TiAl (le Ti-46Al-8Nb et le Ti-46Al-8Ta) développés dans le cadre du projet européen IMPRESS pour des applications dans les turbines aéronautiques de Rolls Royce plc. ont été étudiés au cours de ce travail de thèse. Ils ont été caractérisés du point de vue de leur microstructure, leur résistance à l'oxydation et leurs propriétés mécaniques en traction. La microstructure dite convolutée mise en œuvre lors des traitements thermiques effectués par différents partenaires du projet a été caractérisée par microscopie optique, microscopie électronique à balayage et en transmission. A la différence de la microstructure lamellaire classique dont les lamelles d'un même grain sont orientées dans la même direction, les grains convolutés possèdent plusieurs orientations des colonies de lamelles. Ces orientations multiples ont été attribuées aux orientations possibles des plans de la phase gamma (obtenue après transformation massive) sur lesquelles la phase a2 est susceptible de précipiter et de croître. Le comportement à l'oxydation isotherme de ces alliages a été étudié à 700°C sous air et il a été montré que les cinétiques d'oxydation de l'alliage au Nb sont inférieures à celles de l'alliage au tantale, traduisant ainsi le fait que le Nb confère d'avantage plus de résistance à l'oxydation que le Ta. La structure de la couche d'oxyde au bout de 50 h est faite de deux sous-couches dans le cas de l'alliage au Nb : une sous-couche externe riche en alumine amorphe et une sous-couche interne constituée d'alumine amorphe renfermant de nombreuses petites cristallites de rutile. Dans le cas de l'alliage au tantale, la couche d'oxyde après 50 h d'oxydation est constituée d'une monocouche d'oxyde amorphe riche en aluminium renfermant des cristallites de rutile. L'alliage au Nb présente 2 sous couches : une sous couche externe d'oxyde amorphe riche en aluminium et une sous couche interne d'oxyde amorphe renfermant des cristallites de rutile. Au bout de 1000 h d'oxydation, la composition et la structure des couches d'oxyde ont complètement changé. L'oxyde est complètement cristallisé et se présente sous forme de deux sous-couches dans le cas de l'alliage au Nb. Une sous-couche externe d'alumine gamma et une sous-couche interne de rutile. Quant à l'alliage au tantale, l'on a 3 ou 4 sous couches selon que l'oxyde se soit formé à partir des lamelles de la phase g ou de la phase a2. La sous-couche externe reste continue et uniforme, et est constituée par de l'alumine gamma. En suite l'on a une sous-couche également continue de rutile. Les deux sous-couches se mélangent sur une épaisseur d'environ 20 à 30 nm et forment ainsi une zone d'oxydes mixtes de rutile et d'alumine. Cette sous-couche d'oxydes mixte se prolonge jusqu'à l'interface dans le cas de l'oxydation des lamelles de la phase gamma. En revanche, dans le cas de l'oxydation des lamelles de la phase a2, une quatrième couche de rutile est présente en dessous de la couche d'oxyde mixte. Dans tous les cas, l'interface entre l'oxyde et le substrat est faite d'une couche continue de nitrures de titane après 1000 h d'oxydation. Ces nitrures sont très localisés après les temps d'oxydation courts (50 h). L'influence de la température et de la vitesse de déformation sur les propriétés mécaniques en traction a été étudiée, et il a été relevé que plusieurs modes de rupture présents dans la plage de température étudiée (25-900°C). Pour la vitesse de 10-4s-1, en dessous de 750°C la rupture est fragile et à partir de 800°C elle est ductile. Le domaine de transition ductile fragile a été donc établi entre 750 et 800°C pour cette gamme de vitesse de déformation. A vitesse de déformation plus faible (10-5s-1), les ductilités obtenues sont accrues et l'on atteint près de 1% de déformation à température ambiante. Les essais de fragilisation de l'alliage au Ta ont été réalisés par des essais de fluage interrompus et des recuits à 700°C sous différents environnements, suivis de la traction à froid. Il a été montré qu'indépendant du pré-traitement subi, la déformation plastique est complètement perdue. Cette perte de ductilité a été attribuée à la formation des précipités riches en Ta présents aux joints de grains et aux joints de lamelles des deux phases en présence. Lesdits précipités se forment par décomposition de la phase a2 et du rejet du Ta aux joints de grains et aux interfaces inter-lamellaires lors du maintient à 700°C
This study was performed within the frame-work of the European integrated IMPRESS project and two different new TiAl based alloys (namely Ti-46Al-8Nb and Ti-46Al-8Ta) were studied as potential materials for applications in low pressure turbine blades. They were characterized in terms of their microstructure, their oxidation resistance at service temperature (namely 700°C) and their tensile properties. The so-called convoluted microstructure (obtained during heat treatments performed by different project partners) has been characterized by optical microscopy, scanning electron microscopy and transmission electron microscopy. Unlike the classical lamellar microstructure in which the lamellae of a given grain are oriented in the same direction, the convoluted microstructure shows different orientations of lamellae colonies and these were attributed to the possible orientations of the (111) planes of the “gamma phase” (g-TiAl) obtained after massive transformation, on which the basal plane of the « alpha 2 phase” (a2-Ti3Al) is likely to precipitate and grow during heat treatments. Isothermal oxidation of these alloys was studied in air at 700°C and it was shown that the oxidation kinetics of the Nb-alloy is lower compared to that of the Ta-alloy, suggesting that niobium provides greater oxidation resistance compared to tantalum. The structure of the oxide layer after 50 h oxidation is made of two sub-layers in the case of the Nb-alloy, with an outer amorphous aluminum enriched oxide layer and an inner sub-layer made of amorphous aluminum enriched oxide containing many small crystallites of rutile. In the case of the Ta-alloy, after the same oxidation period of time, the oxide layer is made of a unique amorphous aluminum enriched oxide layer containing crystallites of rutile. After 1000 h of oxidation, the composition and structure of the oxide have completely changed. The oxide layer is now completely crystallized and is made of two sub-layers in the case of the niobium alloy, with an outermost gamma alumina (g-Al2O3) layer and an inner layer made exclusively of rutile (TiO2) crystallites. As for the alloy with tantalum, 3 or 4 sub-layers could be found depending on the initial phase of the substrate (g or a2) from which the oxide is formed. The same as for the previous alloy, the two external sub-layers are continuous with an outermost uniform g-Al2O3 and an inner sub-layer made of rutile crystallites. These two sub-layers are interconnected within a 20 to 30 nm thick sub-layer made of mixed oxides of gamma alumina and rutile. This sub-layer of mixed oxides extends to the interface with the substrate in front of “gamma phase” lamellae. When the oxidized lamellae are the ones of the “alpha 2 phase”, a fourth sub-layer of rutile is present below the mixed oxide layer. For the two alloys, a continuous layer of titanium nitride (TiN) is present at the interface between the oxide and substrate after 1000 h oxidation, while isolated nitrides are observed at the interface after shorter oxidation time (50 h). The influence of temperature and strain rate on tensile properties was investigated, and it was noted that within the temperature domain explored (25-900°C), several failure modes occur with increasing temperature. For a strain rate of 10-4s-1 the failure mode is brittle below 750°C and is ductile above 800°C. The brittle to ductile transition domain was then established between 750 and 800°C for this strain rate. At much lower strain rate (10-5s-1), the ductility increases significantly and reaches nearly 1% strain at room temperature. Embrittlement testing of the alloy with tantalum was also performed by doing interrupted creep tests and pre-annealed tests under different environments at 700°C. These tests where then followed by straining the samples to failure at room temperature. Regardless of pre-treatment, all the tested samples show a total loose of their ductility and the tensile tests resulted in their early failure in the elastic domain. This loose of ductility was attributed to the formation of tantalum enriched precipitates which are present at grain boundaries and also at the interface between the lamellae of the different phases of the substrate. Such precipitates are formed by decomposition of the "alpha 2 phase" and the rejection of tantalum at grain boundaries and at inter-lamellar interfaces during elevated temperature holding (700°C)
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Books on the topic "Aluminidy titanu"

1

Appel, Fritz, Jonathan David Heaton Paul, and Michael Oehring. Gamma Titanium Aluminide Alloys. Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527636204.

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Wiedemann, Karl E. Emittance, catalysis, and dynamic oxidation of Ti-14Al-21Nb. Langley Research Center, 1989.

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Kim, Young-Won, Wilfried Smarsly, Junpin Lin, Dennis Dimiduk, and Fritz Appel, eds. Gamma Titanium Aluminide Alloys 2014. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118998489.

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4

Godfrey, Stuart Paul. The joining of gamma titanium aluminide. University of Birmingham, 1996.

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Sankaran, Sankara N. Oxidation characteristics of Ti-14Al-21Nb alloy. Langley Research Center, 1990.

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Mantle, Andrew Langford. The machining of gamma titanium aluminide intermetallics. University of Birmingham, 1998.

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Trail, Stephen John. Fatigue of gamma based titanium aluminide alloys. University of Birmingham, 1996.

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Zhang, Han. Investigation of machinability of titanium aluminides. University of Birmingham, 1995.

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Lee, Sing Cheung David. Creep of single crystals of gamma-titanium aluminide. University of Birmingham, 1999.

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Sarosi, Peter Maxwell. An investigation of an orthorhombic titanium aluminide (Ti2A1Nb). University of Birmingham, 2002.

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Book chapters on the topic "Aluminidy titanu"

1

Froes, F. H., and C. Suryanarayana. "Titanium Aluminides." In Physical Metallurgy and processing of Intermetallic Compounds. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1215-4_8.

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Appel, F., and M. Oehring. "γ-Titanium Aluminide Alloys: Alloy Design and Properties." In Titanium and Titanium Alloys. Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527602119.ch4.

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Ghosh, Gautam. "Aluminium – Iron – Titanium." In Iron Systems, Part 1. Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-69761-9_13.

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Velikanova, Tamara, Mikhail Turchanin, Svitlana Ilyenko, Guenter Effenberg, Vasyl Tomashik, and Dmytro Pavlyuchkov. "Aluminium – Tantalum – Titanium." In Refractory metal systems. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88053-0_15.

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Cornish, Lesley, Gabriele Cacciamani, Damian M. Cupid, and Jozefien De Keyzer. "Aluminium – Carbon – Titanium." In Refractory metal systems. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88053-0_6.

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Bochvar, Natalia, Tatiana Dobatkina, Ol'ga Fabrichnaya, Volodymyr Ivanchenko, and Damian M. Cupid. "Aluminium – Chromium – Titanium." In Refractory metal systems. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88053-0_7.

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Xu, X. J., J. P. Lin, Laiqi Zhang, and Y. F. Liang. "Recent Development and Optimization of Forging Process of High Nb-TiAl Alloy." In Gamma Titanium Aluminide Alloys 2014. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118998489.ch10.

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Shen, Zhengzhang, Yongfeng Liang, Laiqi Zhang, Guojian Hao, Jianping He, and Junpin Lin. "Reaction Behavior During Heating of Multilayered Ti/Al Foils." In Gamma Titanium Aluminide Alloys 2014. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118998489.ch13.

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Li, Haizhao, and Ji Zhang. "High Nb Content TiAl Alloys Specified to Cast Process." In Gamma Titanium Aluminide Alloys 2014. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118998489.ch14.

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Reisgen, Uwe, Simon Olschok, and Alexander Backhaus. "Electron Beam Joining of γ-Titanium Aluminide." In Gamma Titanium Aluminide Alloys 2014. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118998489.ch15.

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Conference papers on the topic "Aluminidy titanu"

1

Tom Mathew, Nithin, and L. Vijayaraghavan. "Dry Deep Drilling of Titanium Aluminide." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50404.

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Intermetallic titanium aluminides are recognized as the possibly alloys for high performance aerospace and automobile application. There is an increasing interest of this material due to their extraordinary material properties. The understanding of the machinability of titanium aluminides during various metal cutting processes is very much essential for its wide acceptance over various fields of application. Drilling, with high aspect ratio is a key machining area to be explored because of its complex nature. In the present work, holes were drilled on a titanium aluminide intermetallic alloy with an aspect ratio of 9.37, focusing on the machinability under dry environment using coated and uncoated twist drill. Machinability investigations were evaluated based on the, thrust force, torque, surface integrity, chip morphology, burr formation and performance of the tool. From the results of thrust force and torque, it is revealed that the coated tool doesn’t show any significant advantages over the uncoated tool. The variation of chip shapes was observed as the depth progresses. Small ring shape, uniform and non-uniform roll back burr were observed as the cutting parameters are varied. The adherence of workpiece material on to the tool and various surface defects were observed under all cutting conditions.
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2

Shepherd, Dominique A., and Vijay K. Vasudevan. "The Effect of Molybdenum on the Creep Behavior of Orthorhombic Titanium Aluminides." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30660.

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The effect of molybdenum additions on the creep properties of two orthorhombic titanium aluminide materials, Ti-22Al-26Nb and Ti-22Al-24.5Nb-1.5Mo (% atomic fraction), has been investigated. Heat treatments below the beta transus temperature followed by a 16-hour ageing treatment produced similar microstructures. Using the similar microstructures (consisting of O laths in a B2 matrix with α2 dispersed at B2 grain boundaries) for the two compositions, tensile creep testing was conducted under stresses of 68 MPa, 160 MPa, and 197 MPa at temperatures of 590 °C and 760 °C. The creep results demonstrated the favorable effects of Mo on creep resistance in these orthorhombic titanium aluminides. Due to similar microstructures, results also suggested that improvements have been substructural, rather than purely microstructural, in nature.
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Hashish, Mohamed. "AWJ Milling of Gamma Titanium Aluminide." In ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84248.

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A study was undertaken to determine the feasibility of the AWJ process for controlled depth milling of gamma Titanium Aluminide tiles. It was demonstrated that milling can be accomplished to 0.025-mm accuracy. To overcome undercutting near rib roots, the jet was clock-angled at about 15 degrees to the vertical every set of passes. This allowed the milling to thin skins of about 0.5-mm. It was observed that as the material is milled, stresses were relieved and either deformation or cracking may result. Accordingly parts need to be annealed before milling. The milling to thin skins was successfully demonstrated on 150mm × 300-mm parts without adverse effects. Also, the process of milling of dual rib height was developed using dual mask approach. Abrasive particle embedding on the milled surfaces was observed to be about 0.15% of the area, but cleaning with plain waterjets showed that all embedded particles can be removed. A detailed economic analysis confirmed that the AWJ milling process is relatively inexpensive and highly productive. The complete cost of milling including mask cutting, overhead, capital, and running cost is less than $300/ft2.
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Chesnutt, J. C. "Titanium Aluminides for Aerospace Applications." In Superalloys. TMS, 1992. http://dx.doi.org/10.7449/1992/superalloys_1992_381_389.

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SARAVANAN, R. A., and S. MRIDHA. "TITANIUM ALUMINIDES - BY SURFACE MELTING." In Processing and Fabrication of Advanced Materials VIII. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812811431_0078.

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6

Davidson, D. E. "Designing with Gamma Titanium CAESAR Program Titanium Aluminide Component Applications." In Superalloys. TMS, 1996. http://dx.doi.org/10.7449/1996/superalloys_1996_545_553.

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7

Podob, Mark. "Chemical Vapor Deposition (CVD) Coatings for Protection of Jet Engine Components." In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-375.

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CVD coatings are thin films resulting from the chemical reaction between a gaseous phase and the heated surface of a substrate. Among the industries using CVD coating technology are electronics, tooling, fuel cogeneration, and aerospace. The electronics industry uses CVD to deposit semiconductor materials onto different substrates. For the tooling industry, titanium nitride (TiN), titanium carbide (TiC), or aluminum oxide (Al2O3) is deposited onto cutting or metal forming tools. These hardcoatings act as chemical and thermal barriers between the tool and workpiece. In the aerospace industry, CVD is used to deposit aluminide or chromide coatings onto jet engine blades and other hot section components. The coatings improve the corrosion and oxidation resistance of the base metal. CVD is replacing older established methods for protecting these same components. While the use of CVD coatings in the aerospace industry is relatively new, it is gaining increasing acceptance. In addition to producing aluminides and chromides, CVD reactions can form coatings containing silicon, yttrium, hafnium and other rare earth elements. Since the coatings are the result of the chemical reaction between high purity gases and solids, coatings can be free of porosity and inclusions.
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8

Khor, K. A. "Plasma Spray Processing of Titanium Aluminides." In International Pacific Air & Space Technolgy Conference. SAE International, 1994. http://dx.doi.org/10.4271/940054.

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Austin, C. M., and T. J. Kelly. "Gas Turbine Engine Implementation of Gamma Titanium Aluminide." In Superalloys. TMS, 1996. http://dx.doi.org/10.7449/1996/superalloys_1996_539_543.

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BHATT, DHANANJAY, TRENT LOGAN, and IRA VICTER. "Titanium aluminides development for NASP airframe applications." In 2nd International Aerospace Planes Conference. American Institute of Aeronautics and Astronautics, 1990. http://dx.doi.org/10.2514/6.1990-5261.

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Reports on the topic "Aluminidy titanu"

1

Gaspar, T. A., and L. E. Hackman. Direct Cast Titanium Aluminide Strip. Defense Technical Information Center, 1991. http://dx.doi.org/10.21236/ada231906.

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2

Dwivedi, Ajmer, and Jermaine Bradley. Mechanical Response of Titanium Aluminide (TiAl3). Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada544560.

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Ritchie, Robert O., and A. W. Thompson. Fracture Fundamentals in Titanium Aluminides. Defense Technical Information Center, 1997. http://dx.doi.org/10.21236/ada329586.

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Baeslack, William A., and III. Joining of Gamma Titanium Aluminides. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada413052.

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DeLuca, D. P., B. A. Cowles, F. K. Haake, and K. P. Holland. Fatigue and Fracture of Titanium Aluminides. Defense Technical Information Center, 1990. http://dx.doi.org/10.21236/ada226737.

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6

Chaudhury, Prabir K., and Dan Zhao. Atlas of Formability: Super alpha 2 Titanium Aluminide. Defense Technical Information Center, 1992. http://dx.doi.org/10.21236/ada268321.

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7

Hanrahan, R. J. Jr, K. C. Chen, and M. P. Brady. The effects of beryllium additions on the oxidation of nickel aluminide and titanium aluminide based intermetallics. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/307984.

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Hanrahan, R. J. Jr, K. C. Chen, and M. P. Brady. The effects of beryllium additions on the oxidation of nickel aluminide and titanium aluminide based intermetallics. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/290925.

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Larson, D. L., M. K. Miller, H. Inui, and M. Yamaguchi. Atom probe field ion microscopy of polysynthetically twinned titanium aluminide. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/650359.

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Miller, M. K., D. J. Larson, and K. F. Russell. Characterization of segregation in nickel and titanium aluminides. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/459428.

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