Relevant bibliographies by topics / Intermetallics alloy TiAl

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Intermetallics alloy TiAl'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 February 2022

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Journal articles on the topic "Intermetallics alloy TiAl"

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Chen, Hua, Tian Yu Zhang, X. Y. Lu, Su Qiu Jia, and Zhi Long Chai. "A Study on Characteristics of TiH2-Al-Nb Alloyed Powder During High Energy Ball Milling." Materials Science Forum 688 (June 2011): 1–5. http://dx.doi.org/10.4028/www.scientific.net/msf.688.1.

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In this paper, TiH2-47Al-5Nb (at.%) and TiH2-47Al-7Nb(at.%) alloys were mixed and synthesized using TiH2, Al and Nb powders. The composition and morphology evolution of the mixed powder were systematically investigated during high energy ball milling. The results show obvious that structure change of the particle during milling, and amorphous, TiAl, Ti3Al and Ti2Al phases at nanoscale are formed. The addition of Nb shows an active influence on the decomposition of TiH2and formation of TiAl-intermetallics. Compare with Ti-Al system alloy, the forming process of TiAl-intermetallics for TiH2-Al-Nb system alloy is different and slower. Ti2Al metastable phase formed after ball milling for 15 h in our experiments.
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Jia, Lei, and Long Fan. "Effects of Hydrogen on Diffusion Bonding of TiAl-Based Intermetallics with Hydrogenated Ti6AI4V Alloy Interlayer Containing 0.5wt% Hydrogen." Advanced Materials Research 750-752 (August 2013): 624–29. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.624.

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The direct diffusion bonding of TiAl-based intermetallics and the diffusion bonding of TiAl-based intermetallics with hydrogenated Ti6Al4V alloys interlayer containing 0.5wt% hydrogen were carried out. The effects of hydrogen on diffusion bonding were investigated by SEM, EPMA, XRD, TEM and TG/DSC. The good joint was formed at 850°C for 15 min under a pressure of 15MPa at the diffusion bonding of TiAl-based intermetallics with hydrogenated Ti6Al4V alloy interlayer containing 0.5wt% hydrogen, and the room temperature shear strength was up to 290MPa. Relatived to direct diffusion bonding of TiAl-based intermetallic, the bonding parameters decreased prodigiously. According to the experimental observations, the Ti6Al4V alloy hydrogenated 0.5 wt% consisted of close-packed hexagonal structure α′ martensite phase, face-centered cubic structure of δ-phase, α and βH structure. The lamellar δ hydride and βH phase disappeared after bonding, and the lamellar (α+β) structure were formed. Because of the dehydrogenation during bonding, metastable hydride containing low hydrogen appeared. The remaining hydrogen in Ti6Al4V alloy at high temperatures enhanced the capacity of the plastic deformation and the diffusion ability of the alloy elements, which helped to improve the spread of the atom.
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Góral, Marek, Tadeusz Kubaszek, Marcin Kobylarz, Marcin Drajewicz, and Maciej Pytel. "Thermal Barrier Coating Deposited Using the PS-PVD Method on TiAl-Nb-Mo Intermetallic Alloy with Different Types of Bond Coats." Solid State Phenomena 320 (June 30, 2021): 60–65. http://dx.doi.org/10.4028/www.scientific.net/ssp.320.60.

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TiAl intermetallics can be considered an alternative for conventional nickel superalloys in the high-temperature application. A TBC (Thermal Barrier Coatings) with ceramic topcoat with columnar structure obtained using EB-PVD (electron beam physical vapour deposition) is currently used to protect TiAl intermetallics. This article presents the new concept and technology of TBC for TiAl intermetallic alloys. Bond coats produced using the slurry method were obtained. Si and Al nanopowders (70 nm) were used for water-based slurry preparation with different composition of solid fraction: 100 wt.% of Al, 50 wt.% Al + 50 wt.% Si and pure Si. Samples of TNM-B1 (TiAl-Nb-Mo) TiAl intermetallic alloy were used as a base material. The samples were immersed in slurries and dried. The samples were heat treated in Ar atmosphere at 1000 °C for 4 h. The outer ceramic layer was produced using the new plasma spray physical vapour deposition (PS-PVD) method. The approximately 110 μm thick outer ceramic layers contained yttria-stabilised zirconium oxide. It was characterised by a columnar structure. Differences in phase composition and structures were observed in bond coats. The coatings obtained from Al-contained slurry were approximately 30 μm thick and consisted of two zones: the outer contained the TiAl3 phase and the inner zone consisted of the TiAl2 phase. The second bond coat produced from 50 wt.% Al + 50 wt.% Si slurry was characterised by a similar thickness and contained the TiAl2 phase, as well as titanium silicides. The bond coat formed from pure-Si slurry had a thickness < 10 μm and contained up to 20 at % of Si. This suggests the formation of different types of titanium silicides and Ti-Al phases. The obtained results showed that PS-PVD method can be considered as an alternative to the EB-PVD method, which is currently applied for deposition a columnar structure ceramic layer. On the other hand, the use of nanopowder for slurry production is problematic due to the smaller thickness of the produced coating in comparison with conventional micro-sized slurries.
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Jang, Ok Jun, Cheol-Woong Yang, and Dong Bok Lee. "Transmission Electron Microscopy Characterization of Thermomechanically Treated Al3Ti–(8, 10, 15)% Cr Intermetallics." Microscopy and Microanalysis 19, S5 (August 2013): 89–94. http://dx.doi.org/10.1017/s1431927613012403.

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AbstractThe ordered L12-type Al3Ti–(8, 10, 15)% Cr intermetallic compounds, namely, Al67Ti25Cr8, Al66Ti24Cr10, and Al59Ti26Cr15, were prepared by induction melting followed by thermomechanical treatment. Their microstructure, compositional variation, and crystal structure were characterized using X-ray diffraction, optical microscopy, and scanning and transmission electron microscopy equipped with energy-dispersive spectroscopy. The Al67Ti25Cr8 alloy consisted of the L12-Al3Ti matrix and precipitates of α2-Ti3Al, D022-Al3Ti, and γ-TiAl. The Al66Ti24Cr10 and Al59Ti26Cr15 alloys consisted of the L12-Al3Ti matrix and grains of α-TiAl and β-Cr.
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Chen, Wen Zhe, Kai Ping Peng, Kuang Wu Qian, and Hai Cheng Gu. "Effects of Forming Processing on Mechanical Properties of Ti-48Al-2Mn-2Nb Intermetallics." Key Engineering Materials 297-300 (November 2005): 471–76. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.471.

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Ti-48Al-2Mn-2Nb alloy was produced by “centrifugal spray deposition” (CSD), and then hot isostatic pressing (HIP) was employed to remove the porosity formed by CSD. The effects of CSD and HIP processing on the mechanical properties and microstructure of the TiAl alloy were investigated. The results show that the CSD and HIP processing can both improve the strength, plasticity of the TiAl alloy, and the tensile elongation values of the CSD or HIP samples are around 3%, which are better than those of as-cast TiAl alloys in room temperature. Especially, they show more excellent compressive properties at ambient temperature with a compressive ratio of 33.8% and compressive strength of 2210MPa for the CSD samples, and a compressive ratio of 37.8% and compressive strength of 2348MPa for the HIP samples. The CSD processing also improves the fracture toughness of TiAl alloy, which is much higher than that of the HIP processing, while the HIP processing seems to be beneficial the ductility and plasticity as having a duplex structure. The effects of CSD and HIP processing on microstructure and properties of TiAl alloys are discussed to understand the deformation and fracture process of the alloy.
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Ramos, Ana Sofia, M. Teresa Vieira, Sonia Simões, Filomena Viana, and Manuel F. Vieira. "Joining of Superalloys to Intermetallics Using Nanolayers." Advanced Materials Research 59 (December 2008): 225–29. http://dx.doi.org/10.4028/www.scientific.net/amr.59.225.

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Joining nickel based superalloys to gamma-TiAl intermetallic alloys will contribute to a more efficient application of these advanced materials, particularly in extreme environments. In this study, Inconel alloy and gamma-TiAl are joined using as filler alternated nanolayer thin films deposited onto each base material. The nanolayers consisted in Ni/Al exothermic reactive multilayer thin films with periods of 5 and 14 nm deposited by d.c. magnetron sputtering in order to improve the adhesion to the substrates and to avoid the reaction between Ni and Al. Diffusion bonding experiments with multilayer coated alloys were performed under vacuum at 800°C by applying 50 MPa during 1h. Bonding was achieved in large areas of the centre of the joints where regions without cracks or pores were produced, especially when using multilayer thin films with a 14 nm modulation period.
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Beretta, Stefano, Mauro Filippini, Luca Patriarca, and Silvia Sabbadini. "Analysis of Fatigue Damage Accumulation in TiAl Intermetallics." Key Engineering Materials 592-593 (November 2013): 30–35. http://dx.doi.org/10.4028/www.scientific.net/kem.592-593.30.

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In this work, a Ti-48Al-2Cr-2Nb alloy obtained with a additive manufacturing technique by electron beam melting (EBM) has been examined by conducting high cycle fatigue tests both with plain specimens and with specimens with artificially introduced defects with the objective of studying the growth behavior of small cracks. A consistent model for predicting the fatigue endurance strength of specimens with artificial defects is proposed, based on the Kitagawa diagram and taking into account of the presence of inherent microstructural features of the studied intermetallic alloy. Thus, the origin of fatigue failures due to intermetallic phases and orientation of lamellar colonies was investigated by means of micromechanical analysis through the use of high-resolution Digital Image Correlation (DIC). The local strain heterogeneities were measured out of the load frame by means of an optical microscope at high magnifications. The strain maps were then overlaid with the images of the microstructure and detailed analyses were performed to investigate the features of the microstructure where high local strain heterogeneities arise. High local residual plastic strains were measured inside lamellar colonies, which are detected as the precursor to fatigue crack initiation. The measure of the residual strains also provides further information on the role of the intermetallic phases on the fatigue behaviour of γ-TiAl alloys.
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Zhang, Kai Feng, Shao Song Jiang, Zhen Lu, Guo Feng Wang, Chun Ping Zhang, and Ji Liang Yu. "Superplasticity of Nb-Si-Fe and TiAl Intermetallics Synthesized by Powder Metallurgy." Materials Science Forum 735 (December 2012): 113–19. http://dx.doi.org/10.4028/www.scientific.net/msf.735.113.

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Nb-16Si-2Fe alloy were processed by mechanical alloying (MA) and hot pressing sintering (HPS). Microstructure analysis revealed the presence of four phases: Nb solid solution (Nbss), three kinds of intermetallics Nb3Si, Nb5Si3 and Nb4Fe3Si5. The maximum elongation over 500% was obtained at 1450°C and strain rate of 2.31×10-4s-1. TiAl powder pre-alloyed was carried out on pulse current sintering equipment (PCS) with high heating rate. The effect of heating rate on microstructures and high temperature ductility was investigated. The results show that relatively high heating rate is beneficial for obtaining fine grained microstructures. And the resultant intermetallic alloy with equiaxed near gamma structures exhibits superplasticity at relatively low temperature.
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Simas, Pablo, Thomas Schmoelzer, Svea Mayer, Maria L. Nó, Helmut Clemens, and Jose San Juan. "Relaxation Processes at High Temperature in TiAl-Nb-Mo Intermetallics." MRS Proceedings 1516 (2012): 41–46. http://dx.doi.org/10.1557/opl.2012.1576.

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ABSTRACTIn the last decades there was a growing interest in developing new light-weight intermetallic alloys, which are able to substitute the heavy superalloys at a certain temperature range. At present a new Ti-Al-Nb-Mo family, called TNM™ alloys, is being optimized to fulfill the challenging requirements. The aim of the present work was to study the microscopic mechanisms of defect mobility at high temperature in TNM alloys in order to contribute to the understanding of their influence on the mechanical properties and hence to promote the further optimization of these alloys. Mechanical spectroscopy has been used to study the internal friction and the dynamic modulus up to 1460 K of a TNM alloy under different thermal treatments. These measurements allow to follow the microstructural evolution during in-situ thermal treatments. A relaxation process has been observed at about 1050 K and was characterized as a function of temperature and frequency in order to obtain the activation parameters of the responsible mechanism. In particular, the activation enthalpy has been determined to be H= 3 eV. The results are discussed and an atomic mechanism is proposed to explain the observed relaxation process.
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Song, X. G., J. Cao, H. Y. Chen, Y. F. Wang, and J. C. Feng. "Brazing TiAl intermetallics using TiNi–V eutectic brazing alloy." Materials Science and Engineering: A 551 (August 2012): 133–39. http://dx.doi.org/10.1016/j.msea.2012.05.002.

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Dissertations / Theses on the topic "Intermetallics alloy TiAl"

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Prehradná, Jana. "Úprava oxidačních vlastností TiAl intermetalik přetavováním povrchu v řízené atmosféře." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231717.

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Rešerše se zabývá teorií technologického způsobu zpracování materiálů, tzv. povrchového tavení. V první části rešerše je popsána samotná technologie a základní parametry ovlivňující proces tavení. Ve druhé části je uvedeno srování dvou základních typů laserů, a to Nd:YAG a CO2 laser. CO2 laser byl použit v případě našeho experimentu. Třetí část se zabývá vlastnostmi TiAl intermetalických slitin, především jejich fázemi -TiAl a -Ti3Al. Na závěr teoretické části je zmíněna oxidace TiAl intermetalických slitin. Experimentální část je věnována přetavování povrchu slitiny Ti-46Al-0,7Cr-0,1Si-7Nb-0,2Ni, a to v ochranné atmosféře dusíku. Tato část obsahuje výsledky několika experimentů, na jejichž základě bylo nutné stanovit potřebné parametry pro požadovaný proces tavení. Posledním krokem experimentu byla snaha o zvýšení hmotnosti vzorků v důsledku následné oxidace.
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Bird, Nigel. "The mechanical properties of #gamma#-TiAl based single crystals." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244598.

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Manesh, Saeed Heshmati. "Phase transformation and thermomechanical treatment of TiAl based alloys containing silicon." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307035.

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Chen, Weijie. "Microstructure modification and mechanical behaviour of an investment cast near ã-TiAl intermetallic alloy." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0016/NQ57605.pdf.

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Chen, Weijie Carleton University Dissertation Engineering Mechanical and Aerospace. "Microstructure midification and mechanical behaviour of an investment cast near gamma-TiAl intermetallic alloy." Ottawa, 2000.

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Wang, Zhiqi. "Study of Ti-Al-Cr oxidation resistant coatings for γ-TiAl based intermetallic alloys." Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/844155/.

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Magnetron sputter deposition with single target materials was used to produce amorphous and crystalline Ti-A1-(Cr) alloy coatings on a Ti-50Al substrate. The following coatings were studied: Ti-50Al-10Cr, Ti-53Al-15Cr, Ti-50Al-20Cr and Ti-48Al. The microstructures of the coatings were studied in the as deposited condition and after devitrification and heat treatment. A random distribution of nano-precipitates was formed in amorphous as-deposited coatings. Columnar features were present when the as-received deposit had crystallised during sputter deposition. If crystallization occurred during deposition, a columnar microstructure formed with the columnar fibres being parallel to the deposition direction. For the Ti-50Al-10Cr and Ti-53Al-15Cr deposits, the crystalline domains consisted of lamellar gamma // alpha, i.e. the crystalline deposits had a gamma // alpha texture. The alpha → alpha transformation occurred during deposition. Phase competition in the alloys was studied by combining thermodynamic modelling and transformation kinetics. At 1173K, the Ti-50Al-10Cr alloy transformed to a two-phase microstructure, consisting of the gamma and C14 Ti(Al, Cr)2 phases. The Ti-53Al-15Cr alloy transformed to a three-phase microstructure, consisting of the gamma, tau and the C14 Laves phase. The gamma and tau phases were mixed finely, with gamma // tau. The Ti-50Al-20Cr alloy transformed to a two-phase microstructure, consisting of the gamma and the Cl4 Laves phase. No orientation relationship between the gamma and the C14 Laves phase was observed. Phase evolution studies at lower temperatures in the range 773K to 973K indicated that for the amorphous Ti-48Al alloy, the phase transformation path is: the amorphous phase → alpha → gamma + alpha/alpha2. A fine lamellar structure was formed, with gamma being the dominant phase. For the Ti-50Al-20Cr alloy, the phase transformation path was: the amorphous phase → gamma → gamma + Ti(Al, Cr)2. The experimental observations and the modelling results have clearly suggested a tendency of amorphous phase stabilisation via Cr addition. Thermodynamic modelling also indicated that the driving force for amorphous alloy formation is not much less than that for the precipitation of disordered solution phases. Kinetically, the amorphous phase formation during sputter deposition is related to the suppression of surface diffusion at low substrate temperatures. The temperature processing window for ordered phase formation in the Ti-Al(-Cr) alloys during magnetron sputter deposition was evaluated by the effective diffusion distance. Time dependent nucleation calculations showed that in the Ti-48Al amorphous alloy, it would be kinetically easier to precipitate the alpha phase than the gamma phase. In the case of the Ti-50Al-20Cr alloy, the gamma phase forms in preference of alpha, which is consistent with experimental observations. Diffusion phenomena at the coating/substrate interface and the oxidisation of the coatings were also studied. The experimental Cr diffusion profiles and the simulations for the Ti-Al-Cr coatings and the Ti-50Al substrate indicated that diffusion at 1173K is reasonably slow. The Ti-50Al-10Cr, Ti-53Al-15Cr and the Ti-50Al-20Cr coatings could form protective oxide scales at 1173K. When a columnar structure was present in the crystalline deposit, cracking of the coating was observed when the coating was subject to thermal cycling from elevated temperatures. It is concluded that if cracking of the coatings was to be avoided, amorphous deposits should be preferred.
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Zollinger, Julien. "Influence de l'oxygène sur le comportement à la solidification d'aluminiures de titane binaires et alliés au niobium basés sur le composé intermétallique [gamma]-TiAI." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL032N/document.

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Cette étude s’inscrit dans le cadre du projet européen IMPRESS, "Intermetallic Materials Processing in Relation to Earth and Space Solidification". Elle porte sur la compréhension des mécanismes fondamentaux qui contrôlent la solidification de l’alliage Ti-46Al-8Nb envisagés pour le développement d’aubes de turbines. La première partie de cette étude caractérise l’influence de l’oxygène sur le comportement à la solidification d’alliages de base TiAl coulés et contenant de 40 a 48 at.% d’aluminium. L’addition d’oxygène augmente la fraction volumique de phase [alpha] formée pendant la solidification péritectique et conduit au changement de la phase primaire de solidification de la phase [bêta] à la phase [alpha] dans les alliages ternaires Ti-44,3Al-1,5O, Ti-47,7Al-0,8O et Ti-47,3Al-1,5O (at.%). Les coefficients de partage pour l’aluminium et l’oxygène kAl[alpha]/l= 0,9 et kO[alpha]/l = 1,29, ont été déterminés pour l’alliage ayant [alpha] comme phase primaire de solidification. Dans un deuxième temps, l’étude du comportement à la solidification de l’alliage Ti-46Al-8Nb, est décrite en portant une attention particulière sur les effets de la contamination et des conditions de croissance sur la formation des microstructures et des microségrégations. Deux comportements différents ont été mis en évidence : dans la phase primaire de solidification [alpha] rencontrée pour des hauts niveaux de contamination en oxygène, une très faible rétrodiffusion est observée. Pour de faibles quantités d’oxygène, la phase primaire de solidification est la phase [bêta]. Dans ce cas la présence d’oxygène induit une augmentation de l’amplitude de ségrégation malgré une forte rétrodiffusion dans la structure cubique centrée
This study was performed in the framework of the IMPRESS, "Intermetallic Materials Processing in Relation to Earth and Space Solidification", and is dedicated to the understanding of the fundamental mechanisms that control solidification in a Ti-46Al-8Nb alloy selected for TiAl-based alloy turbine blade development. The first part of this work is devoted to study the influence of oxygen on the solidification behaviour of cast TiAl-based alloys containing from 40 to 48 at.% of Al. Increasing the oxygen content affects significantly the macrostructure of the as-cast ingots, increases volume fraction of the phase formed during the peritectic solidification and leads to a change of the [bêta] primary solidification phase to the [alpha] phase in the ternary Ti-44.2Al-1.4O, Ti-47.3Al-0.9O and Ti-47.2Al-1.5O (at.%) alloys. When [alpha] is the primary solidification phase, the partition coefficients has been determined as kAl[alpha]/l= 0,9 and kO(alpha]/l = 1,29. In a second part, the solidification behaviour of Ti-46Al-8Nb alloy is investigated, with a particular attention to the contamination and growth conditions effects on microstructures and microsegregation formations. For high contamination levels, the solidification phase is [alpha] where oxygen reduces solute mobility, leading to limited backdiffusion. In low oxygen containing alloys, [bêta] is the primary solidification phase, and oxygen leads to an extent of the segregation amplitude despite high level of back-diffusion in the bcc structure
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Partaix, Axelle. "Contribution à l'étude de quelques transformations de phases dans des alliages à base TiAl." Rouen, 1996. http://www.theses.fr/1996ROUES060.

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L'objet de ce travail est d'apporter une meilleure connaissance des caractéristiques microstructurales et chimiques des intermétalliques à base TiAl ainsi que des mécanismes qui gouvernent certaines transformations de phases intervenant dans ces alliages. La première partie de l'étude concerne le rôle de l'oxygène, facteur réputé comme déterminant, sur la ductilité à température ambiante des alliages TiAl. Deux résultats importants ont été établis : i) la localisation préférentielle de l'oxygène dans la phase alpha deux et ii) la solubilité maximale de l'oxygène de l'ordre de trois cents ppm atomiques dans la phase gamma à l'équilibre. L'influence de différents paramètres (stoechiométrie des phases, teneur globale en oxygène, addition d'un troisième élément) sur cette solubilité a été étudiée. L'interprétation de ces résultats en terme d'environnement chimique des sites interstitiels favorables à la localisation de l'oxygène a été proposée. Deux transformations de phases ont été étudiées dans la deuxième partie : la formation de la phase alpha deux dans la structure lamellaire et la transformation massive de alpha en gamma. A partir des résultats expérimentaux, le rôle de l'oxygène est discuté vis-à-vis des mécanismes régissant ces transformations. En particulier, l'oxygène conduit à la présence de fautes dans la phase gamma massive et empêche la transformation massive d'être complète. Dans la dernière partie, le rôle des éléments d'addition et leur répartition entre les phases sont étudies dans un alliage quaternaire biphasé (alpha deux+gamma) contenant du chrome et du niobium. Une interprétation du comportement à la fois gamma-phile et alpha-deux gène du niobium a été donnée à partir de la forme des lobes de solubilité dans les coupes isothermes de diagrammes ternaires.
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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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Chen, Yao-Tang, and 陳耀堂. "The Study of Infrared Brazing TiAl/Ti3Al Intermetallics and Ti-6Al-4V Alloy." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/39241607532828165902.

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碩士
國立臺灣大學
材料科學與工程學研究所
96
Infrared vacuum brazing γ-TiAl/Ti-6Al-4V and α2-Ti3Al/ Ti-6Al-4V two kinds of samples using three Ti-based fillers: 60Ti-15Cu-25Ni, 70Ti-15Cu-15Ni and 40Ti-20Zr-20Cu-20Ni. For 60Ti-15Cu-25Ni and 70Ti-15Cu-15Ni fillers to braze γ-TiAl and Ti-6Al-4V, their brazed zone microstructures are quite similar. Next to γ-TiAl base metal, two layers are formed: one is composed of α2-Ti3Al+γ-TiAl lamellar mixtures and the other is a continuous α2-Ti3Al layer. The residual filler in the brazed zone is composed of Ti2Ni and Ti2Cu in which the decrement of residual filler can be achieved by increasing the brazing time and/or temperature. However, the thicknesses of the continuous α2-Ti3Al layer and α2-Ti3Al+γ-TiAl lamellar do not change by using different brazing conditions. When the residual filler is still existence, the crack will form in it and propagate until the sample failure. If the residual filler is already eliminated, the crack will form in the continuous γ-TiAl layer. For α2-Ti3Al/ Ti-6Al-4V sample, as compared to γ-TiAl/Ti-6Al-4V sample, there is no α2-Ti3Al+γ-TiAl lamellar and no a continuous α2-Ti3Al layer. When using 40Ti-20Zr-20Cu-20Ni filler, the brazed zone becomes more complicated. The most distinctive point is the residual filler can be composed of three intermetallics. The crack is also formed in the residual filler and then propagate until the sample failure. Because the Zr atoms are difficult to diffuse directly into two base metals, no matter how high of brazing temperature and how long of brazing time, the residual filler will not disappear. However, shear stress in this case can reach about 390MPa.
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Book chapters on the topic "Intermetallics alloy TiAl"

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Cheng, T. T., D. Hu, M. H. Loretto, and I. P. Jones. "γ-TiAl Alloy Development." In Intermetallics and Superalloys, 246–50. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607285.ch42.

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Pérez, Pablo, and Paloma Adeva. "Effect of the Alloy Microstructure on the Oxidation Behaviour of TiAl Based Alloys." In Intermetallics and Superalloys, 194–99. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607285.ch33.

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Zhang, D., V. Güther, N. Eberhardt, H. Kestler, and H. Clemens. "Control of Fully Lamellar Microstructures in a γ-TiAl Based Alloy." In Intermetallics and Superalloys, 134–39. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607285.ch23.

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Chatterjee, A., U. Bolay, U. Sattler, and H. Clemens. "Adjustment of Differently Spaced Fully Lamellar Microstructures in a γ-TiAl Based Alloy and their Creep Behaviour." In Intermetallics and Superalloys, 233–39. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607285.ch40.

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Shao, G., and P. Tsakiropoulos. "A Crystallographic Study of TiAl-Cr Alloys." In Intermetallics and Superalloys, 330–35. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607285.ch56.

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Hageneder, P., R. Pippan, W. Knabl, H. Clemens, and B. Tabernig. "Fatigue Crack Propagation in Two γ-TiAl Sheet Alloys." In Intermetallics and Superalloys, 129–33. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607285.ch22.

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Zhang, W. J., G. L. Chen, and F. Appel. "Effect of Nb Addition on the Phase Transformation of Gamma-TiAl Alloys." In Intermetallics and Superalloys, 362–67. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607285.ch61.

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Gouthama, P. Sivagnanapalani, and M. Sujata. "Composition Analysis of Diffusion Bonded y-TiAl Intermetallic: TiAlV Alloy Interface by Using STEM." In Supplemental Proceedings, 947–53. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118356074.ch119.

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Habel, Ulrike, Falko Heutling, Claudia Kunze, Wilfried Smarsly, Gopal Das, and Helmut Clemens. "Forged Intermetallic γ-TiAl Based Alloy Low Pressure Turbine Blade in the Geared Turbofan." In Proceedings of the 13th World Conference on Titanium, 1223–27. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119296126.ch208.

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Knippscheer, Sven, and Georg Frommeyer. "Intermetallic TiAl(Cr,Mo,Si) Alloys for Lightweight Engine Parts - Structure and Properties." In Materials for Transportation Technology, 12–18. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527606025.ch3.

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Conference papers on the topic "Intermetallics alloy TiAl"

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Patriarca, Luca, Can Içöz, Mauro Filippini, and Stefano Beretta. "Microscopic Analysis of Fatigue Damage Accumulation in TiAl Intermetallics." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-27091.

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In order to design efficient and light components for the aircraft industry preserving the safety of the design, more sophisticated design criteria are required for the application of new materials. In particular, the usage of novel manufacturing processes to produce advanced materials such as the gamma titanium aluminide alloys (γ-TiAl) requires the investigation of the microstructure influence in the fatigue damage accumulation processes. In this work we examine a Ti-48Al-2Cr-2Nb alloy obtained with an additive manufacturing technique by Electron Beam Melting (EBM) by conducting monotonic and fatigue experiments both on tension and compression samples. The full-field residual strain maps corresponding to different applied stress levels and number of cycles are obtained through the use of high-resolution Digital Image Correlation (DIC). The strain maps were overlaid with the images of the microstructure and detailed analyses were performed to investigate the features of the microstructure where high local strain heterogeneities arise. High local residual plastic shear strains were measured inside lamellar colonies, which are detected as the precursor to fatigue crack initiation. The measure of the residual strains also provides further information on the role of the intermetallic phases on the fatigue behavior of γ-TiAl alloys.
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Kumar, Amar N., Amiya Nayak, Alka Srivastava, Udit K. Roy, and Prakash C. Patnaik. "TiAl Intermetallics for Aerospace Applications: Fracture Resistance and Cracking Mechanisms." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59566.

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Research on TiAl aluminides has been undertaken to further advance the understanding of deformation and fracture mechanisms, vis-a`-vis the heat treatment effects on microstructure, fracture resistance and cracking mechanisms. Two TiAl grades considered comprise of Al-Nb-Mn-Cr-Bal Ti with two different microstructures, namely duplex and lamellar types. The size of colonies in fully lamellar structure also varied widely from 50 micron to 700 microns. Fracture toughness and crack growth resistance are studied under three point bend loading of SEN specimens at room temperature and at higher temperatures (700 °C and 900°C). The fracture resistance behavior for the intermetallics is studied following two methods, namely fracture toughness and crack growth resistance curves (KI vs. Δa). An appreciable improvement (around 50 percent) at 700°C is observed as compared to room temperature data. The crack size analysis is done by elastic compliance method and a normalized compliance curve (NCC) with a power law function for the aluminides is obtained irrespective of temperature. The mechanism of crack initiation as well as crack growth in different microstructures of the alloy is looked into to get an insight of the deformation and cracking process. In lamellar microstructure, colony boundaries appear to be the most preferred path for the crack growth, while multiple cracking mechanisms is observed in duplex structure.
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Tian, Zongjun, Lida Shen, Zhidong Liu, and Yinhui Huang. "Microstructure Characteristics and High-Temperature Oxidation Behavior of Plasma-Sprayed and Laser-Remelted MCrAlY Coatings on TiAl Intermetallics." In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50145.

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In order to further improve the high-temperature oxidation resistance of TiAl intermetallic alloys, MCrAlY coatings were fabricated by plasma spraying and plasma spraying-laser remelting technologies. The microstructures of the as-sprayed and laser-remelted MCrAlY coatings were studied. In addition, the oxidation behaviors at 850 °C for three samples were investigated. One sample is the matrix of TiA1 intermetallic alloys, the other one is processed by plasma-spraying MCrAlY coatings, and the third one is processed by plasma-spraying and laser-remelting MCrAlY coatings. It was revealed that the oxidation resistance of TiAl intermetallics is weak due to lack of protection of Al2O3 film formed on the surface. The plasma-sprayed MCrAlY coatings have better oxidation resistance than the TiAl intermetallics although the plasma-sprayed MCrAlY coatings have high density of porosity and a typical layered structure. It is demonstrated that most of the holes can be eliminated by laser remelting, leading to the best oxidation resistance of the third sample with the laser-remelted coatings. The high oxidation resistance of the laser-remelted coatings is mainly attributed to three aspects: firstly, an Al enriched zone on the coating surface is formed during laser remelting, which is transformed into a protective Al2O3 film during oxidation process. Secondly, laser remelting eliminates most of the defects in plasma-sprayed coatings and enhances its density, thus decreases the channel of oxidation diffusion in high temperature oxidation process. Thirdly, rapid cooling of laser remelting results in a grain refinement and a preferred oxidation of Al at the initial stage, leading to a reduction of oxidation rate.
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Beranoagirre, A., L. N. López de Lacalle, and Vicente Jesus Segui. "Milling of gamma TiAl intermetallic alloys." In THIRD MANUFACTURING ENGINEERING SOCIETY INTERNATIONAL CONFERENCE: MESIC-09. AIP, 2009. http://dx.doi.org/10.1063/1.3273661.

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Beranoagirre, A., and L. N. López de Lacalle. "Turning of gamma TiAl Intermetallic alloys." In THE 4TH MANUFACTURING ENGINEERING SOCIETY INTERNATIONAL CONFERENCE (MESIC 2011). AIP, 2012. http://dx.doi.org/10.1063/1.4707605.

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Beranoagirre, A., D. Olvera, L. N. López de Lacalle, G. Urbicain, Francisco Chinesta, Yvan Chastel, and Mohamed El Mansori. "DRILLING OF INTERMETALLIC ALLOYS GAMMA TIAL." In INTERNATIONAL CONFERENCE ON ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES (AMPT2010). AIP, 2011. http://dx.doi.org/10.1063/1.3552313.

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Pambudi, Muhammad Jajar, Eddy Agus Basuki, and Djoko Hadi Prajitno. "Improving hot corrosion resistance of two phases intermetallic alloy α2-Ti3Al/γ-TiAl with enamel coating." In PROCEEDINGS OF THE 1ST INTERNATIONAL PROCESS METALLURGY CONFERENCE (IPMC 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4974444.

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Yuriy, Belokon, Zherebtsov Aleksandr, and Belokon Karina. "The investigation of nanostructure formation in intermetallic γ-TiAl alloys." In 2017 IEEE International Young Scientists Forum on Applied Physics and Engineering (YSF). IEEE, 2017. http://dx.doi.org/10.1109/ysf.2017.8126640.

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Petrushynets, Lidiia V., Iurii V. Falchenko, Anatolii I. Ustinov, Oleh O. Novomlynets, and Svitlana M. Yushchenko. "Vacuum Diffusion Welding of Intermetallic Alloy ɣ-TiAl with High-Temperature Alloy EI437B Through Nanolayered Interlayers." In 2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON). IEEE, 2019. http://dx.doi.org/10.1109/ukrcon.2019.8879918.

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Wang, Hua Ming, L. G. Yu, X. X. Li, and P. Jiang. "Microstructure and wear resistance of laser-surface-carbonized TiC/TiAl composite coating on a gamma-TiAl intermetallic alloy." In International Symposium on Industrial Lasers, edited by Fuxi Gan, Horst Weber, Zaiguang Li, and Qingming Chen. SPIE, 1999. http://dx.doi.org/10.1117/12.361109.

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