Bibliographies thématiques / Ti2AlNb alloys

Littérature scientifique sur le sujet « Ti2AlNb alloys »

Auteur : Grafiati
Publié le 5 mai 2023

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Articles de revues sur le sujet "Ti2AlNb alloys"

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Wu, Jie, Lei Xu, Rui Peng Guo, Zheng Guan Lu, Yu You Cui et Rui Yang. « Microstructure and Mechanical Properties of Powder Metallurgy Ti-22Al-24Nb-0.5Mo Alloys Joints with Electron Beam Welding ». Materials Science Forum 849 (mars 2016) : 321–26. http://dx.doi.org/10.4028/www.scientific.net/msf.849.321.

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In this work, a Ti2AlNb based intermetallic alloy with the composition of Ti–22Al–24Nb–0.5Mo (at. %) pre-alloyed powder was firstly produced by gas atomization, and then fully dense powder metallurgy (PM) Ti2AlNb alloy was prepared by a hot isostatic pressing (HIPing) procedure. The HIPed alloy shows uniform microstructure with low number of porosities. In order to broaden the application field of PM Ti2AlNb alloys, electron beam welding (EBW) was proposed to join the intermetallics. The joint quality, microstructure and microhardness of PM Ti2AlNb alloy processed by EBW were characterized, and the results showed that the both base alloy and EBW joints have high metallurgy quality.
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Hang, Ye Chao, Hong Yan Wu et Shi Juan Li. « Microstructure and Hot Corrosion Properties of Surface Plasma Alloyed Ti2AlNb-Based Alloys ». Advanced Materials Research 744 (août 2013) : 388–91. http://dx.doi.org/10.4028/www.scientific.net/amr.744.388.

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Some unsatisfactory characteristics of Ti2AlNb-based alloys restrict its practical application, such as the insufficient high temperature oxidation, corrosion resistance and poor wear resistance. The double glow plasma surface chromizing can improve their wear resistance, however the hot corrosion properties of surface plasma chromised Ti2AlNb-based alloys were little investigated. The microstructure, composition and surface hot corrosion morphologies of Ti2AlNb-based alloy were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD of alloying layer indicated that the Cr-Nb alloy phase was the main composition, including the compact and uniform Cr2Nb phase, which was benefit to improve the hot corrosion properties of alloy.
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Polozov, Igor, Kirill Starikov, Anatoly Popovich et Vadim Sufiiarov. « Mitigating Inhomogeneity and Tailoring the Microstructure of Selective Laser Melted Titanium Orthorhombic Alloy by Heat Treatment, Hot Isostatic Pressing, and Multiple Laser Exposures ». Materials 14, no 17 (30 août 2021) : 4946. http://dx.doi.org/10.3390/ma14174946.

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Titanium orthorhombic alloys based on intermetallic Ti2AlNb-phase are attractive materials for lightweight high-temperature applications. However, conventional manufacturing of Ti2AlNb-based alloys is costly and labor-consuming. Additive Manufacturing is an attractive way of producing parts from Ti2AlNb-based alloys. High-temperature substrate preheating during Selective Laser Melting is required to obtain crack-free intermetallic alloys. Due to the nature of substrate preheating, the temperature profile along the build height might be uneven leading to inhomogeneous microstructure and defects. The microstructural homogeneity of the alloy along the build direction was evaluated. The feasibility of mitigating the microstructural inhomogeneity was investigated by fabricating Ti2AlNb-alloy samples with graded microstructure and subjecting them to annealing. Hot isostatic pressing allowed us to achieve a homogeneous microstructure, eliminate residual micro defects, and improve mechanical properties with tensile strength reaching 1027 MPa and 860 MPa at room temperature and 650 °C, correspondingly. Annealing of the microstructurally graded alloy at 1050 °C allowed us to obtain a homogeneous B2 + O microstructure with a uniform microhardness distribution. The results of the study showed that the microstructural inhomogeneity of the titanium orthorhombic alloy obtained by SLM can be mitigated by annealing or hot isostatic pressing. Additionally, it was shown that by applying multiple-laser exposure for processing each layer it is possible to locally tailor the phase volume and morphology and achieve microstructure and properties similar to the Ti2AlNb-alloy obtained at higher preheating temperatures.
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Wang, Wei, Ziru Han, Qingjuan Wang, Baojia Wei, Shewei Xin et Yuan Gao. « Tribological Properties of Ti2AlNb Matrix Composites Containing Few-Layer Graphene Fabricated by Spark Plasma Sintering ». Metals 10, no 7 (9 juillet 2020) : 924. http://dx.doi.org/10.3390/met10070924.

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Ti2AlNb alloys with few-layer graphene were fabricated by spark plasma sintering (SPS) to enhance the tribological properties (TP) of the composite materials. Microstructure characteristics of the original few-layer graphene (FLG), Ti2AlNb powders, and the sintered composites were characterized by X-Ray Diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy. The experimental results indicated that FLGs were homogeneously distributed in the composites. Tribological results indicated that the coefficient of friction (COF) of the composites was reduced as the content of FLG increased. Compared with the pure Ti2AlNb alloy, the average COF of the composite with 1.0 wt.% FLG was decreased by 9.4% and the wear rate was decreased by 36%. Meanwhile, the microstructures of the worn surface showed that TiC particles and friction layers formed by residual FLGs were present on the surface of the composites after tribological test. It is proposed that Ti2AlNb alloys with FLGs presented the enhanced wear resistance.
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Li, Shi Qiong, Yun Jun Cheng, Xiao Bo Liang et Jian Wei Zhang. « Recent Work on Alloy and Process Development of Ti2AlNb Based Alloys ». Materials Science Forum 475-479 (janvier 2005) : 795–800. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.795.

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Ti2AlNb orthorhombic phase based alloys are the promising high temperature structural materials for aeronautical and aerospace industry because of their low density, high yield strength and excellent high temperature performance. In this paper, the recent work which has been carried out in CISRI on alloy and process of Ti2AlNb based alloys is presented. The work covers the development of the alloy design and microstructure control as well as the processing technology applied for producing good quality alloy ingots and fabricating various components. The progress obtained in application research of the alloys is addressed. The important role that the combination of TMP and the post-TMP treatment affects on the microstructure and thus on the properties of the alloys is emphasized.
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Chen, Wei, Lei Huang, Yaoyao Liu, Yanfei Zhao, Zhe Wang et Zhiwen Xie. « Oxidative Corrosion Mechanism of Ti2AlNb-Based Alloys during Alternate High Temperature-Salt Spray Exposure ». Coatings 12, no 10 (20 septembre 2022) : 1374. http://dx.doi.org/10.3390/coatings12101374.

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This study investigates the corrosion damage mechanisms of Ti2AlNb-based alloys under high temperature, salt spray and coupled high temperature-salt spray conditions. This alloy was analysed in detail from macroscopic to microscopic by means of microscale detection (XRD, SEM and EDS). The results indicated that Ti2AlNb-based alloy surface oxide layer is dense and complete, and the thickness is only 3 µm after oxidation at 650 °C for 400 h. Compared to the original sample, the production of the passivation film resulted in almost no damage to Ti2AlNb-based alloy after 50 cycles of salt spray testing at room temperature. The tests showed that Ti2AlNb alloy shows good erosion resistance at 650 °C and in salt spray. However, this alloy had an oxide layer thickness of up to 30 µm and obvious corrosion pits on the surface after 50 cycles of corrosion under alternating high temperature-salt spray conditions. The Cl2 produced by the mixed salt eutectic reaction acted as a catalytic carrier to accelerate the volatilisation of the chloride inside the oxide layer and the re-oxidation of the substrate. In addition, the growth of unprotected corrosion products (Na2TiO3, NaNbO3 and AlNbO4) altered the internal structure of the oxide layer, destroying the surface densification and causing severe damage to the alloy surface.
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Polozov, Igor, Anna Gracheva et Anatoly Popovich. « Interface Characterization of Bimetallic Ti-6Al-4V/Ti2AlNb Structures Prepared by Selective Laser Melting ». Materials 15, no 23 (30 novembre 2022) : 8528. http://dx.doi.org/10.3390/ma15238528.

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Additive Manufacturing (AM) of multimaterial components is a promising way of fabricating parts with improved functional properties. It allows for the combination of materials with different properties into a single component. The Ti2AlNb-based intermetallic alloy provides high temperature strength, while the Ti-6Al-4V (Ti64) alloy has good fracture toughness, ductility, and a relatively low cost. A combination of these alloys into a single component can be used to produce advanced multimaterial parts. In this work, Ti2AlNb/Ti-6Al-4V bimetallic structures were fabricated from pre-alloyed powders using the Selective Laser Melting (SLM) process. The effects of high-temperature substrate preheating, post-processing by annealing, and hot isostatic pressing on defect formation, the microstructural evolution of the interface area, and the mechanical properties of the bimetallic samples were investigated. High-temperature substrate preheating during the SLM process was necessary to prevent reheat cracking of the Ti2AlNb part, while annealing and hot isostatic pressing post-processing improved the chemical and microstructural homogeneity of the transition zone and enhanced the tensile properties of the bimetallic structure.
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Illarionov, Anatoliy G., Stepan I. Stepanov, Inna A. Naschetnikova, Artemiy A. Popov, Prasanth Soundappan, K. H. Thulasi Raman et Satyam Suwas. « A Review—Additive Manufacturing of Intermetallic Alloys Based on Orthorhombic Titanium Aluminide Ti2AlNb ». Materials 16, no 3 (20 janvier 2023) : 991. http://dx.doi.org/10.3390/ma16030991.

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Titanium alloys based on orthorhombic titanium aluminide Ti2AlNb are promising refractory materials for aircraft engine parts in the operating temperature range from 600–700 °C. Parts made of Ti2AlNb-based alloys by traditional technologies, such as casting and metal forming, have not yet found wide application due to the sensitivity of processability and mechanical properties in chemical composition and microstructure compared with commercial solid-solution-based titanium alloys. In the last three decades, metal additive manufacturing (MAM) has attracted the attention of scientists and engineers for the production of intermetallic alloys based on Ti2AlNb. This review summarizes the recent achievements in the production of O-phase-based Ti alloys using MAM, including the analysis of the feedstock materials, technological processes, machines, microstructure, phase composition and mechanical properties. Powder bed fusion (PBF) and direct energy deposition (DED) are the most widely employed MAM processes to produce O-phase alloys. MAM provides fully dense, fine-grained material with a superior combination of mechanical properties at room temperature. Further research on MAM for the production of critical parts made of Ti2AlNb-based alloys can be focused on a detailed study of the influence of post-processing and chemical composition on the formation of the structure and mechanical properties, including cyclic loading, fracture toughness, and creep resistance.
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Braun, R., et C. Leyens. « Protective coatings on orthorhombic Ti2AlNb alloys ». Materials at High Temperatures 22, no 3-4 (janvier 2005) : 437–47. http://dx.doi.org/10.1179/mht.2005.052.

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Jiao, Xueyan, Zhiqiang Liu, Yong Wu et Gang Liu. « Investigation on precision and performance for hot gas forming of thin-walled components of Ti2AlNb-based alloy ». MATEC Web of Conferences 190 (2018) : 07001. http://dx.doi.org/10.1051/matecconf/201819007001.

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Ti2AlNb-based alloys have received considerable attention as potential materials to replace the nickel alloy at 600-750 °C, depending on their advantages of high specific strength, good corrosion and oxidation resistance. To realize the precision and performance control for Ti2AlNb-based alloy thin-walled components, the microstructure evolution was analyzed for setting up the unified viscoplastic constitutive equations based on the physical variables and simulating the forming process coupled between the deformation and the microstructure evolution. Through the finite element model with coupling of microstructure and mechanical parameters, the microstructure evolution and shape fabricating can be predicted at the same time, to provide the basis for the process parameters optimization and performance control. With the reasonable process parameters for hot gas forming of Ti2AlNb thin-walled components, the forming precision and performance can be controlled effectively.
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Thèses sur le sujet "Ti2AlNb alloys"

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Mallick, Robin. « Effet des traitements thermomécaniques sur la microstructure d'un alliage de titane Ti2AlNb ». Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLM078.

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Grâce à leurs bonnes propriétés mécaniques jusqu’à 650 °C et une faible densité, les alliages de composition générique Ti2AlNb sont de bons candidats pour certaines applications aéronautiques. La mise en œuvre de ces alliages, depuis leur élaboration jusqu’à l’obtention, grâce aux traitements thermomécaniques, de la microstructure la mieux adaptée aux applications envisagées, nécessite cependant d’être optimisée avant qu’ils ne puissent être industrialisés. Cette étude a permis d’étudier les mécanismes de restauration et de recristallisation qui gouvernent l’évolution microstructurale d’un alliage Ti2AlNb pendant et après la déformation plastique relative au corroyage dans l’intervalle de température entre 1010 et 1204 °C afin de mieux maîtriser sa mise en forme à haute température. Plusieurs procédés de déformation plastique opérant dans les domaines de température, de vitesse de déformation et de déformation comparables à ceux dans lesquels sont classiquement réalisés les corroyages et la mise en forme industrielle ont été mis en œuvre.L’évolution dynamique de la microstructure a été analysée sur la base d’essais de compression et de torsion suivis par une trempe ; des essais de filage ont permis d’engendrer une première étape de recristallisation post-dynamique de l’alliage. Enfin, des traitements thermiques isothermes post-déformation ont permis d’étudier la recristallisation statique de l’alliage déformé. En caractérisant les microstructures par microscopie optique et par diffraction des électrons retrodiffusés (EBSD) en microscope électronique à balayage, l’effet des paramètres de déformation à haute température sur l’évolution microstructurale a été étudié. La recristallisation dynamique continue conduit à la formation d’une faible fraction volumique de grains recristallisés au voisinage des joints de grains. Une partie de ces grains feront office de germes pour la recristallisation post-dynamique ou pour la recristallisation statique. Les traitements thermiques isothermes post-déformation ont permis d’étudier la cinétique de la recristallisation statique et d’étudier les effets de la taille de grain avant déformation, de la température, et de la vitesse de déformation sur cette cinétique
Due to their excellent properties, especially, high temperature mechanical strength and low density, Ti2AlNb-based alloys are considered as promising materials for rotating parts in aircraft engines. Such properties are obtained through appropriate thermomechanical treatment which should result in optimal microstructure for a specific application. Different stages of thermomechanical treatments of Ti2AlNb alloys are still required to be optimized to guarantee the best alloys performance. Therefore, the understanding of microstructure evolution of Ti2AlNb alloys during high temperature processing is of particular industrial interest.The aim of the present work was to investigate the microstructure changes in a Ti2AlNb alloy induced by high temperature plastic deformation in the temperature range of 1010-1204 °C, in order to further optimize high temperature alloy processing. The dynamic evolution of the microstructure was analysed through compression and torsion tests followed by quenching, and hot extrusion tests were used to generate a first stage of post-dynamic recrystallization of the alloy. Finally, post-deformation isothermal heat treatments were used to study the static recrystallization phenomenon. The microstructure was characterized by means of optical microscopy and electron backscatter diffraction (EBSD) in scanning electron microscope. The effect of high-temperature deformation parameters on the microstructure evolution was studied. It is revealed that continuous dynamic recrystallization leads to the formation of a low volume fraction of recrystallized grains in the area close to the initial grain boundaries. Some of these grains will further become nuclei for post-dynamic or static recrystallization. Post-deformation isothermal heat treatments allowed to study the kinetics of static recrystallization and to investigate the effect of initial grain size, temperature and strain rate
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Chapitres de livres sur le sujet "Ti2AlNb alloys"

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Malecka, Joanna. « Oxidation Behavior of Orthorhombic Ti2AlNb Alloy ». Dans High Temperature Corrosion. InTech, 2016. http://dx.doi.org/10.5772/63998.

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Actes de conférences sur le sujet "Ti2AlNb alloys"

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Lin, Xin, Mocong Yang, Xiaojing Xu, Haiou Yang, Jing Chen et Weidong Huang. « Phase evolution in laser solid formed compositionally graded Ti60-Ti2AlNb alloys ». Dans ICALEO® 2009 : 28th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2009. http://dx.doi.org/10.2351/1.5061597.

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Wu, Yang Wu, Hong-Chao Kou, De-Gui Liu, Ji-Zhen LI Li et Bin Tang. « Finite Element Modeling of Power Spinning of Thin-walled Ti2AlNb Alloy Shell ». Dans 2nd Annual International Conference on Advanced Material Engineering (AME 2016). Paris, France : Atlantis Press, 2016. http://dx.doi.org/10.2991/ame-16.2016.195.

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Tang, Caixian, Stefan Gulizia et Mahnaz Jahedi. « Post Treatment of Cold Sprayed Metallic Ti-Al to Achieve Thick Ti2AlN Coating ». Dans ITSC2009, sous la direction de B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima et G. Montavon. ASM International, 2009. http://dx.doi.org/10.31399/asm.cp.itsc2009p0337.

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Abstract This paper presents a way of processing cold-sprayed Ti-Al to produce titanium aluminum nitride coatings. These coatings are meant to serve as a durable protective layer on tools exposed to molten aluminum alloys. A Ti-Al powder mixture with a weight ratio of 70/30 was cold sprayed onto specially prepared substrates using nitrogen as a process and powder delivery gas. The resulting coatings were alloyed at different temperatures to obtain a stabilized Ti-Al intermetallic phase for further nitriding treatment. The nitriding process was carried out in an ammonia-nitrogen atmosphere at 900 °C. The final product had a web-shaped microstructure with the same thickness as the cold-sprayed Ti-Al. Test samples were placed in molten aluminum for 1200 hours without notable chemical reaction.
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POLOZOV, Igor, Anatoly POPOVICH et Vadim SUFIIAROV. « effects of heat treatment and hot isostaTic pressing on microstructure and mechanical properties of ti2alnb-based alloy fabricated by slm ». Dans METAL 2021. TANGER Ltd., 2021. http://dx.doi.org/10.37904/metal.2021.4239.

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