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Academic literature on the topic 'Co-Ni-Al- Mo-Ta'

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Published: 6 September 2023

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Journal articles on the topic "Co-Ni-Al- Mo-Ta"

Inoue, Akihisa, Bao Long Shen, and Akira Takeuchi. "Syntheses and Applications of Fe-, Co-, Ni- and Cu-Based Bulk Glassy Alloys." Materials Science Forum 539-543 (March 2007): 92–99. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.92.

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This paper reviews our recent results of the formation, fundamental properties, workability and applications of late transition metal (LTM) base bulk glassy alloys (BGAs) developed since 1995. The BGAs were obtained in Fe-(Al,Ga)-(P,C,B,Si), Fe-(Cr,Mo)-(C,B), Fe-(Zr,Hf,Nb,Ta)-B, Fe-Ln-B(Ln=lanthanide metal), Fe-B-Si-Nb and Fe-Nd-Al for Fe-based alloys, Co-(Ta,Mo)-B and Co-B-Si-Nb for Co-based alloys, Ni-Nb-(Ti,Zr)-(Co,Ni) for Ni-based alloys, and Cu-Ti-(Zr,Hf), Cu-Al-(Zr,Hf), Cu-Ti-(Zr,Hf)-(Ni,Co) and Cu-Al-(Zr,Hf)-(Ag,Pd) for Cu-based alloys. These BGAs exhibit useful properties of high mechanical strength, large elastic elongation and high corrosion resistance. In addition, Fe- and Co-based glassy alloys have good soft magnetic properties which cannot be obtained for amorphous and crystalline type magnetic alloys. The Feand Ni-based BGAs have already been used in some application fields. These LTM base BGAs are promising as new metallic engineering materials.

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Park, Si-Jun, Seong-Moon Seo, Young-Soo Yoo, Hi-Won Jeong, and HeeJin Jang. "Statistical Study of the Effects of the Composition on the Oxidation Resistance of Ni-Based Superalloys." Journal of Nanomaterials 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/929546.

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The effects of alloying elements (Co, Cr, Mo, W, Al, Ti, and Ta) on the oxidation resistance of Ni-based superalloys are studied using the Response Surface Methodology (RSM). The statistical analysis showed that Al and Ta generally improve the oxidation resistance of the alloy, whereas Ti and Mo degrade the oxidation resistance. Co, Cr, and W did not alter oxidation rate significantly when examined by the mass gain averaged for all model alloys. However, it is remarkable that the degree of the effects of alloying elements varied with the concentration of other elements. Further, the effect of each element was sometimes found to be reversed for alloy groups specified by the concentration of another element.

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Hahn, Junhee, Xiao Xiao, and Dong Bok Lee. "Oxidation of Ni-Cr-Co-Al-Mo-Ti-Re-Ta-W-Ru Single Crystals at 1000 ^oC in Air." Korean Journal of Metals and Materials 58, no. 4 (April 5, 2020): 234–46. http://dx.doi.org/10.3365/kjmm.2020.58.4.234.

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Three kinds of Ni-based single crystals with the compositions of 63.8Ni-7.5Cr-5.1Co-4.8Al-1.9Mo- 0.9Ti-3Re-11.8Ta-1.2W, 61.4Ni-7.4Cr-5Co-4.8Al-1.8Mo-0.9Ti-3.1Re-11.6Ta-4W, and 60.9Ni-7.5Cr-5Co-4.8Al- 2Mo-1Ti-2.9Re-10.9Ta-1.2W-3.8Ru, in wt%, were cast in a Bridgman furnace. In the cast alloys, Cr, Co, Re, Mo, W, and Ru became microsegregated in dendrites consisting of γ-Ni, while Ni, Ta, and Al microsegregated in interdendrites consisting of eutectic γ/γ . The cast alloys were oxidized at 1000 oC up to 275 h in air to study the effect of alloying elements on high-temperature oxidation. The oxide scales consisted primarily of CrTaO4, with some NiCr2O4, NiO, and α-Al2O3. The oxidation resistance was dependent on the formation and continuity of the α-Al2O3 scale. Ta and W were beneficial, while Ru was harmful in improving the oxidation resistance. The selective oxidation of Al in dendrites led to the formation of thin, uniform α-Al2O3 scales, i.e., uniform oxidation. The competitive oxidation of active elements such as Al, Ti, and Ta in interdendrites led to the formation of porous, crack-susceptible oxide nodules, i.e., nodular oxidation. Less active elements such as Ru, Re, Ni, Co, Mo, W, and Cr tended to enrich in the vicinity of the oxide nodules. The oxidation progressed through the outward diffusion of cations and the inward diffusion of oxygen. This inward diffusion formed internal alumina islands, beneath the oxide scale.

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Yamanaka, Syuki, Ken-ichi Ikeda, and Seiji Miura. "Effect of Multi-Elements Substitution on the Mechanical Properties of Intermetallic Compound." MRS Advances 4, no. 25-26 (2019): 1497–502. http://dx.doi.org/10.1557/adv.2019.119.

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ABSTRACTIt is well known that various elements substitute for a certain sub-lattice of intermetallic compounds. There have been various experimental investigations of the effects of substituted elements on mechanical properties, however, there are few reports describing the effects of multi-element substitution. In the present study, L12-type compounds A3B (Ni3Al and Co3(Al,W)) were selected as model compounds because their substitution behavior is well known. It was reported that various elements such as Ni, Co, Cu, Pd and Pt occupy the A-site, whereas Al, Si, Ga, Ge, Ti, V, Nb, Ta, Mo, and W occupy the B-site. These elements are expected to introduce local lattice distortion, which may affect the motion of dislocations over a wide range of temperatures. Several alloys composed of five or more elements including Ni, Co, Al, Mo, and W, were prepared using an Ar-arc melting machine and heat-treated. Several alloys were found to include an (Ni, Co)3(Al, Mo, W, …)-L12 compound as a constituent phase. The nano-hardness of these L12 phases was higher than that of the high-strength Co3(Al,W)-L12 compound, confirming that multi-element substitution is an effective way to improve the mechanical properties of an intermetallic compound without decreasing the phase stability.

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Singh, Mahander Pratap, Emmanuel Femi Olu, Prafull Pandey, and Kamanio Chattopadhyay. "Thermophysical and magnetic properties of Co-Ni-Mo-Al-Ta class of tungsten free Co-based superalloys." Journal of Alloys and Compounds 879 (October 2021): 160379. http://dx.doi.org/10.1016/j.jallcom.2021.160379.

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Sanin, Vitaliy V., Yury Yu Kaplansky, Maksym I. Aheiev, Evgeny A. Levashov, Mikhail I. Petrzhik, Marina Ya Bychkova, Andrey V. Samokhin, Andrey A. Fadeev, and Vladimir N. Sanin. "Structure and Properties of Heat-Resistant Alloys NiAl–Cr–Co–X (X = La, Mo, Zr, Ta, Re) and Fabrication of Powders for Additive Manufacturing." Materials 14, no. 12 (June 8, 2021): 3144. http://dx.doi.org/10.3390/ma14123144.

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The NiAl–Cr–Co–X alloys were produced by centrifugal self-propagating high-temperature synthesis (SHS) casting. The effects of dopants X = La, Mo, Zr, Ta, and Re on combustion, as well as the phase composition, structure, and properties of the resulting cast alloys, have been studied. The greatest improvement in overall properties was achieved when the alloys were co-doped with 15% Mo and 1.5% Re. By forming a ductile matrix, molybdenum enhanced strength characteristics up to the values σucs = 1604 ± 80 MPa, σys = 1520 ± 80 MPa, and εpd = 0.79%, while annealing at T = 1250 ℃ and t = 180 min improved strength characteristics to the following level: σucs = 1800 ± 80 MPa, σys = 1670 ± 80 MPa, and εpd = 1.58%. Rhenium modified the structure of the alloy and further improved its properties. The mechanical properties of the NiAl, ZrNi5, Ni0.92Ta0.08, (Al,Ta)Ni3, and Al(Re,Ni)3 phases were determined by nanoindentation. The three-level hierarchical structure of the NiAl–Cr–Co+15%Mo alloy was identified. The optimal plasma treatment regime was identified, and narrow-fraction powders (fraction 8–27 µm) characterized by 95% degree of spheroidization and the content of nanosized fraction <5% were obtained.

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Rogachev, S. A., A. S. Rogachev, and M. I. Alymov. "Estimation of the critical vitrification rate of pure metals using molecular dynamics simulation." Доклады Академии наук 486, no. 2 (May 27, 2019): 168–72. http://dx.doi.org/10.31857/s0869-56524862168-172.

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A molecular dynamics simulation method was applied for estimation of critical cooling rates (vc) that required for amorphization of pure metals: Mg, Al, Ti, Fe, Co, Ni, Cu, Zr, Mo, Pd, Ag, Ta, W, Pt, Au, and Pb. The range of values vc was found to be from 7.9 × 1011 K/s for Al to 3.8 × 1013 K/s for Zr. The atomic structure obtained at different cooling rates is described. A dependence of the specific volume on temperature was investigated both during the amorphization and crystallization processes. The modelling shows, which metals have the highest temperature range of long-term stability of the amorphous phase (Fe, Mo, Ta, W). Estimates were given for the maximum radius of a melt drop that can be cooled at a rate of vc. The obtained simulation results were compared with available experimental data.

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Zhang, Yu, Qing Wang, Hong-Gang Dong, Chuang Dong, Hong-Yu Zhang, and Xiao-Feng Sun. "High-Temperature Structural Stabilities of Ni-Based Single-Crystal Superalloys Ni–Co–Cr–Mo–W–Al–Ti–Ta with Varying Co Contents." Acta Metallurgica Sinica (English Letters) 31, no. 2 (November 17, 2017): 127–33. http://dx.doi.org/10.1007/s40195-017-0678-0.

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Prut, V. V. "High pressure ruby scale." Izvestiya vysshikh uchebnykh zavedenii. Fizika, no. 7 (2022): 99–105. http://dx.doi.org/10.17223/00213411/65/7/99.

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A new calibration of the ruby scale is proposed, based on the Hugoniot equations and static isotherms at high pressures of a number of substances: Al, Co, Ni, Cu, Zn, Mo, Ag, Ta, W, Pt, Au. New functional dependencies have been identified P (λ). Errors arising because of errors in experimental shock and static data and the use of various functional dependences of equations of state are analyzed. The new scale is compared with all 14 published calibrations.

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Prüβner, K., K. B. Alexander, B. A. Pint, P. F. Tortorelli, and I. G. Wright. "Interfacial Segregation in Oxide Scales on Nicrai-Based Alloys." Microscopy and Microanalysis 3, S2 (August 1997): 785–86. http://dx.doi.org/10.1017/s1431927600010813.

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Previous studies addressing the segregation of reactive elements in protective oxide scales and their beneficial effect on scale adhesion have primarily concentrated on primary alumina-formers (e.g. β-NiAl + FeCrAl).In our study the oxidation behaviour of three NiCrAl alloys, which form complex scales was studied in air at 1423 K and at 1473 K, both in isothermal (100 h) and in cyclic oxidation (100 x lh). The composition (in at.-%) of these alloys is the following: General Electric alloy René N5 (64.9 Ni, 7.8 Cr, 13.9 Al, 0.1 Fe, 2.1 Ta, 0.05 Hf, 1.6 W, 1.0 Re, 0.15 Si, 7.3 Co, 0.9 Mo, 0.003 Y, 0.003 Zr, 4 ppm S, 0.25 C), Ni-7Cr-6.5Al+Y (80.1 Ni, 7.2 Cr, 12.5 Al, 0.01 Fe, 0.14 Si, 0.012 Y, 18 ppm S, 0.05 C) and Ni-10Cr-10Al+Y (71.2 Ni, 9.9 Cr, 18.8 Al, 0.01 Fe, 0.02 Si, 0.041 Y, 16 ppm S, 0.04 C).

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Dissertations / Theses on the topic "Co-Ni-Al- Mo-Ta"

OSTROWSKA, MARLENA. "Thermodynamic modelling and experimental validation of High Entropy Alloys containing Al, Co, Cr, Fe, Mo, Ni, Ta and W for high-temperature applications." Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1046937.

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The aim of the current project is to contribute to the design of novel High Entropy Alloys (HEAs) which meet targeted industrial needs, for instance the request for new high-temperature alloys. HEAs attracted a lot of attention due to their promising high temperature mechanical performance. Taking into account a very wide range of alloys that fall into this group of materials, using only experimental investigations would be insufficient in finding new compositions with attractive properties. The objective is achieved by thermodynamic modelling of the Al-Co-Cr-Fe-Mo-Ni-Ta-W system, through the CALPHAD method, in order to predict the best candidate elements and compositions which can give the required structure. The reliable and self-consistent database is obtained by assessing several important ternary systems and by adopting published assessments, if they were compatible with the models selected in this work. The reliability of the database is verified with experimental measurements performed during this work regarding the reference system Al-Co-Cr-Fe-Ni, as well as the critically selected published experimental data regarding several other multicomponent systems containing Mo and W. The synergy between modelling and experimental validation produce a highly reliable thermodynamic database which allows to screen and quickly identify high performance compositions, with a significant reduction in time and costs with respect to traditional trial and error experiments.

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Royer, Agnès. "Evolutions thermique et mécanique de la microstructure de superalliages monocristallins étudiées par diffusion centrale et diffraction (neutrons, rayons [gamma])." Grenoble 1, 1993. http://www.theses.fr/1993GRE10097.

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Les experiences de diffraction et de diffusion des rayonnements gamma et neutron nous ont permis d'etudier la microstructure du superalliage monocristallin am1 ainsi que son evolution en fonction de la temperature. Ces experiences ont pour la plupart ete realisees in situ en temperature et nos resultats qui sont relatifs a un grand nombre de precipites, ne sont pas sensibles aux heterogeneites locales de composition chimique. Nous avons analyse la morphologie des precipites gamma prime a l'aide d'experiences de diffusion aux petits angles des neutrons, au cours des phenomenes de precipitation et de coalescence des precipites gamma prime. La remise en solution de ces precipites a ete etudiee par diffraction neutron jusqu'a complete dissolution. Afin de mieux comprendre les mecanismes qui regissent l'evolution de la morphologie des precipites, nous avons etudie en temperature differents parametres microstructuraux. Par diffraction gamma, nous avons mis en evidence une distorsion tetragonale au sein du materiau et le desaccord parametrique entre les deux phases a pu etre mesure par diffraction neutrons a grands angles de bragg. La synthese des resultats obtenus au cours de ces differentes experiences, nous a permis d'etablir un modele qui prevoit l'evolution des parametres de maille des phases gamma et gamma prime en fonction de la temperature lors de recuits thermiques et sous contrainte

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Pandey, Prafull. "On the development of low mass density gamma strengthened Co-based superalloys." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4634.

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The work herein aims at developing new class of low mass density gamma-strengthened Co-based superalloys with good solvus temperature through systematic addition of Cr into the Co-Ni-Al- Mo-Ta based superalloy. The present thesis is divided into six chapters. The first chapter introduces various superalloys (Ni, Co and Fe-based) for high temperature applications. The timeline of different generations of Ni-based superalloys along with development in melting and casting techniques have been discussed in this chapter. All the gamma strengthened Co-based superalloys that are developed till date, and the effect of various alloying additions on the gamma stability in these alloys have also been summarized. Finally, the aims and objectives of the present thesis are defined. In the second chapter, the experimental methods are outlined. The experimental results and discussion are presented in the three subsequent chapters.

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Books on the topic "Co-Ni-Al- Mo-Ta"

A, Barrett Charles, and United States. National Aeronautics and Space Administration., eds. The effect of Cr, Co, Al, Mo, and Ta on a series of cast Ni-base superalloys on the stability of an aluminide coating during cyclic oxidation in Mach 0.3 burner rig. [Washington, D.C.]: National Aeronautics and Space Administration, 1986.

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