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Journal articles on the topic 'Cobalt-based alloy'

Author: Grafiati

Published: 28 June 2021

Last updated: 17 February 2022

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1

Margida, Anthony J., Keith D. Weiss, and J. David Carlson. "MAGNETORHEOLOGICAL MATERIALS BASED ON IRON ALLOY PARTICLES." International Journal of Modern Physics B 10, no. 23n24 (October 30, 1996): 3335–41. http://dx.doi.org/10.1142/s0217979296001781.

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A magnetorheological material containing iron alloy particles demonstrates magnetorheological strength dependent upon the elements of the alloy and relative concentration of the alloy elements. Selected iron/cobalt alloys demonstrate improved yield strength over traditional carbonyl iron based MR materials when the iron-cobalt alloy has an iron-cobalt ratio ranging from about 30:70 to 95:5. The iron-nickel alloys which have an iron-nickel ratio ranging from about 90:10 to 99:1 maintains superior strength over iron-nickel alloys outside that range.

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2

Zeng, Xi, Zhuo Li, Fengfei Xi, Shiming Ji, Lei Qiu, Meng Shi, Qianqian Zheng, and Wenbin Qiu. "Material Removal Characteristic of Laser Cladding Cobalt-Based Alloy in the Photochemical Process." Metals 9, no. 6 (June 5, 2019): 657. http://dx.doi.org/10.3390/met9060657.

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Cobalt-based alloy materials, widely used for laser cladding, are difficult to process. To address this problem, and based on the analysis of the physicochemical properties of cobalt and its compounds, a method for removing cobalt-based alloy materials under photocatalytic conditions was proposed under the effect of ultraviolet photocatalysis and chemical corrosion. In this study, a material removal model under photocatalytic conditions was established, and the reaction principle of cobalt-based alloys under ultraviolet photocatalysis and chemical corrosion conditions was described. We designed a corrosion solution configuration test and established a cobalt-based alloy processing test based on a pneumatic wheel test platform. The processing test proved that the combination of ultraviolet (UV) photocatalysis and Basic Yellow 40 + TiO2 chemical corrosion pretreatment can significantly increase the mechanical material removal rate of cobalt-based alloy materials and effectively reduce surface roughness. At the same time, processing efficiency can be increased over 40%. This showed that the new method is capable of performing well in the field of mold cobalt-based alloy coating processing in the future.

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3

Pigatto, Paolo D., and Gianpaolo Guzzi. "Cobalt-based dental alloy, allergy to cobalt, and palmoplantar pustulosis." Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology 113, no. 2 (February 2012): 153–54. http://dx.doi.org/10.1016/j.tripleo.2011.05.048.

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4

Yu, Hui Jun. "Development Status of Laser Clad Cobalt-Based Alloy Coatings." Advanced Materials Research 748 (August 2013): 192–95. http://dx.doi.org/10.4028/www.scientific.net/amr.748.192.

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Laser cladding, as an effective method of metal surface modification, is to fuse an alloy coating of enhanced mechanical and chemical properties on the surface of a substrate. Therefore, laser cladding has been attracting continuous and extensive research for years. In this paper, the research progress in laser clad cobalt-based alloys is summarized. The preparing processes, microstructures, properties and influence factors of laser clad cobalt-based alloys coatings and their ceramic particles strengthened composites coatings are analyzed systematically. And the existing problems, some solving measures, the development tendencies and industral uses are presented.

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5

Ageeva, E. V., A. Yu Altukhov, R. A. Latypov, and G. R. Latypova. "X-ray spectral microanalysis of hardened additive products made of electroerosion cobalt-chromium alloys." MATEC Web of Conferences 329 (2020): 02014. http://dx.doi.org/10.1051/matecconf/202032902014.

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This article presents the results of an X-ray spectral microanalysis of cobalt-chromium alloys based on particles of the of the tungsten nickel iron alloy dispersed by electric erosion, obtained in alcohol. It has been experimentally proved that a part of oxygen is present in the cobalt-chromium alloy of particles of the cobalt-chromium-molybdenum alloy dispersed by electric erosion. All other elements are distributed relatively evenly over the volume of particles. It is shown that Co, Cr and Mo are the main elements of the (CoCrMo) alloy dispersed by electric erosion.

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6

Song, Hong, Qin Ma, and Yin Wen. "Cobalt-based dental alloy, allergy to cobalt, and palmoplantar pustulosis—reply." Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology 113, no. 2 (February 2012): 154. http://dx.doi.org/10.1016/j.tripleo.2011.08.008.

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7

R. Rajkumar, R. Rajkumar, K. Antonyraj K. Antonyraj, M. Ezhil Inban M. Ezhil Inban, P. Rajesh P.Rajesh, N. Vignesan N. Vignesan, and P. Gowrishankar P. Gowrishankar. "Magnetoresistance in Electrodeposited Cobalt Based Alloys: Influence of Multinary Alloy Combination." Journal of Environmental Nanotechnology 8, no. 2 (2019): 10–14. http://dx.doi.org/10.13074/jent.2019.06.192361.

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8

Amkhadova, M. A., S. N. Garazha, D. Yu Rakhaeva, E. N. Grishilova, Z. S. S. Khubaev, S. S. Khachaturov, E. F. Nekrasova, and Z. R. Muzaeva. "Improving efficiency of orthopedic treatment of partial teeth loss in inflammatory pathology of periodont." Medical alphabet 2, no. 11 (November 23, 2019): 40–42. http://dx.doi.org/10.33667/2078-5631-2019-2-11(386)-40-42.

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The effectiveness of complex orthopedic treatment of partial loss of teeth in inflammatory periodontal disease is a very serious problem. Of particular importance is the choice of materials for removable dentures, as it can contribute to the adsorption of periodontal pathogens. This paper studied the tolerance of dental alloys (cobalt alloy ‘Gialloy PA Co/Cr’, gold-based ‘CASDEN-B’ cobalt alloy ‘Gialloy PA Co/Cr’ with zircon gold plated ‘Kamadan’) to parodontoceras microflora (Staphylococcus aureus, Escherichia coli, Streptococcus pyogenes, Pseudomonasa eroginosa, Candida albicans). It is established that all the studied samples of dental alloys are subject to colonization by periodontal microorganisms in the oral cavity, while the degree of colonization depends on the chemical composition of the alloys and the type of bacterial cultures. Cobalt-chromium alloy with gold-zirconium coating, which is recommended as a structural material in periodontal pathology, has the lowest tolerance indicators of dental structural alloys to periodontal microflora. Based on the analysis of clinical studies, we have established a high efficiency of the use of prostheses made of cobalt-chromium alloy with gold-zirconium coating in the treatment of chronic generalized periodontitis of moderate severity against the background of tooth loss in comparison with the traditional alloy.

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9

Pustovalov, Evgeny Vladislavovich, Evgeny B. Modin, and Aleksandr N. Fedorets. "Atomic Structure Design of Rapidly Quenched Amorphous Cobalt-Based Alloys." Solid State Phenomena 265 (September 2017): 569–74. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.569.

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The research presents the atomic structure investigation of amorphous rapidly quenched Co58Ni10Fe5Si11B16 at.% alloys. The alloys were quenched with linear velocity of cooper wheel surface from 22 to 38 m/s. We found a nonlinear dependence of local atomic ordering from linear velocity of cooling wheel. The average lateral density of ordered atomic clusters of 5 nm size changes from 4% to 8%. The amorphous alloy with metastable disordered structure with lower level of free energy is more stable against the external conditions. This approach can be used to determine the best technological parameters for preparing amorphous metallic alloy with metastable structure.

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10

Mahapatra, Rabindra, M. Ashraf Imam, C. S. Lei, and C. R. Feng. "Cobalt-Based Alloys for High Temperature Applications." Materials Science Forum 654-656 (June 2010): 550–53. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.550.

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The isothermal oxidation behavior and thermal stability of a cobalt base alloy was investigated up to a period of 312 hr in air from 1000 to 1200°C. A comparison of oxidation behavior of this alloy with a conventional nickel-base superalloy (Inconel 713C) has been conducted in detail. This experimental alloy oxidizes by forming layers of Al2O3, Cr2O3, TiO2, CoO and traces of SiO2 with WO2 oxides on the surface of the specimen in contact with air. Scanning electron microscopy (SEM) was used to study the microstructure, morphology and compositions of oxides formed after the exposure. Thermal stability of the alloy after extended periods of exposures to air at 1000, 1100 and 1200°C was studied using transmission electron microscopy (TEM).

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11

Shanabarger, Mickey R. "Hydrogen transport parameters for a cobalt based alloy." Journal of Alloys and Compounds 253-254 (May 1997): 381–85. http://dx.doi.org/10.1016/s0925-8388(96)03067-8.

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12

Dimic, Ivana, Ivana Cvijovic-Alagic, Ivana Kostic, Aleksandra Peric-Grujic, Marko Rakin, Slavisa Putic, and Branko Bugarski. "Metallic ion release from biocompatible cobalt-based alloy." Chemical Industry and Chemical Engineering Quarterly 20, no. 4 (2014): 571–77. http://dx.doi.org/10.2298/ciceq130813039d.

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Metallic biomaterials, which are mainly used for the damaged hard tissue replacements, are materials with high strength, excellent toughness and good wear resistance. The disadvantages of metals as implant materials are their susceptibility to corrosion, the elastic modulus mismatch between metals and human hard tissues, relatively high density and metallic ion release which can cause serious health problems. The aim of this study was to examine metallic ion release from Co-Cr-Mo alloy in artificial saliva. In that purpose, alloy samples were immersed into artificial saliva with different pH values (4.0, 5.5 and 7.5). After a certain immersion period (1, 3 and 6 weeks) the concentrations of released ions were determined using Inductively Coupled Plasma - Mass Spectrophotometer (ICP-MS). The research findings were used in order to define the dependence between the concentration of released metallic ions, artificial saliva pH values and immersion time. The determined released metallic ions concentrations were compared with literature data in order to describe and better understand the phenomenon of metallic ion release from the biocompatible cobalt-based alloy.

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13

Ramous, E., A. Zambon, M. Magrini, B. Badan, and M. Bianco. "Cobalt based alloy thick coatings by CDS process." Surface Engineering 13, no. 4 (January 1997): 310–14. http://dx.doi.org/10.1179/sur.1997.13.4.310.

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14

Fu, Guang Yan, Xin Zhao, Qun Liu, and Yong Su. "Hot Corrosion of Cobalt-Based Alloy with (Na, K)₂SO₄ Coating at 900 °C." Advanced Materials Research 194-196 (February 2011): 1305–8. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.1305.

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The hot corrosion behavior of pure Co, Co-10Cr and Co-10Cr-5Al alloys coated with (4～4.5) mg/cm2 (Na, K)2SO4 deposits has been studied at 900 °C in air by thermogravimetry and SEM/EDX analysis. The results show that hot corrosion rate of Co-10Cr alloy was obviously higher than that of Co-10Cr-5Al alloy and hot corrosion rate of pure Co was between those of the two cobalt-based alloys. Both alloys produced complex corrosion scales, containing an outermost layer of pure cobalt oxide and an inner layer where the oxides of both alloy components were simultaneously present on the Co-10Cr alloy, while a middle layer containing CoO and Cr2O3 and an inner layer of Al2O3 with a few aluminum sulfides appeared on the Co-10Cr-5Al alloy. The results were interpreted by taking into account the effect of active element and hot corrosion mechanism.

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15

Cherepova, Tetiana, Galyna Dmitrieva, Oleksandr Tisov, Oleksandr Dukhota, and Myroslav Kindrachuk. "Research on the Properties of Co-Tic and Ni-Tic Hip-Sintered Alloys." Acta Mechanica et Automatica 13, no. 1 (March 1, 2019): 57–67. http://dx.doi.org/10.2478/ama-2019-0009.

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Abstract Three types of sintered alloys were fabricated based on cobalt, nickel and high-temperature alloy ZhS32-VI matrix with titanium carbide strengthening phase. TiC content was in a range of 30–50 vol. %. The melting temperatures of alloys are higher than 1320°C, and they may undergo undamaged through all technological procedures together with turbine blades, including soldering and outgassing. DSC analyses indicates no additional thermal effects until melting, which confirms their structural stability. The examinations of microstructure revealed three types of constituents – TiC particles, matrix solid solution and blow outs – structural defects having negative effects on all the studied properties. It was found that heat resistance of nickel based sintered alloys at the temperature of 1100°C is superior as compared with the alloys based on cobalt and alloy ZhS32-VI. It has been established that wear resistance in conditions of fretting wear at temperatures of 20, 850, 950 and 1050°C of sintered alloy with ZhS32-VI matrix is mostly superior as compared with the other alloys. The properties of produced alloys allow to use them for manufacturing of components of friction couples operating in conditions of high temperature fretting wear, including protective pads of turbine blades top shrouds contact faces.

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16

Dadvand, Nazila, Mina Dadvand, and Georges Kipouros. "Reversed Pulse Plating of Silver-Cobalt for Connector Applications." International Symposium on Microelectronics 2018, no. 1 (October 1, 2018): 000403–8. http://dx.doi.org/10.4071/2380-4505-2018.1.000403.

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Abstract The manuscript describes the use of anti-galling silver-cobalt alloy as a novel metallic contact finish for connector applications. The purpose of this work was to develop a cost-effective and cyanide-free and self-lubricated silver-cobalt alloy deposited using reversed pulse electrodeposition process for silver-based contact finishes in electrical contacts applications. The manuscript describes a novel silver-cobalt alloy deposited through reversed pulse-electroplating process that provides exceptionally low friction coefficient (similar to hard gold) and outstanding wear resistance compared to standard silver and any commercially available electroplated silver alloys such as silver-tin, silver palladium, silver antimony, silver-bismuth, silver-tellurium, and silver-tungsten.

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17

Minciună, Mirabela Georgiana, Petrică Vizureanu, Dragoş Cristian Achiţei, Mohd Mustafa Al Bakri Abdullah, and Andrei Victor Sandu. "Structural Analysis of CoCrMoSi6 Alloy Used in Medical Applications." Key Engineering Materials 700 (July 2016): 86–92. http://dx.doi.org/10.4028/www.scientific.net/kem.700.86.

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Increase the life exploitation of implants has been the motor factor in the elaboration of the new biocompatible alloys based on cobalt. The paper aims the complete structural characterizations for CoCrMoSi6 alloy, based on modern investigation methods, like compositional analysis by EDX method, optical and electronic microscopy analysis, X-ray diffractrometric analysis, fracture analysis. The experiments aimed to establish all the structural aspects for CoCrMoSi6 alloy and his recommendation for using to manufacture the components for medical applications. The results obtained from the SEM microstructural analysis, for the original version allied with silicon in percentage of 6%, certify a dendritic structure specific to the cobalt base alloys. This paper established the structural aspects for a new variant of CoCrMoSi6 alloy and recommends their use successfully in the production of components for medical applications.

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18

Park, Seung Hwan C., Satoshi Hirano, Shinya Imano, Yutaka S. Sato, Hiroyuki Kokawa, Toshihiro Omori, and Kiyohito Ishida. "Friction-Stir Welding of High-Softening-Temperature Materials Using Cobalt-Based Alloy Tool." Materials Science Forum 706-709 (January 2012): 996–1001. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.996.

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The authors have developed a new friction-stir welding (FSW) tool that enables to weld high-softening-temperature materials (HSTMs), such as steels, titanium and zirconium alloys. The new tool is made of a Co-based heat-resistant alloy strengthened by precipitating intermetallics, Co3(Al,W), with a L12 structure at high temperatures. The Co-based alloy tool exhibits yield strengths higher than 500 MPa at 1000 deg C, so it might have a great potential as a tool material for FSW of HSTMs. In this study, the feasibility of using the Co-based alloy tool with various HSTMs was examined. Changes in the tool shape during FSW and the weld appearances produced with the Co-based alloy tool will be briefly shown.

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19

Yaedu, A. E., and A. S. C. M. D'Oliveira. "Cobalt based alloy PTA hardfacing on different substrate steels." Materials Science and Technology 21, no. 4 (April 2005): 459–66. http://dx.doi.org/10.1179/174328413x13789824293380.

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20

Zhenghe, Han, Wang Xinlin, and Ke Cheng. "Magnetic stability of water-quenched cobalt-based amorphous alloy." Materials Science and Engineering 99, no. 1-2 (March 1988): 119–22. http://dx.doi.org/10.1016/0025-5416(88)90305-9.

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21

Misra, R. D. K., and D. Akhtar. "Hydrogen embrittlement behaviour of a cobalt-based amorphous alloy." Materials Letters 3, no. 12 (September 1985): 500–502. http://dx.doi.org/10.1016/0167-577x(85)90099-0.

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22

Bedolla-Gil, Y., and M. A. L. Hernandez-Rodriguez. "Tribological Behavior of a Heat-Treated Cobalt-Based Alloy." Journal of Materials Engineering and Performance 22, no. 2 (June 6, 2012): 541–47. http://dx.doi.org/10.1007/s11665-012-0261-9.

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23

Garcia-Falcon, Carmen Marina, Tomas Gil-Lopez, Amparo Verdu-Vazquez, and Julia Claudia Mirza-Rosca. "Analysis and Comparison of the Corrosive Behavior of Nickel-Based and Cobalt-Based Dental Alloys." Materials 14, no. 17 (August 30, 2021): 4949. http://dx.doi.org/10.3390/ma14174949.

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Nickel-based and cobalt-based metal alloys are frequently used in dentistry. The introduction of various elements in the alloy changes its characteristics, and a thorough study of each alloy should be completed to determine its appropriate corrosion resistance and biocompatibility in contact with physiological fluids. There are scarce investigations on these widely used dental alloys in Ringer solution, and findings in this research bring new experimental data and information. The present study evaluated and compared the corrosion behavior of six NiCr- and two CoCr-based dental materials in Ringer solution, using the following techniques: potentiostatic polarization curves (chronoamperometry), microstructural analysis, and EIS (electrochemical impedance spectroscopy). The results obtained in this investigation showed that in the NiCr-based specimens Ni4, Ni5, and Ni6 the stability of the passive layer was destroyed after polarization and a development and growth of stable pits was found in the microstructural analysis after electrochemical treatment. In terms of susceptibility to corrosion, two different groups of specimens were derived from this investigation. A first group which included the two CoCr (Co1 and Co2) and three of the six NiCr alloys studied (Ni1, Ni2, and Ni3). A second group with the other NiCr alloys investigated Ni4, Ni5, and Ni6.

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24

Saprikin, A. A., Yurii P. Sharkeev, Natalya A. Saprykina, Margarita A. Khimich, and Egor A. Ibragimov. "Formation of Structural-Phase State in a Cobalt-Chromium-Molybdenum Alloy by Selective Laser Melting." Solid State Phenomena 313 (January 2021): 50–58. http://dx.doi.org/10.4028/www.scientific.net/ssp.313.50.

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Heat resistant cobalt-based alloys have found a specific niche in the present-day mechanical engineering due to their unique properties. To begin with, cobalt-based alloys are used as corrosion, heat and wear resistant materials intended for aggressive environments and operation at extreme temperatures, e.g. blades, nozzles, swirlers, rings and other elements of turbines and internal combustion engines. Traditional molding methods applied in the mechanical engineering fail to provide necessary operational and technological characteristics of aforementioned machine parts. Owing to selective laser melting it is possible to reduce a production time and manufacturing costs for machine elements with a complex physical configuration and generate an alloy with an extraordinary structure, which is not found in traditionally combined compounds. A structure of cobalt exists in two crystal modifications: a hexagonal close-packed epsilon phase, a low-temperature phase and a face-centered cubic lattice gamma phase, a high-temperature phase. The alloy hardness is directly related to an amount of a low-temperature phase. The laser melting shortens a laser beam impact time on a powder composition due to a higher power and laser travelling speed. A high value of heat conductivity seems to be the reason for rapid solidification and cooling, which, in their turn, increase a percent of an alpha-martensite phase in an alloy and improve the hardness and wear resistance of machine parts. The reported paper summarizes studies aimed at the development of a stable phase structure three-component alloy (Сo-66 mass % Cr-6 mass % Mo) based on the cobalt-chromium-molybdenum system and mixed up via selective laser melting.

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25

Saprikin, A. A., Yurii P. Sharkeev, Natalya A. Saprykina, Margarita A. Khimich, and Egor A. Ibragimov. "Formation of Structural-Phase State in a Cobalt-Chromium-Molybdenum Alloy by Selective Laser Melting." Solid State Phenomena 313 (January 2021): 50–58. http://dx.doi.org/10.4028/www.scientific.net/ssp.313.50.

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Heat resistant cobalt-based alloys have found a specific niche in the present-day mechanical engineering due to their unique properties. To begin with, cobalt-based alloys are used as corrosion, heat and wear resistant materials intended for aggressive environments and operation at extreme temperatures, e.g. blades, nozzles, swirlers, rings and other elements of turbines and internal combustion engines. Traditional molding methods applied in the mechanical engineering fail to provide necessary operational and technological characteristics of aforementioned machine parts. Owing to selective laser melting it is possible to reduce a production time and manufacturing costs for machine elements with a complex physical configuration and generate an alloy with an extraordinary structure, which is not found in traditionally combined compounds. A structure of cobalt exists in two crystal modifications: a hexagonal close-packed epsilon phase, a low-temperature phase and a face-centered cubic lattice gamma phase, a high-temperature phase. The alloy hardness is directly related to an amount of a low-temperature phase. The laser melting shortens a laser beam impact time on a powder composition due to a higher power and laser travelling speed. A high value of heat conductivity seems to be the reason for rapid solidification and cooling, which, in their turn, increase a percent of an alpha-martensite phase in an alloy and improve the hardness and wear resistance of machine parts. The reported paper summarizes studies aimed at the development of a stable phase structure three-component alloy (Сo-66 mass % Cr-6 mass % Mo) based on the cobalt-chromium-molybdenum system and mixed up via selective laser melting.

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26

Berthod, Patrice, and Lionel Aranda. "Determination of Diffusion Coefficients Using Thermogravimetric Measurements during High Temperature Oxidation." Defect and Diffusion Forum 323-325 (April 2012): 289–94. http://dx.doi.org/10.4028/www.scientific.net/ddf.323-325.289.

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Thermogravimetry measurements associated to concentration profiles allow determining a diffusion coefficient at high temperature of the most oxidable one among the metallic elements belonging to the chemical composition of an alloy. In this work the employed method is described and applied to chromia-forming alloys essentially based on nickel but also to selected cobalt-based and iron-based alloys. More precisely DCrvalues were estimated for chromium diffusing through the carbide-free zones developed during high temperature oxidation. The effects of the base element, of the chromium carbides density and of the dendritic orientations on the chromium diffusion were evidenced.

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27

Wei, Fu-Gao, Keum-Yeon Hwang, and Yoshinao Mishima. "Deformation of Co3AlC0.5 and a Co3AlC0.5-strengthened cobalt-based alloy." Intermetallics 9, no. 8 (August 2001): 671–79. http://dx.doi.org/10.1016/s0966-9795(01)00045-0.

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28

Wang, Shuai, Chunguang Yang, Ling Ren, Minggang Shen, and Ke Yang. "Study on antibacterial performance of Cu-bearing cobalt-based alloy." Materials Letters 129 (August 2014): 88–90. http://dx.doi.org/10.1016/j.matlet.2014.05.020.

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29

Bafandeh, Mohammad Reza, Raziyeh Gharahkhani, and Mohammad Hossein Fathi. "Characterization of fabricated cobalt-based alloy/nano bioactive glass composites." Materials Science and Engineering: C 69 (December 2016): 692–99. http://dx.doi.org/10.1016/j.msec.2016.07.053.

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30

Fradin, V., R. I. Grynszpan, F. Alves, A. Houzali, and J. C. Perron. "Structural Relaxation in an Amorphous Rapidly Quenched Cobalt-Based Alloy." Le Journal de Physique IV 05, no. C1 (January 1995): C1–151—C1–156. http://dx.doi.org/10.1051/jp4:1995117.

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31

Hao, Chen, and Pan Chun-xu. "Microstructure and fractural morphology of cobalt-based alloy laser cladding." Journal of Wuhan University of Technology-Mater. Sci. Ed. 18, no. 3 (September 2003): 30–32. http://dx.doi.org/10.1007/bf02838452.

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32

Yu, Juan, Yongbin Zeng, and Di Zhu. "Wire electropolishing of microgroove structures on a cobalt-based alloy." International Journal of Advanced Manufacturing Technology 96, no. 9-12 (March 9, 2018): 3619–31. http://dx.doi.org/10.1007/s00170-017-1534-0.

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33

Weigert, M., St U. Schittny, and B. L. Gehman. "Improved magnetic behaviour of cobalt-based-alloy sputter-target material." Materials Science and Engineering: A 139 (July 1991): 359–63. http://dx.doi.org/10.1016/0921-5093(91)90642-z.

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34

Li, Mingxi, Shihong Zhang, Huisheng Li, Yizhu He, Jae-Hong Yoon, and Tong-Yul Cho. "Effect of nano-CeO2 on cobalt-based alloy laser coatings." Journal of Materials Processing Technology 202, no. 1-3 (June 2008): 107–11. http://dx.doi.org/10.1016/j.jmatprotec.2007.08.050.

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35

Li, Niannian, Fengshi Yin, and Liu Feng. "Microstructure of a V-Containing Cobalt Based Alloy Prepared by Mechanical Alloying and Hot Pressed Sintering." Metals 9, no. 4 (April 22, 2019): 464. http://dx.doi.org/10.3390/met9040464.

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In this paper, a bulk V-containing cobalt-based alloy with high chromium and tungsten contents was prepared by mechanical alloying and hot pressed sintering using Co, Cr, W, Ni, V and C pure element powders. XRD, SEM, TEM and Vickers hardness tests were employed to characterize the microstructure and mechanical properties of the mechanical alloyed powders and hot pressed bulk cobalt-based alloy. The results show that all elements can be mixed uniformly and that the Co, Cr, and Ni elements were made into an amorphous state after 10 h ball milling in a high energy ball miller. The microstructure of the prepared bulk alloy was composed of a γ-Co matrix with a large number of nano-twins and fine M23C6 and M12C carbide particles well-distributed in the alloy. The V element was mainly distributed in M23C6-type carbide and no V-rich MC-type carbide was found in the microstructure. The prepared alloy had a high hardness of 960 ± 9.2 HV and good a fracture toughness KIc of about 10.5 ± 0.46 MPa·m1/2. The microstructure formation and strengthening mechanisms of the prepared cobalt-based alloy are discussed.

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36

Srivastava, A. P., Dinesh Srivastava, K. G. Suresh, and G. K. Dey. "Nanocrystallization of Cobalt Based Metallic Glass." Advanced Materials Research 67 (April 2009): 25–32. http://dx.doi.org/10.4028/www.scientific.net/amr.67.25.

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Effect of copper addition in a Metallic glass 2714A on the nanocrystallization characteristics have been examined in this study. Amorphous ribbon of the alloy composition Co64.5 Fe3.5 Si16.5 B13.5 Ni1Cu1 were prepared by melt spinning technique. Nanocrystallization kinetics was studied using differential scanning calorimeter technique. The kinetic parameters such as activation energy and Avrami exponent were determined using two different non-isothermal analysis methods. The kinetic behavior of individual crystallization event has been rationalized on the basis of these results. The role of addition of copper on the crystallization behavior has been understood by comparing with Metallic glass 2714A. The isothermally annealed nanocrystallized microstructures were characterized by X-ray diffraction.

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Jing, Qi-Feng, and Ye-Fa Tan. "Tribological properties of cobalt-based alloy coating with different cobalt contents by electro-spark deposition." Rare Metals 32, no. 1 (February 2013): 40–46. http://dx.doi.org/10.1007/s12598-013-0007-3.

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Абросимова, Г. Е., А. С. Аронин, and Н. А. Волков. "Формирование нанокристаллов в аморфной фазе многокомпонентных систем." Физика твердого тела 61, no. 7 (2019): 1352. http://dx.doi.org/10.21883/ftt.2019.07.47850.415.

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AbstractThe effect of the concentration of alloying components on the crystallization of amorphous (Fe_73Si_13B_9)_1 – _ x _– _ y Nb_ x Cu_ y and (Co_70Si_12B_9)_1 – _ x _– _ y Fe_ x Nb_ y alloys has been studied by X-ray diffraction and transmission electron microscopy in a wide composition region. The formation of the bcc structures in both the alloy groups is shown to be substantially dependent on the alloying component concentrations. The bcc phase is found to form in the cobalt-based alloys in the concentration region, where it was not observed before. In the cobalt-based alloys, the bcc phase appears at a niobium concentration higher than 1 at % and the average bcc nanocrystal size varies from 40 nm (at 1 at % Nb) to 14 nm (at 5 at % Nb). In the Fe-based alloys, nanocrystals with the bcc lattice form at the copper concentrations of 0.45–1 at %, and the average nanocrystal size is dependent on the alloy composition and varies in the range 16–24 nm. The causes of the concentration dependence of the formation of nanostructures in these alloys are discussed.

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Wang, Jian-Hong, Jie Ren, Wei Liu, Xiao-Yu Wu, Ming-Xiang Gao, and Pei-Kang Bai. "Effect of Selective Laser Melting Process Parameters on Microstructure and Properties of Co-Cr Alloy." Materials 11, no. 9 (August 27, 2018): 1546. http://dx.doi.org/10.3390/ma11091546.

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Due to the rapid melting and solidification mechanisms involved in selective laser melting (SLM), CoCrMo alloys fabricated by SLM differ from the cast form of the same alloy. In this study, the relationship between process parameters and the morphology and macromechanical properties of cobalt-chromium alloy micro-melting pools is discussed. By measuring the width and depth of the molten pool, a theoretical model of the molten pool is established, and the relationship between the laser power, the scanning speed, the scanning line spacing, and the morphology of the molten pool is determined. At the same time, this study discusses the relationship between laser energy and molding rate. Based on the above research, the optimal process for the laser melting of cobalt-chromium alloy in the selected area is obtained. These results will contribute to the development of biomedical CoCr alloys manufactured by SLM.

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Jovanović, Milan. "Nickel, cobalt and titanium-based alloys – from aircraft vehicles to medical applications - REVIEW." Metallurgical and Materials Engineering 22, no. 3 (October 6, 2016): 205–20. http://dx.doi.org/10.30544/235.

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Since the introduction of nickel, cobalt and titanium-based alloys in the early 1950s, these materials in a relatively short time became backbone materials for the aerospace, energy, chemical industry and even medicine. The combination of excellent mechanical properties, corrosion resistance and bio-compatibility renders these alloys the best material choice for many critical applications. This review describes the results realized through the research in the Department of Materials Science in “Vinča” Institute. The emphasize was given to the relation between the microstructure and mechanical properties of conventionally cast nickel and cobalt-based superalloys, as well as directionally solidified and single crystal castings of nickel-based superalloys. The special attention was paid to the development of vacuum melting and casting technology for processing surgical implants made of a titanium-based alloy.

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Yu, H., R. Ahmed, and H. de Villiers Lovelock. "A Comparison of the Tribo-Mechanical Properties of a Wear Resistant Cobalt-Based Alloy Produced by Different Manufacturing Processes." Journal of Tribology 129, no. 3 (January 9, 2007): 586–94. http://dx.doi.org/10.1115/1.2736450.

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This paper aims to compare the tribo-mechanical properties and structure–property relationships of a wear resistant cobalt-based alloy produced via two different manufacturing routes, namely sand casting and powder consolidation by hot isostatic pressing (HIPing). The alloy had a nominal wt % composition of Co–33Cr–17.5W–2.5C, which is similar to the composition of commercially available Stellite 20 alloy. The high tungsten and carbon contents provide resistance to severe abrasive and sliding wear. However, the coarse carbide structure of the cast alloy also gives rise to brittleness. Hence this research was conducted to comprehend if the carbide refinement and corresponding changes in the microstructure, caused by changing the processing route to HIPing, could provide additional merits in the tribo-mechanical performance of this alloy. The HIPed alloy possessed a much finer microstructure than the cast alloy. Both alloys had similar hardness, but the impact resistance of the HIPed alloy was an order of magnitude higher than the cast counterpart. Despite similar abrasive and sliding wear resistance of both alloys, their main wear mechanisms were different due to their different carbide morphologies. Brittle fracture of the carbides and ploughing of the matrix were the main wear mechanisms for the cast alloy, whereas ploughing and carbide pullout were the dominant wear mechanisms for the HIPed alloy. The HIPed alloy showed significant improvement in contact fatigue performance, indicating its superior impact and fatigue resistance without compromising the hardness and sliding∕abrasive wear resistance, which makes it suitable for relatively higher stress applications.

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Fukushima, Sadao, and Takayoshi Kasugai. "Spot Welding of Iron-based and Cobalt-based Amorphous Alloy Foils. (Report 2)." QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 9, no. 3 (1991): 457–64. http://dx.doi.org/10.2207/qjjws.9.457.

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Berthod, Patrice. "Looking for New Polycrystalline MC-Reinforced Cobalt-Based Superalloys Candidate to Applications at 1200°C." Advances in Materials Science and Engineering 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/4145369.

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For applications for which temperatures higher than 1150°C can be encountered the currently best superalloys, the γ/γ′ single crystals, cannot be used under stress because of the disappearance of their reinforcing γ′ precipitates at such temperatures which are higher than their solvus. Cobalt-based alloys strengthened by refractory and highly stable carbides may represent an alternative solution. In this work the interest was focused on MC carbides of several types. Alloys were elaborated with atomically equivalent quantities in M element (among Ti, Ta, Nb, Hf, or Zr) and in C. Script-like eutectic TiC, TaC, NbC, HfC, and ZrC carbides were successfully obtained in the interdendritic spaces. Unfortunately, only one type, HfC, demonstrated high morphological stability during about 50 hours at 1200°C. The concerned alloy, of the Co-25Cr-0.5C-7.4Hf type (in wt.%), was further characterized in flexural creep resistance and air-oxidation resistance at the same temperature. The creep behaviour was very good, notably by comparison with a more classical Co-25Cr-0.5C-7.5Ta alloy, proving that the interest of HfC is higher than the TaC one. In contrast the oxidation by air was faster and its behaviour not really chromia-forming. Significant improvements of this chemical resistance are expected before taking benefit from the mechanical superiority of this alloy.

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Spektor, V. S., S. M. Sarychev, and A. A. Orlov. "The Effect of Surface Conditions on Corrosion Resistance of a Cobalt-Chromium Alloy." Key Engineering Materials 887 (May 2021): 358–63. http://dx.doi.org/10.4028/www.scientific.net/kem.887.358.

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The article discusses the effect of the surface conditions on the corrosion resistance of alloys based on cobalt, titanium and stainless steel, which are currently used for the manufacture of components for implantable medical devices. It is shown that an increase in surface roughness has practically no effect on the corrosion resistance of alloys based on cobalt and titanium.

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Farmakovsky, B. V., N. A. Sokolova, and T. I. Bobkova. "Composite cobalt-based alloy for functional coatings deposition using heterophase transfer." Voprosy Materialovedeniya, no. 2(98) (August 11, 2019): 57–63. http://dx.doi.org/10.22349/1994-6716-2019-98-2-57-63.

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The paper describes an alloy with a content of 20–26% Co, 17.4–21.1% Cr, 2.6–4.9% Si, 3–5% Re, 4–6% Zr, 0.2–0,6% Ce, 0.1–0.5% La, 0.3–0.7%Y, 2–4% Al. The cobalt-based alloy is applied as protective coating on components of precision engineering with adhesion 42–45 MPa, microhardness 3.6 GPa, corrosion resistance class 1, within the range of operating temperatures from –60 to 550°С.

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Permyakova, I. E. "INVESTIGATION OF CORROSION RESISTANCE OF AMORPHOUS COBALT-BASED ALLOY AFTER ANNEALING." Tambov University Reports. Series: Natural and Technical Sciences 21, no. 3 (2016): 1226–29. http://dx.doi.org/10.20310/1810-0198-2016-21-3-1226-1229.

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Sheu, Hung-Hua, Chen-En Lu, Hung-Bin Lee, Nen-Wen Pu, Po-Fan Wu, Sheau-Hwa Hsieh, and Ming-Der Ger. "Electrodeposition of black chromium–cobalt alloy based on trivalent sulfate electrolyte." Journal of the Taiwan Institute of Chemical Engineers 59 (February 2016): 496–505. http://dx.doi.org/10.1016/j.jtice.2015.08.002.

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SAKAKIBARA, Mitsuru, and Toshifumi SHINNOH. "DEVELOPMENT OF MAGNETICALLY SHIELDED ROOM COMPRISED OF COBALT-BASED AMORPHOUS ALLOY." AIJ Journal of Technology and Design 25, no. 61 (October 20, 2019): 1155–60. http://dx.doi.org/10.3130/aijt.25.1155.

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Yuan, Xiaotao, Xin Wang, Muhammad Sohail Riaz, Chenlong Dong, Zhe Zhang, and Fuqiang Huang. "Efficient catalysts for oxygen evolution derived from cobalt-based alloy nanochains." Catalysis Science & Technology 8, no. 9 (2018): 2427–33. http://dx.doi.org/10.1039/c8cy00226f.

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Li, H. S., M. X. Li, Y. Z. He, J. H. Yoon, and K. Shin. "Microstructure of cobalt based alloy coatings produced by laser deposit welding." Science and Technology of Welding and Joining 11, no. 5 (September 2006): 567–71. http://dx.doi.org/10.1179/174329306x101427.

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