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2,064 results on '"Eckert, Jürgen"'

58. Ti40Zr10Cu36Pd14 bulk metallic glass as oral implant material

Author

Rezvan, Amir, Sharifikolouei, Elham, Soprunyuk, Viktor, Schranz, Wilfried, Todt, Juraj, Lassnig, Alice, Gammer, Christoph, August Sifferlinger, Nikolaus, Asci, Atacan, Okulov, Ilya, Schlögl, Sandra, Keckes, Jozef, Najmi, Ziba, Cochis, Andrea, Calogero Scalia, Alessandro, Rimondini, Lia, Sarac, Baran, and Eckert, Jürgen

Published
2023
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80. The Microstructure and Properties of Ni60/60% WC Wear-Resistant Coatings Prepared by Laser-Directed Energy Deposition.

Author

Yang, Husen, Li, Wen, Liu, Yichun, Li, Fengxian, Yi, Jianhong, and Eckert, Jürgen

Subjects
COMPOSITE coating, FRETTING corrosion, SURFACE roughness, WEAR resistance, SUBSTRATES (Materials science)
Abstract

Ni60/60% WC composite coatings with a good surface roughness and high mechanical properties were successfully prepared on 316L stainless steel substrate by laser-directed energy deposition (LDED) technology. The effects of laser power on the microstructural evolution and mechanical properties of the Ni60/60% WC composite coating were investigated. The relationships between the chemical composition, the microstructure, the hardness, and the friction wear resistance of the composite coatings were characterized and investigated. The results show that the laser power had a significant effect on the energy input, which determined the melting extent of the Ni60 phases around the WC particles and the bonding strength between the reinforcements and the matrix, as well as the bonding strength between the substrate and the coatings. With an increase in the laser power from 800 W to 1400 W, the average hardness of the coating surface increased due to the increased densification of the deposited coatings and then decreased due to grain coarsening under a high energy input. The average coefficient of friction of the coatings decreased gradually to 0.383 at 1000 W, showing a minimum wear of 0.00013 mm2 at 1200 W. The main wear mechanisms on the coated surfaces were adhesive wear and abrasive wear. Moreover, the coatings deposited at 1200 W exhibited better forming quality and wear resistance. This work suggests that the processing parameters during LDED can be optimized to prepare Ni60/60% WC wear-resistant coatings with excellent mechanical properties. [ABSTRACT FROM AUTHOR]

Published
2024
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81. Effect of Laser Power on Microstructure and Properties of WC-12Co Composite Coatings Deposited by Laser-Based Directed Energy Deposition.

Author

Li, Wen, Yang, Husen, Liu, Yichun, Li, Fengxian, Yi, Jianhong, and Eckert, Jürgen

Subjects
HIGH power lasers, COMPOSITE coating, SUBSTRATES (Materials science), WEAR resistance, SURFACE coatings, LASER deposition, METAL powders
Abstract

During the laser-based directed energy deposition (DED-LB) processing, a WC-12Co composite coating with high hardness and strong wear resistance was successfully prepared on a 316L stainless steel substrate by adopting a high-precision coaxial powder feeding system using a spherical WC-12Co composite powder, which showed a large number of dendritic carbides and herringbone planar crystals on the substrate-binding interface. The influences of laser power on microstructural and mechanical properties (e.g., hardness, friction resistance) of WC-12Co composite surfaces were investigated. The results show that laser power has a significant effect on determining the degree of Co phase melting around the WC particles and the adhesion strength between the matrix and the coating. Lower laser power does not meet the melting requirements of WC particles, thus weakening the molding quality of the composite coating. At high laser power, it is possible to dissolve the WC particles and melt the metal powder between the particles, thus improving the material properties. The laser power increased from 700 W to 1000 W and the average hardness of the coating surface gradually increased from 1166.33 HV to 1395.70 HV, which is about 4–5 times higher than the average hardness of the substrate (about 281.76 HV). In addition, the coatings deposited at 1000 W showed better wear resistance. This work shows that the processing parameters during laser-directed energy deposition can be optimized to prepare WC-12Co composite coatings with excellent mechanical properties. [ABSTRACT FROM AUTHOR]

Published
2024
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83. Local nanoscale strain mapping of a metallic glass during in situ testing

Author

Gammer, Christoph, Ophus, Colin, Pekin, Thomas C, Eckert, Jürgen, and Minor, Andrew M

Subjects
Physical Sciences, Engineering, Technology, Applied Physics
Abstract

The local elastic strains during tensile deformation in a CuZrAlAg metallic glass are obtained by fitting an elliptic shape function to the characteristic amorphous ring in electron diffraction patterns. Scanning nanobeam electron diffraction enables strain mapping with a resolution of a few nanometers. Here, a fast direct electron detector is used to acquire the diffraction patterns at a sufficient speed to map the local transient strain during continuous tensile loading in situ in the transmission electron microscope. The elastic strain in tensile direction was found to increase during loading. After catastrophic fracture, a residual elastic strain that relaxes over time was observed.

Published
2018

86. Anticorrosion and Antimicrobial Tannic Acid-Functionalized Ti-Metallic Glass Ribbons for Dental Abutment

Author

Yüce, Eray, primary, Sharifikolouei, Elham, additional, Micusik, Matej, additional, Ferraris, Sara, additional, Rashidi, Reza, additional, Najmi, Ziba, additional, Gümrükçü, Selin, additional, Scalia, Alessandro, additional, Cochis, Andrea, additional, Rimondini, Lia, additional, Spriano, Silvia, additional, Omastova, Maria, additional, Sarac, Abdulkadir Sezai, additional, Eckert, Jürgen, additional, and Sarac, Baran, additional

Published
2024
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100. Molecular Dynamics Study of the Nanoindentation Behavior of Cu₆₄Zr₃₆/Cu Amorphous/Crystalline Nanolaminate Composites

Author

Wu, Wen-Ping, Şopu, Daniel, Eckert, Jürgen, Wu, Wen-Ping, Şopu, Daniel, and Eckert, Jürgen

Abstract

Amorphous/crystalline nanolaminate composites have aroused extensive research interest because of their high strength and good plasticity. In this paper, the nanoindentation behavior of Cu₆₄Zr₃₆/Cu amorphous/crystalline nanolaminates (ACNLs) is investigated by molecular dynamics (MD) simulation while giving special attention to the plastic processes occurring at the interface. The load–displacement curves of ACNLs reveal small fluctuations associated with shear transformation zone (STZ) activation in the amorphous layer, whereas larger fluctuations associated with dislocations emission occur in the crystalline layer. During loading, local STZ activation occurs and the number of STZs increases as the indentation depth in the amorphous layer increases. These STZs are mostly located around the indenter, which correlates to the high stresses concentrated around the indenter. When the indenter penetrates the crystalline layer, dislocations emit from the interface of amorphous/crystalline, and their number increases with increasing indentation depth. During unloading, the overall number of STZs and dislocations decreases, while other new STZs and dislocations become activated. These results are discussed in terms of stress distribution, residual stresses, indentation rate and indenter radius.

Published
2024

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