Theoretical Study of comparative between the speed of penetration and cutting using a laser beam

This research is devoted to study the effect of a laser beampower TEA-CO2 , Nd- YAG laser, and thermal properties of the materialswhen it is constant once and varying another once with the time on thepenetration and cutting speeds. It is concluded that the processes ofpenetration and cutting by using laser Nd-YAG is the best comparativewith using of laser TEA-CO2, penetration speeds when (P = P0, C = C0,and ρ = ρ0) by using laser Nd-YAG greater than penetration speeds byusing of laser TEA-CO2 by 15.5 approximately while penetration speedswhen (P = P(t), C = C0, and ρ = ρ0) by using laser Nd-YAG greater thanpenetration speeds by using of laser TEA-CO2 by 8.519 approximately. Inaddition, the temperature of the evaporation of material plays animportant role in the processes of penetration and cutting and whenevertemperature of the evaporation of material less the cutting andpenetration speeds are greater. (MATLAB 8) program was implementedfor all simulation processes are related

Structure and mechanical properties of metallic nanoglasses

Metallic nanoglasses are a new class of amorphous materials with interesting magnetic and mechanical properties. They are characterized by interfacial regions with enhanced free volume compared to the core of the nanoparticles. Till now, nanoglasses are primarily synthesized by using thermal evaporation in inert gas condensation (IGC). However, due to the different vapour pressure of constituent elements and reproducibility issues in thermal evaporation, it is difficult/impossible to synthesize different glassy compositions. In this work, by using magnetron sputtering in IGC, Cu50Zr50, Cu60Zr40 and Pd84Si16 nanoglasses are produced with completely amorphous nature and good reproducibility. By varying several parameters, the yield of the sputtering process in IGC is optimized to make sufficient amount of material to obtain a nanoglass pellet. The influence of several processing parameters like inert gas pressure, sputtering power, the type of material etc., on the yield of the process are studied in the current work. The primary aim of the current work is to study the properties of the nanoglasses and compare them with conventional metallic glasses produced by melt-spinning and thus comment on the relation between the structure and properties of nanoglasses. Structural characterization of the metallic nanoglasses showed that the samples are amorphous in nature. Elemental segregation in the samples was studied by atom probe tomography and significant segregation was found in Cu-Zr alloys while very little chemical inhomogeneity was observed in Pd-Si nanoglasses. Crystallization temperature was higher in Cu-Zr nanoglasses than that in melt-spun ribbons while Pd-Si nanoglasses showed lower glass transition and crystallization temperature compared to melt-spun ribbons. Mechanical properties of the nanoglasses and melt-spun ribbons were tested by indentation and micropillar compression tests. Hardness and elastic modulus were found to be higher in Cu-Zr and lower in Pd-Si nanoglasses compared to their corresponding melt-spun ribbons. Deformation mode was also found to be different in Cu-Zr and Pd-Si nanoglasses. While Cu-Zr nanoglasses deformed homogenously without the formation of shear bands during indentation, Pd-Si alloys showed shear bands around the indents. Similar results were also observed in micropillar tests of Pd-Si and Cu-Zr nanoglasses. Cu-Zr nanoglasses showed less catastrophic deformation compared to the melt-spun ribbons while shear banding was observed in both Pd-Si nanoglasses and melt-spun ribbons. With the help of molecular dynamic simulations, the effect of topological structure at the interfacial regions was studied in Pd-Si metallic nanoglasses. Simulation results conveyed that the fraction of major Si polyhedra i.e. Si[0,3,6,0] played an important role in determining the shear band formation and consequently the ductility of glassy Pd-Si alloys. With the increase in the fraction of Si[0,3,6,0] in the interfacial regions of Pd-Si nanoglasses, the mode of deformation changed from homogenous to heterogeneous one. The importance of chemical inhomogeneity on the thermal and mechanical properties of nanoglasses was described in detail based on a segregation model. Finally, Pd80Si20 thin film nanoglasses synthesized by conventional magnetron sputtering were also studied in the current work. No elemental segregation was observed in thin films. Annealing the nanoglassy thin films did not lead to any change in the globular nanostructure even after crystallization. The mode of deformation was practically the same as that in the rapidly quenched ribbon. The reasons for similar behaviour of the thin films and melt-spun ribbons are discussed

Remanufacturing and Advanced Machining Processes for New Materials and Components

"Remanufacturing and Advanced Machining Processes for Materials and Components presents current and emerging techniques for machining of new materials and restoration of components, as well as surface engineering methods aimed at prolonging the life of industrial systems. It examines contemporary machining processes for new materials, methods of protection and restoration of components, and smart machining processes. • Details a variety of advanced machining processes, new materials joining techniques, and methods to increase machining accuracy • Presents innovative methods for protection and restoration of components primarily from the perspective of remanufacturing and protective surface engineering • Discusses smart machining processes, including computer-integrated manufacturing and rapid prototyping, and smart materials • Provides a comprehensive summary of state-of-the-art in every section and a description of manufacturing methods • Describes the applications in recovery and enhancing purposes and identifies contemporary trends in industrial practice, emphasizing resource savings and performance prolongation for components and engineering systems The book is aimed at a range of readers, including graduate-level students, researchers, and engineers in mechanical, materials, and manufacturing engineering, especially those focused on resource savings, renovation, and failure prevention of components in engineering systems.

Remanufacturing and Advanced Machining Processes for New Materials and Components

"Remanufacturing and Advanced Machining Processes for Materials and Components presents current and emerging techniques for machining of new materials and restoration of components, as well as surface engineering methods aimed at prolonging the life of industrial systems. It examines contemporary machining processes for new materials, methods of protection and restoration of components, and smart machining processes. • Details a variety of advanced machining processes, new materials joining techniques, and methods to increase machining accuracy • Presents innovative methods for protection and restoration of components primarily from the perspective of remanufacturing and protective surface engineering • Discusses smart machining processes, including computer-integrated manufacturing and rapid prototyping, and smart materials • Provides a comprehensive summary of state-of-the-art in every section and a description of manufacturing methods • Describes the applications in recovery and enhancing purposes and identifies contemporary trends in industrial practice, emphasizing resource savings and performance prolongation for components and engineering systems The book is aimed at a range of readers, including graduate-level students, researchers, and engineers in mechanical, materials, and manufacturing engineering, especially those focused on resource savings, renovation, and failure prevention of components in engineering systems.

Remanufacturing and Advanced Machining Processes for New Materials and Components

Remanufacturing and Advanced Machining Processes for Materials and Components presents current and emerging techniques for machining of new materials and restoration of components, as well as surface engineering methods aimed at prolonging the life of industrial systems. It examines contemporary machining processes for new materials, methods of protection and restoration of components, and smart machining processes. • Details a variety of advanced machining processes, new materials joining techniques, and methods to increase machining accuracy • Presents innovative methods for protection and restoration of components primarily from the perspective of remanufacturing and protective surface engineering • Discusses smart machining processes, including computer-integrated manufacturing and rapid prototyping, and smart materials • Provides a comprehensive summary of state-of-the-art in every section and a description of manufacturing methods • Describes the applications in recovery and enhancing purposes and identifies contemporary trends in industrial practice, emphasizing resource savings and performance prolongation for components and engineering systems The book is aimed at a range of readers, including graduate-level students, researchers, and engineers in mechanical, materials, and manufacturing engineering, especially those focused on resource savings, renovation, and failure prevention of components in engineering systems

Remanufacturing and Advanced Machining Processes for New Materials and Components

Remanufacturing and Advanced Machining Processes for Materials and Components presents current and emerging techniques for machining of new materials and restoration of components, as well as surface engineering methods aimed at prolonging the life of industrial systems. It examines contemporary machining processes for new materials, methods of protection and restoration of components, and smart machining processes. • Details a variety of advanced machining processes, new materials joining techniques, and methods to increase machining accuracy • Presents innovative methods for protection and restoration of components primarily from the perspective of remanufacturing and protective surface engineering • Discusses smart machining processes, including computer-integrated manufacturing and rapid prototyping, and smart materials • Provides a comprehensive summary of state-of-the-art in every section and a description of manufacturing methods • Describes the applications in recovery and enhancing purposes and identifies contemporary trends in industrial practice, emphasizing resource savings and performance prolongation for components and engineering systems The book is aimed at a range of readers, including graduate-level students, researchers, and engineers in mechanical, materials, and manufacturing engineering, especially those focused on resource savings, renovation, and failure prevention of components in engineering systems

Effect of Laser Power on the Quality of Drilled Micro Hole Using Cu50Zr50 Amorphous Alloys Foils

The rapid growth of the micro-electro-mechanical systems (MEMS) is being driven by the rapid development of the micro manufacturing processes. Laser beam machining is one of the micro manufacturing processes which can shape almost all ranges of engineering materials. In this study, the effect of laser power on the quality of drilled micro holes using Cu50Zr50 amorphous alloys foils is experimentally investigated. It indicates that both entrance and exit circularities diameters increase with laser power. The circularities of the holes at the entry and the exit are in the range of 0.893 to 0.997. The taper of drilled holes increases quickly to a stable value with the increase of laser power from 60 to 110 W, then decreases quickly when the laser power becomes larger than 170 W. The micro holes with a diameter of 400 to 1200 μm are manufactured successfully by laser drilling processes. The formation mechanism of the quality of the laser drilled hole is analyzed based on the laser beam and the properties of amorphous alloys foils

Microscopy Conference 2021 (MC 2021) - Proceedings

Das Dokument enthält die Kurzfassungen der Beiträge aller Teilnehmer an der Mikroskopiekonferenz "MC 2021"