1. Synthesis and characterization of hardened Cu-Fe-Ni-P alloyGoran Brovč, Goran Dražić, Blaž Karpe, Igor Đorđević, Gorazd Lojen, Borut Kosec, Milan Bizjak, 2015, izvirni znanstveni članek Opis: In the manufacturing industry of electrical contacts, the prohibition of the use of toxic metals (Cd, Be), and desire to avoid the alloying with precious metals (Ag) has created a need for new alloys with good electrical conductivity and high mechanical properties at elevated temperatures. As a potentially useful material for this purpose, we have analyzed the continuously cast Cu-Fe-Ni-P alloy in various heat treatment conditions. Sequence of phase transformations during heat treatment was followed by 4 point D.C. electrical resistivity measuring method, and analyzed by scanning (SEM) and transmission (TEM) electron microscopy. Measurements of Vickers hardness and electrical conductivity after various heat treatment procedures indicate on high potential of Cu-Fe-Ni-P alloys as a material for electrical contacts.
Ključne besede: copper alloys, precipitation hardening, electrical contacts, electrical conductivity
Objavljeno v DKUM: 03.07.2017; Ogledov: 1931; Prenosov: 86
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2. The influence of copper on the decarburization and recrystallization of Fe-Si-Al alloysDarja Steiner Petrovič, Monika Jenko, Valter Doleček, 2006, izvirni znanstveni članek Opis: The decarburization and recrystallization of Fe-Si-Al alloys containing copper was investigated. The decarburization annealing of non-oriented electrical steel sheets produced from Fe-Si-Al alloys depends on the chemical reactions between the gas mixture and the carbon at the steel's surface. The carbon diffusion, the temperature of decarburization annealing, the composition of the gas mixture and the chemical composition of the steel are the influencing parameters that determine the kinetics and the mechanism of decarburization. The decarburization of Fe-Si-Al alloy with the mass fraction of 0.24% and 0.43% of copper was compared with the decarburization of an Fe-Si-Al alloy with a very small amount of copper (0.01%). The decarburization annealing was performed in a H2-H2O gas mixture at 840 °C. The residual carbon content was determined by analytical chemical method. The alloys were also recrystallized in hydrogen at 980 °C. Microstructure of samples after decarburization and recrystallization annealing was investigated with optical microscopy.
Ključne besede: alloys, recrystallization, decraburization, non-oriented electrical sheet steels, copper, carbon
Objavljeno v DKUM: 10.07.2015; Ogledov: 935; Prenosov: 81
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3. UV N2 laser ablation of a Cu-Sn-Zn-Pb alloy: microstructure and topography studied by focused ion beamFranc Zupanič, Tonica Bončina, Davor Pipić, Višnja Henč-Bartolič, 2008, izvirni znanstveni članek Ključne besede: materials investigation, microstructure, topography, copper alloys, laser, focused ion beams, UV nitrogen laser pulses, Scanning Electron Microscopy, laser ablation
Objavljeno v DKUM: 01.06.2012; Ogledov: 1850; Prenosov: 134
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4. Genetic programming approach for the material flow curve determination of copper alloy - CuCrZrLeo Gusel, Miran Brezočnik, Rebeka Rudolf, Ivan Anžel, Z. Lazarević, Nebojša Romčević, 2010, izvirni znanstveni članek Opis: For the control of the forming process it is necessary to know as precisely as possible the flow curve of the formed material. The paper presents the determination of the equation for the flow curve of cooper alloy (CuCrZr) with artificial intelligence approach. The genetic programming method (GP) was used. It is an evolutionary optimization technique based on the Darwinist principles of the evolution of species and the survival of the fittest organisms. The main characteristic of GP is its non- deterministic way of computing. It is probably the most general approach out of evolutionary computation methods. The comparison between the experimental results, analytical solution and the solution obtained genetically clearly shows that the genetic programming method is a very promising approach.
Ključne besede: forming, flow curve, copper alloys, genetic programming
Objavljeno v DKUM: 01.06.2012; Ogledov: 1353; Prenosov: 27
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