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  • Atefi, S., et al. (författare)
  • A study on microstructure development and mechanical properties of pure copper subjected to severe plastic deformation by the ECAP-Conform process
  • 2022
  • Ingår i: Journal of Materials Research and Technology. - : Elsevier. - 2238-7854 .- 2214-0697. ; 21, s. 1614-1629
  • Tidskriftsartikel (refereegranskat)abstract
    • Commercially pure copper rod was successfully subjected to severe plastic deformation by applying the continuous equal channel angular pressing (ECAP-Conform) method at room temperature. Microstructural characterizations of copper rod samples at various stages of plastic deformation were carried out by optical microscopy and electron backscatter diffraction methods. X-ray diffractometry and Kernal average misorientation were used for dislocation density estimations. Microstructural evaluations revealed grain size change of 30 mm for the initial annealed copper rod to less than 5 mm and even 100 nm for severely deformed samples. Mechanical behaviors of samples after different deformation stages were characterized using tensile and hardness tests. The ultimate tensile strength of the severely deformed copper rod was increased threefold by ECAP-Conform while elongation halved in comparison to the initial annealed copper. Low-temperature annealing of severely plastic deformed samples led to bi-modal grain size distribution and lowering of strength accompanied by the increase of elongation. Tensile properties of severely deformed and then annealed copper samples showed around a 40% increase in both ultimate tensile strength and elongation in comparison to the initial annealed copper rod.
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  • Hamnerius, Yngve, 1950, et al. (författare)
  • Distribution of ELF magnetic fields in Swedish dwellings
  • 2011
  • Ingår i: 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011, Istanbul, 13-20 August 2011. - 9781424451173
  • Konferensbidrag (refereegranskat)abstract
    • The purpose of this study is to assess the distribution of magnetic fields in the frequency range 10 Hz - 2000 Hz in randomly selected Swedish dwellings. The fields were measured in up to 3 rooms in each residence. In the master bedroom a 24 h logging of the fields was performed. The results show that 89 % of the measured houses have average magnetic fields below 0.2 μT with mean value of 0.11 μT and median value 0.05 μT. The comparison of magnetic fields in urban and rural area show that the lowest fields were found in rural areas with 97% of the residences have average magnetic fields below 0.2 μT with median value 0.04 μT. Comparing villas and apartments show that the median magnetic fields value for apartments is 0.07 μT compared to 0.04 μT for villas. The dominating frequency of the magnetic field was 50 Hz. The total harmonic distortion (THD) of the magnetic field was measured; the median value of THD was 10.3 %.
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