caa a22 4500 463228332 CHVBK 20180405153234.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s10853-007-1604-z doi (NATIONALLICENCE)springer-10.1007/s10853-007-1604-z Microstructural and mechanical characterization of electron beam welded Al-alloy 7020 [Elektronische Daten] [G. Çam, M. Koçak] The electron beam (EB) welding process is used to weld any metal that can be arc welded with equal or superior weld quality. EB welding is carried out in a high-purity vacuum environment, which results in freedom from impurities such as oxides and nitrides. Thus, pore-free joints can readily be achieved in metallic materials, such as Al-alloys and Ti-alloys. However, autogenous EB welding of some aluminium alloys leads to a significant strength reduction (undermatching) in the fusion zone due to the loss of strengthening phases. For such Al-alloys, the local microstructure-property relationships should be established to satisfy the service requirement of a welded component with strength undermatching. Autogenous EB welding was performed on 5mm thick aluminium alloy 7020 plate. Microstructural characterization of the weld metals was made by optical and scanning electron microscopy. Extensive microhardness measurements were conducted in the weld regions of the joints which exhibited a hardness loss in the fusion zone due to the loss of strengthening phases. Tensile properties of the joints were determined by testing flat transverse tensile specimens at room temperature without machining the weld profiles. Furthermore, elastic-plastic fracture toughness tests (CTOD) were carried out on the base material and welded joints at room temperature. Springer Science+Business Media, LLC, 2007 Çam G. Faculty of Engineering and Architecture, Mechanical Engineering Department, Mustafa Kemal University, 31034, Antakya, Turkey aut Koçak M. GKSS Research Center, Institute of Materials Research, Max-Planck-Str., 21502, Geesthacht, Germany aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/17(2007-09-01), 7154-7161 0022-2461 42:17<7154 2007 42 10853 https://doi.org/10.1007/s10853-007-1604-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1604-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Çam G. Faculty of Engineering and Architecture, Mechanical Engineering Department, Mustafa Kemal University, 31034, Antakya, Turkey aut NATIONALLICENCE 700 1- Koçak M. GKSS Research Center, Institute of Materials Research, Max-Planck-Str., 21502, Geesthacht, Germany aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/17(2007-09-01), 7154-7161 0022-2461 42:17<7154 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer