Effect of Mg Loss on Mechanical Properties of Electron-Beam-Welded Al5083
In this study, the effect of decreased Mg concentration on the mechanical properties of an autogenously electron-beam-welded 150-mm-thick Al5083 plate was studied. First, full penetration welding was conducted via irradiation with a single electron beam (EB), with a full penetration depth of ca. 150 mm and a weld-metal width below 10 mm, yielding a high aspect ratio. The focused current (mA) and welding velocity (mm/mm) were 494 and 300, respectively. The weld part was then irradiated again under the same conditions. During both EB irradiation processes, the Mg concentration of the weld part was evaluated using electron probe micro-analysis (EPMA) and inductively coupled plasma optical emission spectroscopy (ICP-OES). After the two irradiation procedures, the decrease in Mg concentration indicated by the ICP-OES was 0.56 wt.% of 4.59 wt.%, the initial Mg concentration. Microstructural evaluation and testing of mechanical properties such as the tensile and impact strength were performed in order to investigate their response to the Mg loss. The impact energy of the weld metal was found to have increased despite the decrease in Mg concentration, whereas the results of the tensile tests for the base and weld metals were very similar. The mechanical properties in the heat-affected zone (HAZ) and fusion zone were slightly lower than the weld metal. As the results of this study indicate, the electron beam welding (EBW) process did not cause degradation of the mechanical properties, despite the decreased Mg content in the Al5083; thus, this approach can be considered a type of solid solution strengthening for alloys.
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Document Type: Research Article
Publication date: April 1, 2016
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