Electron beam welding (EBW) is currently the most advanced jointed technology because of its superior welding precision and larger depth-width ratio than other conjunctive methods. The high vacuum environment of EBW is favorable for the welding of magnesium alloys to prevent the active metals from oxidation. In this study, a home-made 11mm-thick AZ91D extrusive plate was used. By operating and comparing the changeable welding parameters, the optimum condition has been determined as 113mA, 40kV, 73.3mm/s and focal position at bottom. 82% and 89% of the matrix material strength were obtained by stress and non-stress concentration weldments, respectively. Under other worse parameters, the reduction of the strength of EBW for AZ91D-F resulted from four factors, which were undercuts, heat affected zone (HAZ), hot cracking, and
cavities.
Ag nanowires have shown great application value in the field of flexible electronics due to their excellent optical and electrical properties, and the quality of its joints of Ag nanowires in the thin film network directly plays a key role in its performance. In order to further improve the joint quality of Ag nanowires under thermal excitation, the thermal welding process and atomic evolution behavior of Ag nanowires were investigated through a combination of in situ experimental and molecular dynamics simulations. The influence of processing time, temperature, and stress distribution due to spatial arrangement on nanojoints was systematically explored. What’s more, the failure mechanisms and their atomic interface behavior of the nanojoints were also investigated.
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