The Characterization and Analysis of A Pseudo Single-grained Copper Impact Weld Interface in Regards to the Effects of Severe Plastic Deformation
Keywords:Vaporizing Foil Actuator Welding
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Materials Science and Engineering Honors Theses; 2018
Characteristic features of impact welding were explored in regards to the vaporizing foil actuator welding of pseudo single-grained copper sheets. 1/8 hard oxygen free high conductivity copper sheets at various thicknesses were annealed so that abnormal grain growth would occur and simulate a single-grained microstructure. The 0.063" thick sheet was welded to itself using VFAW with an input energy of 10kJ and a standoff distance of 3mm. Optical microscopy was performed on the weld interface at the center of the foil blast, and it showed a clean interface that easily held several characteristic features of impact welding. Electron backscatter diffraction gave a clearer picture of the weld interface, which included deformation twinning, dynamic recrystallization, possible shear banding or nano-twinning, localized melting, and localized grain growth due to heating. Thus, the use of pseudo single-grained materials in impact welding was shown to clearly reveal interface features in impact welding, which will aid in future simulation, experiments, and industry adaptation of impact welding.
Denman Undergraduate Research Forum, Second in Category Engineering: Materials
Academic Major: Materials Science and Engineering
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