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This paper reports an anomalous wave formation at an Al/Cu bimetallic interface produced by magnetic pulse welding. The mechanism of the anomalous wave formation is investigated using both metallurgical characterization and the interface kinematics. It reveals that the anomalous wave is formed with the combination of the intermediate zone and a thin interdiffusion zone, wherein the intermediate zone is caused by the local melting due to the high shear instability, and the interdiffusion zone is formed below the melting point of aluminum combined with ultrahigh heating and cooling. A multiphysics simulation predicts that the jetting kinematics and non-uniform distribution of shear strains during high-speed collision enable the formation of the anomalous wave. The numerical and experimental results comprehensively lead to understanding of the mechanism and the characteristics of the anomalous wave produced during an impact welding.

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This page is a summary of: An anomalous wave formation at the Al/Cu interface during magnetic pulse welding, Applied Physics Letters, April 2020, American Institute of Physics,
DOI: 10.1063/5.0005299.
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