Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume 185, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.commatsci.2020.109988
Keywords
Vaporizing foil actuator welding; Immiscible materials; Interface; Joining strength; Molecular dynamics simulation
Categories
Funding
- US Department of Energy, Office of Vehicle Technology
- Oak Ridge National Laboratory (ORNL)
- U.S. Department of Energy [DE-AC05 00OR22725]
- DOE Vehicle Technologies Office under the Automotive Lightweight Materials Program
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It was recently demonstrated that the vaporizing foil actuator welding (VFAW) method can directly join immiscible magnesium and steel alloys without coating or a third chemical element based intermetallic compound layer. The VFAW Mg/steel joint exhibits a mixed interface layer of up to 200 mu m thickness consisting of Mg matrix and Fe particles. Multi-scale process simulations have suggested the formation of the interlayer is from the high-velocity frictional shearing between the Mg/steel substrates during the oblique impact in the VFAW process. This paper investigates the formation of Mg-Fe interlayer under VFAW condition with different shearing velocities using molecular dynamics (MD) models, and studies the bonding strength under different scenarios. The results elucidate the critical role of shearing velocity and surface roughness in achieving desirable Mg/Fe joint.
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