Grain Boundary Motion in Magnetic-Pulse-Welded Al-Fe Bimetal Systems: An Atomistic Simulation Study
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Date
2025-08-26
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Abstract
Magnetic pulse welding (MPW) is an ef ective solid-state welding method of joining
dissimilar metals such as Al/Steel, Al/Ti, Al/Cu et al. In order to understand fully such
important phenomena as atomic dif usion, grain boundary motion, interfacial
non- equilibrium-phase nucleation and growth in MPW, a detailed microscopic description of
the MPW interface is necessary. This study is an extension of our previous work. In the
present work, we extend the simulation investigation to polycrystal aluminium and iron
systems using Molecular dynamic (MD) method. The polycrystal systems allow for the
study of interfacial segregation. Our simulations present structural information on the GBs
in nanocrystalline microstructures. Flat GBs can move when subjected dynamic load
resulting from the high-velocity impact. Plots of the ratio of GB atoms versus time show a
distinctly dif erent GB migration behaviors between loading and unloading conditions. By
contrast with our earlier simulations, it was observed that crystal order and stability are
highly preserved in the loading stage. The transformation of grain boundary structural
change is due to stress-driven GB migration and temperature dependent as well. Grain
rotation mechanism was identified. This work could provide atomistic insights into the
grain refinement during MPW process.
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Keywords
Magnetic pulse welding, Grain boundaries, Molecular dynamics
Subjects based on RSWK
Elektromagnetisches Pulsschweißen, Bimetall, Aluminium, Eisen, Korngrenzenwanderung, Molekulardynamik