A molecular dynamics simulation of structural transformations in nanocrystalline Fe95Ni05 samples with a single grain size and a gradient grained structure under shock loading is carried out. The shock loading condition is set by a constant-rate displacement of the non-deformable surface layer. It is found out that the generated shock wave is split into elastic and plastic components. An interaction of the plastic component with the grain boundaries leads to a generation of intrinsic stacking faults. The compressive stresses in the shock wave decrease as it propagates, which reduces the generation intensity of stacking faults and their density after stress relaxation. It is revealed that with a grain size increase, the density of the remaining stacking faults can significantly decrease, and the largest grains can completely restore the initial crystal structure after the shock wave propagation. By varying the grain structure, one can control the evolution of shock waves and the density of structural defects remaining in the material.
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Kryzhevich, D.S., Korchuganov, A.V., Grigoriev, A.S. et al. Plastic Deformation of Nanocrystalline Fe95Ni05 with Gradient Grained Structure under Shock Loading. Russ Phys J 67, 511–517 (2024). https://doi.org/10.1007/s11182-024-03151-y
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DOI: https://doi.org/10.1007/s11182-024-03151-y