Microstructural evolution of FeCoNiCrMn high-entropy alloy subjected to laser shock peening: Molecular dynamics simulation study
Molecular dynamics (MD) and Monte Carlo (MC) simulations are used to study the microstructural evolution of FeCoNiCrMn high-entropy alloys (HEA) after laser shock peening (LSP). The shock wave structure, microstructure, and dislocation evolution of single-crystal HEA after LSP are investigated at di...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
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| Series: | Next Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949822825000413 |
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| Summary: | Molecular dynamics (MD) and Monte Carlo (MC) simulations are used to study the microstructural evolution of FeCoNiCrMn high-entropy alloys (HEA) after laser shock peening (LSP). The shock wave structure, microstructure, and dislocation evolution of single-crystal HEA after LSP are investigated at different shock velocities and shock directions. The elastic-plastic wave segregation of single-crystal HEA is observed at [110] crystal-direction shock. The cold fusion occurs in [110] and [111] crystal directions. After [001] grain direction shock, mainly the Hexagonal close-packed(HCP) phase is produced. The [110] and [111] grain directions mostly produce disordered structures aftershock. Lower-density dislocations are produced in the short-range ordered (SRO) model. A more complex microstructural evolution exists in nanocrystalline HEA due to the strong anisotropy of single-crystal HEA. A large number of stacking faults (SFs), twins, Hirth dislocation locks, and Lomer-Cottrell lock (LC) structures are generated. At the same time, nanocrystalline HEA produces a large number of dislocation entanglements near grain boundaries, leading to the precipitation of a large number of subgrains. |
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| ISSN: | 2949-8228 |