Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures
The complex thermal cycles during the solidification process in metal additive manufacturing (AM) lead to the formation of high-density dislocation networks, organizing into submicron-scale cellular structures. These ultrafine structures are recognized as crucial for enhancing the mechanical propert...
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MDPI AG
2025-04-01
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| author | Md Mahabubur Rohoman Caizhi Zhou |
| author_facet | Md Mahabubur Rohoman Caizhi Zhou |
| author_sort | Md Mahabubur Rohoman |
| collection | DOAJ |
| description | The complex thermal cycles during the solidification process in metal additive manufacturing (AM) lead to the formation of high-density dislocation networks, organizing into submicron-scale cellular structures. These ultrafine structures are recognized as crucial for enhancing the mechanical properties of AM metals. In this study, we investigate the evolution of dislocation density within these cellular structures under plastic deformation and its impact on mechanical response using dislocation density-based crystal plasticity finite element (CPFE) modeling. The model incorporates the evolution of both statistically stored dislocation (SSD) and geometrically necessary dislocation (GND). Our simulations reveal that the yield and flow stresses of dislocation cell structures exceed predictions based on the rule of mixtures (ROM). Additionally, the SSD density increases at a higher rate than the GND density. Factors such as the volume fraction of the cell wall, cell diameter, and initial dislocation density difference between the cell wall and interior significantly influence GND accumulation across different regions of the cellular dislocation structures. |
| format | Article |
| id | doaj-art-79df834b0a494c078e1d8725ecb5646e |
| institution | DOAJ |
| issn | 2075-4701 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj-art-79df834b0a494c078e1d8725ecb5646e2025-08-20T03:13:58ZengMDPI AGMetals2075-47012025-04-0115441910.3390/met15040419Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation StructuresMd Mahabubur Rohoman0Caizhi Zhou1Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USADepartment of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USAThe complex thermal cycles during the solidification process in metal additive manufacturing (AM) lead to the formation of high-density dislocation networks, organizing into submicron-scale cellular structures. These ultrafine structures are recognized as crucial for enhancing the mechanical properties of AM metals. In this study, we investigate the evolution of dislocation density within these cellular structures under plastic deformation and its impact on mechanical response using dislocation density-based crystal plasticity finite element (CPFE) modeling. The model incorporates the evolution of both statistically stored dislocation (SSD) and geometrically necessary dislocation (GND). Our simulations reveal that the yield and flow stresses of dislocation cell structures exceed predictions based on the rule of mixtures (ROM). Additionally, the SSD density increases at a higher rate than the GND density. Factors such as the volume fraction of the cell wall, cell diameter, and initial dislocation density difference between the cell wall and interior significantly influence GND accumulation across different regions of the cellular dislocation structures.https://www.mdpi.com/2075-4701/15/4/419crystal plasticitymicrostructureadditive manufacturingdislocation celldislocation densityfinite element method |
| spellingShingle | Md Mahabubur Rohoman Caizhi Zhou Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures Metals crystal plasticity microstructure additive manufacturing dislocation cell dislocation density finite element method |
| title | Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures |
| title_full | Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures |
| title_fullStr | Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures |
| title_full_unstemmed | Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures |
| title_short | Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures |
| title_sort | crystal plasticity modeling of dislocation density evolution in cellular dislocation structures |
| topic | crystal plasticity microstructure additive manufacturing dislocation cell dislocation density finite element method |
| url | https://www.mdpi.com/2075-4701/15/4/419 |
| work_keys_str_mv | AT mdmahabuburrohoman crystalplasticitymodelingofdislocationdensityevolutionincellulardislocationstructures AT caizhizhou crystalplasticitymodelingofdislocationdensityevolutionincellulardislocationstructures |