Quantifying internal strains, stresses, and dislocation density in additively manufactured AlSi10Mg during loading-unloading-reloading deformation
The plastic deformation of the AlSi10Mg alloy manufactured via laser powder bed fusion (LPBF) is incompatible at the microscale, which causes residual strains/stresses and dislocation pile-ups at the Al/Si interfaces and grain boundaries. Hence, it is of fundamental significance to clarify these mic...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-01-01
|
| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127520308753 |
| _version_ | 1818965377984495616 |
|---|---|
| author | X.X. Zhang H. Andrä S. Harjo W. Gong T. Kawasaki A. Lutz M. Lahres |
| author_facet | X.X. Zhang H. Andrä S. Harjo W. Gong T. Kawasaki A. Lutz M. Lahres |
| author_sort | X.X. Zhang |
| collection | DOAJ |
| description | The plastic deformation of the AlSi10Mg alloy manufactured via laser powder bed fusion (LPBF) is incompatible at the microscale, which causes residual strains/stresses and dislocation pile-ups at the Al/Si interfaces and grain boundaries. Hence, it is of fundamental significance to clarify these microscopic properties during plastic deformation. Here, in-situ neutron diffraction is employed to explore the residual strains, stresses, and dislocation density in the LPBF AlSi10Mg during loading-unloading-reloading deformation. It is found that the maximum residual stresses of the Al and Si phases in the loading direction reach up to about −115 (compressive) and 832 (tensile) MPa, respectively. A notable dislocation annihilation phenomenon is observed in the Al matrix: the dislocation density decreases significantly during unloading stages, and the amplitude of this reduction increases after experiencing a larger plastic deformation. At the macroscale, this dislocation annihilation phenomenon is associated with the reverse strain after unloading. At the microscale, the annihilation phenomenon is driven by the compressive residual stress in the Al matrix. Meanwhile, the annihilation of screw dislocations during unloading stages contributes to the reduction in total dislocation density. |
| first_indexed | 2024-12-20T13:16:03Z |
| format | Article |
| id | doaj.art-8fbd7ed96a604e91b430be59beccdbf9 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-20T13:16:03Z |
| publishDate | 2021-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-8fbd7ed96a604e91b430be59beccdbf92022-12-21T19:39:33ZengElsevierMaterials & Design0264-12752021-01-01198109339Quantifying internal strains, stresses, and dislocation density in additively manufactured AlSi10Mg during loading-unloading-reloading deformationX.X. Zhang0H. Andrä1S. Harjo2W. Gong3T. Kawasaki4A. Lutz5M. Lahres6Fraunhofer Institute for Industrial Mathematics ITWM, Fraunhofer-Platz 1, 67663 Kaiserslautern, Germany; Corresponding author.Fraunhofer Institute for Industrial Mathematics ITWM, Fraunhofer-Platz 1, 67663 Kaiserslautern, GermanyJ-PARC Center, Japan Atomic Energy Agency, 2-4 Shirane Shirakata, Tokai, Naka, Ibaraki 319-1195, JapanElements Strategy Initiative for Structural Materials, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, JapanJ-PARC Center, Japan Atomic Energy Agency, 2-4 Shirane Shirakata, Tokai, Naka, Ibaraki 319-1195, JapanMercedes Benz AG, Research and Development Department, Leibnizstraße 2, 71032 Böblingen, GermanyMercedes Benz AG, Research and Development Department, Leibnizstraße 2, 71032 Böblingen, GermanyThe plastic deformation of the AlSi10Mg alloy manufactured via laser powder bed fusion (LPBF) is incompatible at the microscale, which causes residual strains/stresses and dislocation pile-ups at the Al/Si interfaces and grain boundaries. Hence, it is of fundamental significance to clarify these microscopic properties during plastic deformation. Here, in-situ neutron diffraction is employed to explore the residual strains, stresses, and dislocation density in the LPBF AlSi10Mg during loading-unloading-reloading deformation. It is found that the maximum residual stresses of the Al and Si phases in the loading direction reach up to about −115 (compressive) and 832 (tensile) MPa, respectively. A notable dislocation annihilation phenomenon is observed in the Al matrix: the dislocation density decreases significantly during unloading stages, and the amplitude of this reduction increases after experiencing a larger plastic deformation. At the macroscale, this dislocation annihilation phenomenon is associated with the reverse strain after unloading. At the microscale, the annihilation phenomenon is driven by the compressive residual stress in the Al matrix. Meanwhile, the annihilation of screw dislocations during unloading stages contributes to the reduction in total dislocation density.http://www.sciencedirect.com/science/article/pii/S0264127520308753Aluminum alloyAdditive manufacturingLaser powder bed fusion (LPBF)Neutron diffractionResidual stressDislocation density |
| spellingShingle | X.X. Zhang H. Andrä S. Harjo W. Gong T. Kawasaki A. Lutz M. Lahres Quantifying internal strains, stresses, and dislocation density in additively manufactured AlSi10Mg during loading-unloading-reloading deformation Materials & Design Aluminum alloy Additive manufacturing Laser powder bed fusion (LPBF) Neutron diffraction Residual stress Dislocation density |
| title | Quantifying internal strains, stresses, and dislocation density in additively manufactured AlSi10Mg during loading-unloading-reloading deformation |
| title_full | Quantifying internal strains, stresses, and dislocation density in additively manufactured AlSi10Mg during loading-unloading-reloading deformation |
| title_fullStr | Quantifying internal strains, stresses, and dislocation density in additively manufactured AlSi10Mg during loading-unloading-reloading deformation |
| title_full_unstemmed | Quantifying internal strains, stresses, and dislocation density in additively manufactured AlSi10Mg during loading-unloading-reloading deformation |
| title_short | Quantifying internal strains, stresses, and dislocation density in additively manufactured AlSi10Mg during loading-unloading-reloading deformation |
| title_sort | quantifying internal strains stresses and dislocation density in additively manufactured alsi10mg during loading unloading reloading deformation |
| topic | Aluminum alloy Additive manufacturing Laser powder bed fusion (LPBF) Neutron diffraction Residual stress Dislocation density |
| url | http://www.sciencedirect.com/science/article/pii/S0264127520308753 |
| work_keys_str_mv | AT xxzhang quantifyinginternalstrainsstressesanddislocationdensityinadditivelymanufacturedalsi10mgduringloadingunloadingreloadingdeformation AT handra quantifyinginternalstrainsstressesanddislocationdensityinadditivelymanufacturedalsi10mgduringloadingunloadingreloadingdeformation AT sharjo quantifyinginternalstrainsstressesanddislocationdensityinadditivelymanufacturedalsi10mgduringloadingunloadingreloadingdeformation AT wgong quantifyinginternalstrainsstressesanddislocationdensityinadditivelymanufacturedalsi10mgduringloadingunloadingreloadingdeformation AT tkawasaki quantifyinginternalstrainsstressesanddislocationdensityinadditivelymanufacturedalsi10mgduringloadingunloadingreloadingdeformation AT alutz quantifyinginternalstrainsstressesanddislocationdensityinadditivelymanufacturedalsi10mgduringloadingunloadingreloadingdeformation AT mlahres quantifyinginternalstrainsstressesanddislocationdensityinadditivelymanufacturedalsi10mgduringloadingunloadingreloadingdeformation |