Nanoscale periodic gradients generated by laser powder bed fusion of an AlSi10Mg alloy
In this study, the formation of a periodic microstructural pattern designed by laser powder bed fusion (LPBF), commonly called selective laser melting (SLM), of an AlSi10Mg alloy is revealed at high resolution using scanning transmission electron microscopy and atom probe tomography. Special attenti...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-01-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127520307991 |
| _version_ | 1818930045231562752 |
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| author | Williams Lefebvre Grégory Rose Pauline Delroisse Eric Baustert Fabien Cuvilly Aude Simar |
| author_facet | Williams Lefebvre Grégory Rose Pauline Delroisse Eric Baustert Fabien Cuvilly Aude Simar |
| author_sort | Williams Lefebvre |
| collection | DOAJ |
| description | In this study, the formation of a periodic microstructural pattern designed by laser powder bed fusion (LPBF), commonly called selective laser melting (SLM), of an AlSi10Mg alloy is revealed at high resolution using scanning transmission electron microscopy and atom probe tomography. Special attention is paid to the description of non-equilibrium structures and compositional fields resulting from the ultrafast cooling of the LPBF process. Observations reveal the existence of a glass state in eutectic areas, wherein short-range ordering of the diamond-Si structure is observed. The apparent very fast solidification of eutectic regions is found to involve a local strain in adjacent Al cells, which extends up to 100 nm on average. In the supersaturated aluminium solid solution retained by the LPBF process, two populations of clusters are identified, for which the potential role of the selection of hardening phases is discussed. It is proposed that the microstructure of former melt pools outside heat-affected areas is described by the repetition of a periodic microstructural pattern consisting of eutectic regions /strain-hardened Al-crystals /strain-free Al-crystals with a high density of solute-rich clusters. |
| first_indexed | 2024-12-20T03:54:27Z |
| format | Article |
| id | doaj.art-690171609ce94801ba292aeb25870b4a |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-20T03:54:27Z |
| publishDate | 2021-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-690171609ce94801ba292aeb25870b4a2022-12-21T19:54:22ZengElsevierMaterials & Design0264-12752021-01-01197109264Nanoscale periodic gradients generated by laser powder bed fusion of an AlSi10Mg alloyWilliams Lefebvre0Grégory Rose1Pauline Delroisse2Eric Baustert3Fabien Cuvilly4Aude Simar5Normandie University, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France; Corresponding author.Normandie University, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France; Volum-e, 1 chemin de la fonderie, 76340 Blangy-sur-Bresle, FranceInstitute of Mechanics, Materials and Civil Engineering, UCLouvain, Louvain-la-Neuve, BelgiumVolum-e, 1 chemin de la fonderie, 76340 Blangy-sur-Bresle, FranceNormandie University, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, FranceInstitute of Mechanics, Materials and Civil Engineering, UCLouvain, Louvain-la-Neuve, BelgiumIn this study, the formation of a periodic microstructural pattern designed by laser powder bed fusion (LPBF), commonly called selective laser melting (SLM), of an AlSi10Mg alloy is revealed at high resolution using scanning transmission electron microscopy and atom probe tomography. Special attention is paid to the description of non-equilibrium structures and compositional fields resulting from the ultrafast cooling of the LPBF process. Observations reveal the existence of a glass state in eutectic areas, wherein short-range ordering of the diamond-Si structure is observed. The apparent very fast solidification of eutectic regions is found to involve a local strain in adjacent Al cells, which extends up to 100 nm on average. In the supersaturated aluminium solid solution retained by the LPBF process, two populations of clusters are identified, for which the potential role of the selection of hardening phases is discussed. It is proposed that the microstructure of former melt pools outside heat-affected areas is described by the repetition of a periodic microstructural pattern consisting of eutectic regions /strain-hardened Al-crystals /strain-free Al-crystals with a high density of solute-rich clusters.http://www.sciencedirect.com/science/article/pii/S0264127520307991Laser powder bed fusionSLMLPBFSelective laser meltingAdditive manufacturing powder bed fusionDesign |
| spellingShingle | Williams Lefebvre Grégory Rose Pauline Delroisse Eric Baustert Fabien Cuvilly Aude Simar Nanoscale periodic gradients generated by laser powder bed fusion of an AlSi10Mg alloy Materials & Design Laser powder bed fusion SLM LPBF Selective laser melting Additive manufacturing powder bed fusion Design |
| title | Nanoscale periodic gradients generated by laser powder bed fusion of an AlSi10Mg alloy |
| title_full | Nanoscale periodic gradients generated by laser powder bed fusion of an AlSi10Mg alloy |
| title_fullStr | Nanoscale periodic gradients generated by laser powder bed fusion of an AlSi10Mg alloy |
| title_full_unstemmed | Nanoscale periodic gradients generated by laser powder bed fusion of an AlSi10Mg alloy |
| title_short | Nanoscale periodic gradients generated by laser powder bed fusion of an AlSi10Mg alloy |
| title_sort | nanoscale periodic gradients generated by laser powder bed fusion of an alsi10mg alloy |
| topic | Laser powder bed fusion SLM LPBF Selective laser melting Additive manufacturing powder bed fusion Design |
| url | http://www.sciencedirect.com/science/article/pii/S0264127520307991 |
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