Influence of Microstructure on Fracture Mechanisms of the Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion
Few systematic studies on the correlation between alloy microstructure and mechanical failure of the AlSi10Mg alloy produced by laser-based powder bed fusion (L-PBF) are available in the literature. This work investigates the fracture mechanisms of the L-PBF AlSi10Mg alloy in as-built (AB) condition...
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| Online Access: | https://www.mdpi.com/1996-1944/16/5/2006 |
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| author | Gianluca Di Egidio Carla Martini Johan Börjesson Ehsan Ghassemali Lorella Ceschini Alessandro Morri |
| author_facet | Gianluca Di Egidio Carla Martini Johan Börjesson Ehsan Ghassemali Lorella Ceschini Alessandro Morri |
| author_sort | Gianluca Di Egidio |
| collection | DOAJ |
| description | Few systematic studies on the correlation between alloy microstructure and mechanical failure of the AlSi10Mg alloy produced by laser-based powder bed fusion (L-PBF) are available in the literature. This work investigates the fracture mechanisms of the L-PBF AlSi10Mg alloy in as-built (AB) condition and after three different heat treatments (T5 (4 h at 160 °C), standard T6 (T6B) (1 h at 540 °C followed by 4 h at 160 °C), and rapid T6 (T6R) (10 min at 510 °C followed by 6 h at 160 °C)). In-situ tensile tests were conducted with scanning electron microscopy combined with electron backscattering diffraction. In all samples the crack nucleation was at defects. In AB and T5, the interconnected Si network fostered damage at low strain due to the formation of voids and the fragmentation of the Si phase. T6 heat treatment (T6B and T6R) formed a discrete globular Si morphology with less stress concentration, which delayed the void nucleation and growth in the Al matrix. The analysis empirically confirmed the higher ductility of the T6 microstructure than that of the AB and T5, highlighting the positive effects on the mechanical performance of the more homogeneous distribution of finer Si particles in T6R. |
| first_indexed | 2024-03-11T07:18:29Z |
| format | Article |
| id | doaj.art-520a9accd68d4cddaff9f9416982bfaa |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T07:18:29Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-520a9accd68d4cddaff9f9416982bfaa2023-11-17T08:05:58ZengMDPI AGMaterials1996-19442023-02-01165200610.3390/ma16052006Influence of Microstructure on Fracture Mechanisms of the Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed FusionGianluca Di Egidio0Carla Martini1Johan Börjesson2Ehsan Ghassemali3Lorella Ceschini4Alessandro Morri5Department of Industrial Engineering (DIN), Alma Mater Studiorum, University of Bologna, Viale del Risorgimento 4, 40136 Bologna, ItalyDepartment of Industrial Engineering (DIN), Alma Mater Studiorum, University of Bologna, Viale del Risorgimento 4, 40136 Bologna, ItalyDepartment of Materials and Manufacturing, School of Engineering, Jönköping University, SE-551 11 Jönköping, SwedenDepartment of Materials and Manufacturing, School of Engineering, Jönköping University, SE-551 11 Jönköping, SwedenDepartment of Industrial Engineering (DIN), Alma Mater Studiorum, University of Bologna, Viale del Risorgimento 4, 40136 Bologna, ItalyDepartment of Industrial Engineering (DIN), Alma Mater Studiorum, University of Bologna, Viale del Risorgimento 4, 40136 Bologna, ItalyFew systematic studies on the correlation between alloy microstructure and mechanical failure of the AlSi10Mg alloy produced by laser-based powder bed fusion (L-PBF) are available in the literature. This work investigates the fracture mechanisms of the L-PBF AlSi10Mg alloy in as-built (AB) condition and after three different heat treatments (T5 (4 h at 160 °C), standard T6 (T6B) (1 h at 540 °C followed by 4 h at 160 °C), and rapid T6 (T6R) (10 min at 510 °C followed by 6 h at 160 °C)). In-situ tensile tests were conducted with scanning electron microscopy combined with electron backscattering diffraction. In all samples the crack nucleation was at defects. In AB and T5, the interconnected Si network fostered damage at low strain due to the formation of voids and the fragmentation of the Si phase. T6 heat treatment (T6B and T6R) formed a discrete globular Si morphology with less stress concentration, which delayed the void nucleation and growth in the Al matrix. The analysis empirically confirmed the higher ductility of the T6 microstructure than that of the AB and T5, highlighting the positive effects on the mechanical performance of the more homogeneous distribution of finer Si particles in T6R.https://www.mdpi.com/1996-1944/16/5/2006laser-based powder bed fusion (L-PBF)AlSi10Mgin-situ tensile testheat treatmentfracture mechanisms |
| spellingShingle | Gianluca Di Egidio Carla Martini Johan Börjesson Ehsan Ghassemali Lorella Ceschini Alessandro Morri Influence of Microstructure on Fracture Mechanisms of the Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion Materials laser-based powder bed fusion (L-PBF) AlSi10Mg in-situ tensile test heat treatment fracture mechanisms |
| title | Influence of Microstructure on Fracture Mechanisms of the Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion |
| title_full | Influence of Microstructure on Fracture Mechanisms of the Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion |
| title_fullStr | Influence of Microstructure on Fracture Mechanisms of the Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion |
| title_full_unstemmed | Influence of Microstructure on Fracture Mechanisms of the Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion |
| title_short | Influence of Microstructure on Fracture Mechanisms of the Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion |
| title_sort | influence of microstructure on fracture mechanisms of the heat treated alsi10mg alloy produced by laser based powder bed fusion |
| topic | laser-based powder bed fusion (L-PBF) AlSi10Mg in-situ tensile test heat treatment fracture mechanisms |
| url | https://www.mdpi.com/1996-1944/16/5/2006 |
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