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Influence of Microstructure on Fracture Mechanisms of the Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion
Department of Industrial Engineering (DIN), Alma Mater Studiorum, University of Bologna, Viale del Risorgimento 4, Bologna, 40136, Italy.
Department of Industrial Engineering (DIN), Alma Mater Studiorum, University of Bologna, Viale del Risorgimento 4, Bologna, 40136, Italy.
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-6584-5907
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-7527-719X
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2023 (English)In: Materials, E-ISSN 1996-1944, Vol. 16, no 5, article id 2006Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
MDPI, 2023. Vol. 16, no 5, article id 2006
Keywords [en]
Backscattering, Fracture, Heat treatment, Microstructure, Morphology, Nucleation, Silicon, Tensile strength, Tensile testing, Alloy microstructure, Condition, Electron backscattering, Fracture mechanisms, In-situ tensile test, Laser-based, Laser-based powder bed fusion, Mechanical failures, Powder bed, Systematic study, Scanning electron microscopy, AlSi10Mg, laser-based powder bed fusion (L-PBF)
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Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-60030DOI: 10.3390/ma16052006ISI: 000948281900001Scopus ID: 2-s2.0-85149850554Local ID: GOA;intsam;868742OAI: oai:DiVA.org:hj-60030DiVA, id: diva2:1746127
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European Commission, CN00000023Available from: 2023-03-27 Created: 2023-03-27 Last updated: 2024-07-04Bibliographically approved

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Börjesson, JohanGhassemali, Ehsan

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