Influence of Si precipitates on fracture mechanisms of AlSi10Mg parts processed by Selective Laser Melting

Delahaye, Jocelyn; Tchuindjang, Jérôme Tchoufack; Lecomte-Beckers, Jacqueline; Rigo, Olivier; Habraken, Anne; Mertens, Anne

doi:10.1016/j.actamat.2019.06.013

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Influence of Si precipitates on fracture mechanisms of AlSi10Mg parts processed by Selective Laser Melting

Delahaye, Jocelyn; Tchuindjang, Jérôme Tchoufack; Lecomte-Beckers, Jacqueline et al.

2019 • In Acta Materialia, 175, p. 160-170

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https://hdl.handle.net/2268/236982

DOI
10.1016/j.actamat.2019.06.013

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Keywords :

Aluminium alloys; Selective Laser Melting; Coarsening; Fracture; Nanoindentation

Abstract :

[en] While it is generally accepted that the rupture of SLM AlSi10Mg tensile specimens occurs at the melt pool boundary, the exact zone and microstructural features responsible for the rupture have not been clearly identified. In this study, the microstructures and local mechanical properties at the melt pool boundary are thus analyzed in details. The Si phase fraction and the Si precipitate spacing are measured by image analysis and SEM-EDS analysis. Hardness tests are performed by nanoindentation. Fracture features are observed on broken samples. It is found that the Heat Affected Zone (HAZ) exhibits low hardness due to coarse non-coherent Si precipitates. Void nucleation occurs at the interface between the coarse Si precipitates and the Al matrix by dislocations piling up. For that reason, the HAZ is found to be the preferential region where fracture is likely to occur. This analysis is confirmed by the matching of Si precipitate spacing within the HAZ with dimple spacing observed in fracture surfaces. Moreover, a simple analytical approach of the thermal history during manufacturing, using Rosenthal’s equation, allows elucidating the mechanisms by which the processing conditions affect the fracture behavior.

Disciplines :

Materials science & engineering

Author, co-author :

Delahaye, Jocelyn ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques

Tchuindjang, Jérôme Tchoufack ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques

Lecomte-Beckers, Jacqueline ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques

Rigo, Olivier; Sirris Research Centre

Habraken, Anne ; Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo

Mertens, Anne ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Science des matériaux métalliques

Language :

English

Title :

Influence of Si precipitates on fracture mechanisms of AlSi10Mg parts processed by Selective Laser Melting

Publication date :

15 August 2019

Journal title :

Acta Materialia

ISSN :

1359-6454

eISSN :

1873-2453

Publisher :

Elsevier, Netherlands

Volume :

175

Pages :

160-170

Peer reviewed :

Peer Reviewed verified by ORBi

Name of the research project :

Iawatha

Funders :

FEDER - Fonds Européen de Développement Régional
F.R.S.-FNRS - Fonds de la Recherche Scientifique

Available on ORBi :

since 18 June 2019

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