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Revealing the Effect of Local Connectivity of Rigid Phases during Deformation at High Temperature of Cast AlSi12Cu4Ni(2,3)Mg Alloys

Bugelnig, Katrin and Germann, Holger and Steffens, Thomas and Sket, Federico and Adrien, Jerome and Maire, Eiric and Boller, Elodie and Requena, Guillermo (2018) Revealing the Effect of Local Connectivity of Rigid Phases during Deformation at High Temperature of Cast AlSi12Cu4Ni(2,3)Mg Alloys. Materials (11), pp. 1-18. Multidisciplinary Digital Publishing Institute (MDPI). DOI: doi:10.3390/ma11081300 ISSN 1996-1944

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Official URL: http://www.mdpi.com/journal/materials

Abstract

The 3D microstructure and its effect on damage formation and accumulation during tensile deformation at 300 °C for cast, near eutectic AlSi12Cu4Ni2Mg and AlSi12Cu4Ni3Mg alloys has been investigated using in-situ synchrotron micro-tomography, complemented by conventional 2D characterization methods. An increase of Ni from 2 to 3 wt.% leads to a higher local connectivity, quantified by the Euler number χ, at constant global interconnectivity of rigid 3D networks formed by primary and eutectic Si and intermetallics owing to the formation of the plate-like Al-Ni-Cu-rich δ-phase. Damage initiates as micro-cracks through primary Si particles agglomerated in clusters and as voids at matrix/rigid phase interfaces. Coalescence of voids leads to final fracture with the main crack propagating along damaged rigid particles as well as through the matrix. The lower local connectivity of the rigid 3D network in the alloy with 2 wt.% Ni permits localized plastification of the matrix and helps accommodating more damage resulting in an increase of ductility with respect to AlSi12Cu4Ni3Mg. A simple load partition approach that considers the evolution of local connectivity of rigid networks as a function of strain is proposed based on in-situ experimental data.

Item URL in elib:https://elib.dlr.de/122712/
Document Type:Article
Title:Revealing the Effect of Local Connectivity of Rigid Phases during Deformation at High Temperature of Cast AlSi12Cu4Ni(2,3)Mg Alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bugelnig, KatrinKatrin.Bugelnig (at) dlr.deUNSPECIFIED
Germann, HolgerKS KolbenschmidtUNSPECIFIED
Steffens, ThomasKS KolbenschmidtUNSPECIFIED
Sket, FedericoIMDEA Materials InstituteUNSPECIFIED
Adrien, JeromeINSA LyonUNSPECIFIED
Maire, EiricINSA LyonUNSPECIFIED
Boller, ElodieesrfUNSPECIFIED
Requena, GuillermoGuillermo.Requena (at) dlr.deUNSPECIFIED
Date:August 2018
Journal or Publication Title:Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :doi:10.3390/ma11081300
Page Range:pp. 1-18
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:1996-1944
Status:Published
Keywords:Cast Al-Si alloys; 3D characterization; synchrotron tomography; in-situ tensile deformation; 3D microstructure; damage; strength; connectivity
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Bugelnig, Katrin
Deposited On:09 Nov 2018 11:43
Last Modified:14 Dec 2019 04:25

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