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Rupture of intermetallic networks and strain localization in cast AlSi12Ni alloy: 2D and 3D characterization

Tireira, Aly and Requena, Guillermo and Sao Jao, S and Borbely, Andras and Klocker, Helmut (2016) Rupture of intermetallic networks and strain localization in cast AlSi12Ni alloy: 2D and 3D characterization. Acta Materialia, 112, pp. 162-170. Elsevier. DOI: http://dx.doi.org/10.1016/j.actamat.2016.04.020 ISSN 1359-6454

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Abstract

Damage development during tensile straining of a cast AlSi12Ni alloy has been characterized by in situ SEM imaging and synchrotron X-ray microtomography. Two main damage mechanisms consisting of intermetallic particle rupture and decohesion of Al-Si interfaces were revealed. Particle rupture takes place already from the beginning of the deformation, while decohesion of Al-Si interfaces is more characteristic at later stages. It is shown that damage evolution in the alloy is closely related to the underlying geometry of the intermetallic phase, its clustered structure playing a double role in Controlling strain localization in the matrix as well as the rupture sequence of the intermetallic phase itself. The latter shows that small clusters break-off from the complex intermetallic network before large clusters, in good agreement with their load carrying capacity determined by the local volume fraction of the intermetallic phase. Finite element modeling of the alloy's tensile behavior evidences that Deformation bands formed in the alloy with complex structure are similar to those developed in a model particle reinforced metal-matrix composite, where the particles correspond to the clustered regions of the intermetallic phase.

Item URL in elib:https://elib.dlr.de/108460/
Document Type:Article
Title:Rupture of intermetallic networks and strain localization in cast AlSi12Ni alloy: 2D and 3D characterization
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Tireira, AlyUNSPECIFIEDUNSPECIFIED
Requena, GuillermodlrUNSPECIFIED
Sao Jao, SUNSPECIFIEDUNSPECIFIED
Borbely, AndrasUNSPECIFIEDUNSPECIFIED
Klocker, HelmutUNSPECIFIEDUNSPECIFIED
Date:2016
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:112
DOI :http://dx.doi.org/10.1016/j.actamat.2016.04.020
Page Range:pp. 162-170
Publisher:Elsevier
ISSN:1359-6454
Status:Published
Keywords:Aluminum alloys Microtomography Damage Cluster analysis Strain localization
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: Requena, Guillermo
Deposited On:29 Nov 2016 14:59
Last Modified:29 Nov 2016 14:59

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