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In-situ determination of the influence of composition on the damage accumulation of Al-Si piston alloys

Bugelnig, Katrin and Sket, Federico and Germann, Holger and Steffens, Thomas and Wilde, Fabian and Boller, Elodie and Requena, Guillermo (2018) In-situ determination of the influence of composition on the damage accumulation of Al-Si piston alloys. 16th Conference on Aluminum Alloys, 17.-21. Jun. 2018, Montreal, Kanada. (Unpublished)

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Abstract

Cast near eutectic Al-Si alloys are used in automotive pistons due to their high strength-to-weight ratio as well as excellent castability and heat conductivity. Particularly, the piston bowl rim in modern diesel engines must be able to withstand compressive and tensile stresses at temperatures up to 400°C. The microstructure of cast near eutectic Al-Si piston alloys consists of interconnected 3D hybrid networks formed by Si (primary and eutectic) and intermetallic phases embedded in a comparatively soft α-Al matrix. The load carrying capability of these networks is affected by topological and morphological changes that they can undergo during thermal heat treatments and due to the thermo-mechanical conditions during service. The damage formation and evolution of different cast, near eutectic Al-Si piston alloys during tensile deformation was investigated as a function of chemical composition and test-temperature by means of in-situ synchrotron microtomography. A clear influence of the test-temperature on damage mechanisms und tensile behaviour was determined. Furthermore, a correlation between load carrying capability and local connectedness of the rigid phase network owing to variations in chemical composition was established.

Item URL in elib:https://elib.dlr.de/122708/
Document Type:Conference or Workshop Item (Speech)
Title:In-situ determination of the influence of composition on the damage accumulation of Al-Si piston alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bugelnig, KatrinKatrin.Bugelnig (at) dlr.deUNSPECIFIED
Sket, FedericoIMDEA Materials InstituteUNSPECIFIED
Germann, HolgerKS KolbenschmidtUNSPECIFIED
Steffens, ThomasKS KolbenschmidtUNSPECIFIED
Wilde, FabianDESYUNSPECIFIED
Boller, ElodieesrfUNSPECIFIED
Requena, GuillermoGuillermo.Requena (at) dlr.deUNSPECIFIED
Date:20 June 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:Cast Al-Si alloys; 3D characterization; synchrotron tomography; in-situ tensile deformation; 3D microstructure; damage; strength; connectivity
Event Title:16th Conference on Aluminum Alloys
Event Location:Montreal, Kanada
Event Type:international Conference
Event Dates:17.-21. Jun. 2018
Organizer:MetSoc
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:08 Nov 2018 10:48
Last Modified:20 Nov 2018 09:33

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