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Aluminium-26 grain boundary diffusion in pure and Y-doped polycrystalline a-alumina

Fielitz, Peter and Kelm, Klemens and Bertram, Rainer and Chokshi, Atul H. and Borchardt, Günther (2017) Aluminium-26 grain boundary diffusion in pure and Y-doped polycrystalline a-alumina. Acta Materialia, 127, pp. 302-311. Elsevier. doi: 10.1016/j.actamat.2017.01.005. ISSN 1359-6454.

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Official URL: http://www.sciencedirect.com/science/article/pii/S1359645417300058?via%3Dihub


Aluminium grain boundary diffusivities were measured in pure and Y-doped polycrystalline a-Al2O3 using the artificial aluminium isotope 26Al as a tracer. An advanced preparation technique for the 26Al tracer source enabled secondary ion mass spectrometry (SIMS) measurements to analyse the 26Al depth distributions in the polycrystalline materials. Simultaneously performed 18O and 26Al tracer diffusion experiments demonstrated clearly in the most direct way that 26Al grain boundary diffusion is significantly faster than 18O grain boundary diffusion. There was no significant difference in aluminium grain boundary diffusivities in pure and Y-doped polycrystalline a-Al2O3. The experimental results of this work imply that diffusion creep in alumina is unlikely to be controlled by Al grain boundary diffusion.

Item URL in elib:https://elib.dlr.de/114453/
Document Type:Article
Title:Aluminium-26 grain boundary diffusion in pure and Y-doped polycrystalline a-alumina
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Fielitz, Peterpeter.fielitz (at) tu-clausthal.deUNSPECIFIED
Kelm, KlemensKlemens.Kelm (at) dlr.deUNSPECIFIED
Bertram, RainerLeibniz-Institut für Kristallzüchtung, BerlinUNSPECIFIED
Chokshi, Atul H.Department of Materials Engineering, Indian Institute of Science, Bangalore, IndiaUNSPECIFIED
Borchardt, Güntherinstitut für metallurgie, technische universität clausthal, clausthal-zellerfeldUNSPECIFIED
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.actamat.2017.01.005
Page Range:pp. 302-311
Keywords:Polycrystalline a-alumina Pure Y-doped Aluminium-26 Grain boundary tracer diffusion SIMS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Combustion Chamber Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Deposited By: Kelm, Dr. Klemens
Deposited On:10 Oct 2017 10:00
Last Modified:23 Jul 2022 13:44

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