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Microstructure and high-temperature deformation behavior of Al2O3–TiO2 obtained from ultra-high-pressure densification of metastable powders

Suffner, J. ; Scherer, T. ; Wang, D. ; Fasel, C. ; Jaworska, L. ; Hahn, H. (2011)
Microstructure and high-temperature deformation behavior of Al2O3–TiO2 obtained from ultra-high-pressure densification of metastable powders.
In: Acta Materialia, 59 (20)
doi: 10.1016/j.actamat.2011.09.025
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Metastable alumina composite powders with 13 wt.% titania were produced by plasma spraying using liquid nitrogen quenched substrates. The material consisted of a mixture of Al2O3 in a distorted spinel structure and a large amount of amorphous phases. High-pressure–high-temperature sintering below the crystallization temperature of the amorphous phase yielded a crystalline/amorphous composite that was used for creep experiments. During heating to the desired testing temperature, crystallization occurred and an in situ composite composed of corundum and rutile was obtained. This material exhibited superior deformation behavior compared to conventionally processed alumina materials. Comparably low temperatures of 1100 °C could be utilized to achieve plastic deformation of the material under a pressure of 50 MPa. Coble grain boundary creep with n = 1 and a low activation energy for diffusion of 390 kJ mol−1 was assumed to be the deformation mechanism.

Typ des Eintrags: Artikel
Erschienen: 2011
Autor(en): Suffner, J. ; Scherer, T. ; Wang, D. ; Fasel, C. ; Jaworska, L. ; Hahn, H.
Art des Eintrags: Bibliographie
Titel: Microstructure and high-temperature deformation behavior of Al2O3–TiO2 obtained from ultra-high-pressure densification of metastable powders
Sprache: Englisch
Publikationsjahr: Dezember 2011
Verlag: Elsevier Science Publishing Company
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Acta Materialia
Jahrgang/Volume einer Zeitschrift: 59
(Heft-)Nummer: 20
DOI: 10.1016/j.actamat.2011.09.025
Kurzbeschreibung (Abstract):

Metastable alumina composite powders with 13 wt.% titania were produced by plasma spraying using liquid nitrogen quenched substrates. The material consisted of a mixture of Al2O3 in a distorted spinel structure and a large amount of amorphous phases. High-pressure–high-temperature sintering below the crystallization temperature of the amorphous phase yielded a crystalline/amorphous composite that was used for creep experiments. During heating to the desired testing temperature, crystallization occurred and an in situ composite composed of corundum and rutile was obtained. This material exhibited superior deformation behavior compared to conventionally processed alumina materials. Comparably low temperatures of 1100 °C could be utilized to achieve plastic deformation of the material under a pressure of 50 MPa. Coble grain boundary creep with n = 1 and a low activation energy for diffusion of 390 kJ mol−1 was assumed to be the deformation mechanism.

Freie Schlagworte: Sintering, Nanocomposite, Superplasticity, Ceramics, Crystallization
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 19 Feb 2013 09:56
Letzte Änderung: 05 Mär 2013 10:05
PPN:
Sponsoren: Supported by the EU within the 6th framework program STRP NMP3-CT-2004-001470 NAMAMET (NAnostructured Materials through Metastable Transformations)., Financial support by the state of Hessen is gratefully acknowledged.
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