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The crystalline-to-amorphous transition in shock-loaded mullite Al2VI(Al2+2x Si2-2x)IVO10-x in the light of shear modulus anisotropy

Braue, Wolfgang and Hildmann, Bernd and Schneider, Hartmut and Hornemann, Ulrich (2009) The crystalline-to-amorphous transition in shock-loaded mullite Al2VI(Al2+2x Si2-2x)IVO10-x in the light of shear modulus anisotropy. Journal of the European Ceramic Society, 29, pp. 3135-3146. Elsevier. DOI: 10.1016/jeurceramsoc.2009.05.051

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Official URL: http://www.elsevier.com/locate/jeurceramsoc

Abstract

We present experimental evidence for shock-wave induced amorphization in polycrystalline and single crystal mullite, Al2VI(Al2+2x Si2-2x)IVO10-x, at peak pressures above 35 GPa . The transition proceeds along a network of very thin glass lamellae (“planar deformation features” (PDFs)) of mullite-normative composition extending parallel to low-index crystallographic planes including {120}, {230} and {110}. Cumulative microstructural evidence from the PDFs derived via analytical transmission electron microscopy suggests a shear-induced for-mation mechanism. Experimental PDFs match the relative minima of the calculated represen-tation surfaces of the shear modulus suggesting that suitable PDF orientations can be derived from the elastic anisotropy of mullite. PDFs in mullite are in good agreement with those re-ported for naturally shocked sillimanite. Unlike the formation of shear-induced PDF-type glass lamellae in shocked mullite, the ther-mal decomposition of mullite following high post-shock temperatures results in a fine-grained phase assemblage consisting of corundum plus amorphous silica, and represents the most abundant transformation mechanism in the shock regime investigated (20-40 GPa). No stishovite was observed. At shock levels beyond 35 GPa thermal decomposition of mullite may occur along with PDFs within the same specimen.

Item URL in elib:https://elib.dlr.de/60221/
Document Type:Article
Title:The crystalline-to-amorphous transition in shock-loaded mullite Al2VI(Al2+2x Si2-2x)IVO10-x in the light of shear modulus anisotropy
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Braue, WolfgangDLRUNSPECIFIED
Hildmann, BerndDLRUNSPECIFIED
Schneider, HartmutUniversity of Cologne, Ibstitute of CrystallographyUNSPECIFIED
Hornemann, UlrichFhG, Ernst Mach Institut, Kandern UNSPECIFIED
Date:2009
Journal or Publication Title:Journal of the European Ceramic Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:29
DOI :10.1016/jeurceramsoc.2009.05.051
Page Range:pp. 3135-3146
Publisher:Elsevier
Status:Published
Keywords:Shock deformation, electron microscopy, plasticity, mullite, structural applications
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
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 > Structural and Functional Ceramics
Deposited By: Braue, Dr. Wolfgang
Deposited On:05 Nov 2009 16:11
Last Modified:26 Mar 2013 13:12

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