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Defect formation by order coalescence in vermicular grains during alumina phase transformation
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 6
2015 (English)In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 107, 59-62 p.Article in journal (Refereed) Published
Abstract [en]

Vermicular alpha-Al2O3 grains obtained from gamma- to alpha-phase transformation were investigated. X-ray diffraction patterns showed a left-shifting shoulder in all diffraction peaks of transformed alpha-Al2O3. High-resolution transmission electron microscopy results confirmed large amounts of defects inside the vermicular alpha-Al2O3 single-crystal. Combined with grain-growth discontinuity, the authors proposed that the defects inside vermicular grains resulted from assembly of nanosized alpha-crystallites by an ordered coalescence mechanism directly after phase transformation, by which the orientation alignment was thermodynamically favored in the solid-state sintering.

Place, publisher, year, edition, pages
2015. Vol. 107, 59-62 p.
Keyword [en]
Defects, Phase transformation, Alumina, Oriented coalescence (OC)
National Category
Nano Technology Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-120167DOI: 10.1016/j.scriptamat.2015.05.020ISI: 000358806400015OAI: oai:DiVA.org:su-120167DiVA: diva2:851804
Available from: 2015-09-07 Created: 2015-09-02 Last updated: 2017-12-04Bibliographically approved

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