Defect formation by order coalescence in vermicular grains during alumina phase transformation
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
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.
Defects, Phase transformation, Alumina, Oriented coalescence (OC)
Nano Technology Materials Engineering
IdentifiersURN: urn:nbn:se:su:diva-120167DOI: 10.1016/j.scriptamat.2015.05.020ISI: 000358806400015OAI: oai:DiVA.org:su-120167DiVA: diva2:851804