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Separating macrostresses from microstresses in Al2O3-15 vol%SiC particulate reinforced composites
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Xi'an University of Architecture & Technology, China.
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Number of Authors: 5
2015 (English)In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 109, 84-88 p.Article in journal (Refereed) Published
Abstract [en]

Macrostresses and microstresses coexist in ceramics, but are difficult to distinguish. In this work, these two types of residual stresses were separated by comparing the stress levels on the mechanically and argon beam polished surfaces of Al2O3-15 vol%SiC particulate reinforced composites. Stresses were measured using the shift of a Raman peak of beta-sic, the shift of a luminescence line of alpha-Al2O3 and a self-consistent approach. The critical grain size of SiC, over which will result in the crack formation in Al2O3 matrix, was calculated to be 13.5-26.4 mu m. New microcracldng did not form in Al2O3 grains during progressive mechanical polishing.

Place, publisher, year, edition, pages
2015. Vol. 109, 84-88 p.
Keyword [en]
Particulate reinforced composites, Residual stresses, Spark plasma sintering, Raman spectroscopy, Argon ion beam polishing
National Category
Chemical Sciences Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-121855DOI: 10.1016/j.scriptamat.2015.07.026ISI: 000361078100020OAI: oai:DiVA.org:su-121855DiVA: diva2:864233
Available from: 2015-10-26 Created: 2015-10-19 Last updated: 2017-12-01Bibliographically approved

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